Calciverse — Powerful Online Calculators & Tools

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From Unit

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Formula—

Quick Reference — Common Conversions

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Calculators

Use these tools for math, money, health, and everyday life. Math covers basic and scientific calculator, percentage, average, fraction, statistics, probability, number tools, geometry, and algebra. Finance includes tip, loan, and mortgage. Business has ROI and break-even. Investing & Trading and Real Estate link to investment and property calculators. Architecture, Construction, HVAC, and Plumbing offer trade and building calculators. Health covers BMI, BMR, calorie, fitness, pregnancy, and lifestyle. Tools & Daily includes date & time, travel, outdoors, kitchen, school, size converters, and random generators. Energy, Solar, Electrical, Mechanical, and Science & Engineering cover power, solar, and technical calculations. Search or pick a category below to start.

Tools by category

Math

CalculatorBasic arithmetic • send result to unit converterBasic, Scientific PercentagePercent of, percent change, percent differencePercent of, Percent change, Percent difference AverageMean, median, mode FractionAdd, subtract, multiply, divide, simplifyAdd, Subtract, Multiply, Divide, Simplify StatisticsMean, median, mode, range, variance, std devMean, Median, Mode, Range, Variance, Std dev ProbabilitySingle and two eventsSingle event, Two events, Series

Finance

Tip CalculatorTip and total from amount Loan & MortgagePayment, amortization, payoffPayment, Amortization, Payoff

Retirement & Financial Planning

Retirement Master PlannerRetirement readiness and savings goals

Business

ROIReturn on investment Break-EvenBreak-even analysis

Investing & Trading

Investment CalculatorLump sum, monthly contribution, goal

Real Estate

Deal Finder ModeReal estate deal screening Rental Property CalculatorRental income and expenses

Science & Engineering

Area & VolumeGeometric area and volume by shape

Health

BMI & BMRBody mass index and basal metabolic rate

Investing & Trading

Use these tools for portfolio growth and active trading. Portfolio & Growth covers investment calculator, dollar cost average, portfolio allocation, TVM, ROI, investment return, dividend income, and portfolio performance. Trading Tools helps with position size, risk-reward, trade risk, options profit, P&L, leverage, margin, liquidation price, drawdown, and crypto/currency profit. Journal & Projects includes trade journal summary and projects & playbooks. Search or pick a category below to start.

Tools by category

Calculator

Basic arithmetic • send result to unit converter

History

No calculations yet

Scientific Calculator

Trig, logarithms, powers, constants

Scientific mode is available inside the Calculator. Toggle it with the Scientific button above the keypad.

Time Zone Converter (Meeting Planner)

Convert a date/time between UTC offsets. Use Meeting Planner to see one time in multiple zones side‑by‑side.

Date & Time (local)

From UTC offset (hours)

To UTC offset (hours)

Result

—

Meeting Planner — same time in multiple zones

Meeting date & time

Meeting time is in (UTC offset)

Shoe Size Converter

Convert between US Men, EU, and UK sizes

Size

From

Result

—

Clothing Size Converter

Convert between US, EU, and UK clothing sizes

Size

From

Result

—

Ring Size Converter

Convert between US ring size and inner diameter (mm)

Value

From

US Inner diameter (mm)

Inner diameter (mm) US

Result

—

Bra Size Calculator

Band + bust measurement → US / UK cup and band size

Under bust / band (in)

Bust at fullest (in)

Percentage Calculator

Common phrases, percentage difference, and increase/decrease by percent.

What is X% of Y?

X (%)

Y (value)

Result

—

Formula: Result = (X/100) × Y

X is what % of Y?

Percentage

—

Formula: Result = (X / Y) × 100

Percentage Change (X → Y)

From (X)

To (Y)

Change

—

Type

—

Formula: Change % = ((Y − X) / X) × 100

X is Y% of what?

X (value)

Y (%)

Whole

—

Formula: Whole = X / (Y/100)

Percentage Difference

Value 1

Value 2

Difference

—

Increase or Decrease by Percent

Value

Percent (%)

Type

Increase Decrease

Result

—

Percent Error

Accepted (actual) value

Measured (observed) value

Percent Error

—

Formula: Percent Error = |measured − accepted| / |accepted| × 100

Fraction Calculator

Addition, subtraction, multiplication, division, simplification, and conversion between fractions and decimals.

Numerator 1

Denominator 1

Operation

Numerator 2

Denominator 2

Fraction

—

Decimal

—

Mixed Number

—

Statistics Calculator

Mean, median, mode, standard deviation & more

Numbers (comma or space separated)

Area & Volume

Geometric area and volume by shape. Real-time calculation.

Result

—

Surface Area

Surface area of sphere, cone, cube, cylinder, prism, capsule, cap, frustum, ellipsoid, pyramid. Same unit for all dimensions.

Shape

Formula

Surface Area

—

Average Calculator

Mean, weighted average, and rolling totals

Numbers (comma separated)

Random Number Generator

Generate random integers or decimals

Min

Max

Count

Type

Integer Decimal (2 places)

No Duplicates

No Yes

Generated Numbers

Random Name Generator

Generate random first names, last names, or full names

Type

Count

Random Color Generator

Generate random colors (HEX, RGB) with optional copy

Count

Lorem Ipsum Generator

Generate placeholder text — words, sentences, or paragraphs

Type

Count

Coin Flip

Flip a virtual coin — Heads or Tails

Flips

Dice Roller

Roll one or more dice (d4, d6, d8, d10, d12, d20)

Dice

Rolls

Random Card Generator

Draw one or more random playing cards

Count

No duplicates

Yes No

Random Letter Generator

Generate random letters (A–Z or a–z)

Case

Count

Random Country / City

Pick a random country or major city

Type

Count

Random Date Generator

Generate random dates within a range

From

Count

Spin the Wheel

Enter options (one per line), then spin to pick one at random

Options (one per line)

Baby Name Generator

Generate random baby names by style

Style

Count

Business Name Generator

Random business or brand name ideas

Count

Fantasy Name Generator

Generate names for characters, places, or creatures

Type

Count

Pet Name Generator

Cute and catchy names for dogs, cats, and other pets

Count

Random Username Generator

Generate unique usernames (adjective + noun + numbers)

Count

Include numbers

Yes No

Fake Credit Card Generator

Generate Luhn-valid test card numbers. For development/testing only; do not use for real payments.

Brand

Count

Carbon Footprint

Miles flown and car miles → rough CO₂ estimate

Miles flown (annual)

Car miles (annual)

Car efficiency (optional)

Weird Units Converter

Turn everyday values into fun equivalents: distances, weights, areas, volumes, speeds, and temperatures.

Quantity

Value

Unit

Love Calculator

Fun compatibility score based on two names (for entertainment only)

Your name

Their name

Golf Handicap Calculator

Course handicap from handicap index and slope rating (USGA-style)

Handicap Index

Slope Rating

Course Rating

Formula: Course Handicap = Index × (Slope/113) + (Course Rating − 72)

Wind Chill Calculator

Feels-like temperature from air temperature and wind speed (NWS formula)

Air temperature (°F)

Wind speed (mph)

Formula: NWS: 35.74 + 0.6215×T − 35.75×V^0.16 + 0.4275×T×V^0.16 (°F, mph)

Heat Index Calculator

Feels-like temperature from air temp and relative humidity (NWS)

Air temperature (°F)

Relative humidity (%)

Formula: Rothfusz regression (polynomial in temp °F and humidity %)

Dew Point Calculator

Dew point from temperature and relative humidity (Magnus formula)

Temperature (°F)

Relative humidity (%)

Formula: Magnus: γ = ln(RH/100) + (a×T)/(b+T); T_dp = (b×γ)/(a−γ); a=17.27, b=237.7

Instagram Font Generator

Convert text to fancy Unicode styles — copy and paste into Instagram, bios, and social posts

Your text

Style

Result

—

Hashtag Generator

Generate hashtags from topics or keywords (comma-separated)

Topics or keywords

—

Click to copy all

Bio Generator

Short Instagram-style bios — pick a style and generate

Style

Optional: your name or keyword

—

Emoji Picker

Click an emoji to copy it

Category

Click to copy

Home & Rent Affordability

How much house or rent you can afford: income and debt → max home price or max monthly rent. Combines house affordability, rent affordability, and DTI.

Affordability type

I want to see

How much house I can afford (buy) How much rent I can afford (rent)

Income & debt

Annual household income ($)

Monthly debt payments ($)

Loan & costs

Loan term (years)

Interest rate (APR %)

Down payment (%)

Property tax (% of price/yr)

Home insurance ($/yr)

HOA ($/yr)

DTI rule

Qualification rule

Reverse: target home price

Target home price ($, optional)

Comparison

What if income were ($/yr)

Price tiers

Monthly payment at max price

Required income (target price)

Financial health

Approval strength

Lifestyle impact

Down payment

Income comparison

Budget breakdown

Sales Tax Calculator

Calculate tax amount and final price

Pre-tax Price ($)

Tax Rate (%)

Reverse: Find Pre-tax Price

Total Price ($)

Tax Rate (%)

VAT Calculator

Add or remove VAT (value-added tax) from a price

VAT Rate (%)

Amount

Direction

Formula: Add VAT: amount_incl = amount_excl × (1 + rate); Remove: amount_excl = amount_incl / (1 + rate)

Tip Calculator

Split bills and calculate tips

Bill Amount ($)

Tip (%)

Number of People

Bill vs Tip

Discount Calculator

Find sale price, savings, and effective discount for single or stacked discounts.

Original Price ($)

Discounts (%)

Tip: Enter one discount for a single sale, or multiple comma-separated discounts for stacked discounting.

Find Discount % from Prices

Original Price ($)

Sale Price ($)

ROI Calculator

Return on investment and annualized ROI

Initial Investment ($)

Final Value ($)

Time Held (years)

Initial vs Return

Investment Return Calculator

Was this investment good? ROI, IRR, payback, grade, and comparison to market.

Input type

Lump sum (initial → final value) Cash flows (initial + yearly returns)

Benchmark (e.g. S&P 500) annual return (%)

Initial investment ($)

Final value ($)

Years held

Bond Calculator

Price, yield to maturity, coupon — enter known values to solve for the unknown

Face / Par value ($)

Coupon rate (% per year)

Years to maturity

Current price ($)

Yield to maturity (%)

Formula: Price = PV(coupons) + PV(par); PV(coupons) = c×(1−(1+y)^(−n))/y; PV(par) = par/(1+y)^n

Price Increase

Old and new price → absolute and % change

Old Price ($)

New Price ($)

Revenue Growth

Starting and ending revenue → growth %, CAGR, and yearly breakdown

Starting Revenue ($)

Ending Revenue ($)

Years

Creator & Ad Revenue Calculator

One calculator for RPM (YouTube/TikTok/etc.), AdSense, CPM, and affiliate revenue. Pick a mode and enter your numbers.

Mode

Monthly views

RPM ($ per 1,000 views)

Monthly impressions

CPM ($ per 1,000 impressions)

Fill rate (%)

Monthly clicks

Conversion rate (%)

Average order value ($)

Commission rate (%)

Debt Payoff Planner

Multi-loan payoff: use extra payment to target one strategy (e.g. lowest balance first); when a loan is paid off, its min payment rolls to the next.

Repayment Strategy

Extra Monthly Payment ($)

Loan Name	Balance ($)	APR (%)	Min. Payment ($/mo)

Per-Loan Results

Strategy Comparison

Balance Over Time

Month-by-Month Payment Schedule

Student Loan Calculator

Standard repayment: balance, rate, term → monthly payment and total interest

Loan balance ($)

Interest rate (APR %)

Repayment term (years)

Auto Loan Calculator

Vehicle financing with trade-in, down payment, taxes & fees

Total PriceMonthly Payment

Vehicle Price ($)

Loan Term

Interest Rate (APR %)

Cash Incentives ($)

Down Payment ($)

Trade-In Value ($)

Amount Owed on Trade-In ($)

Sales Tax Rate (%)

Title, Registration & Other Fees ($)

Include taxes and fees in loan

Principal vs Interest

Balance, Interest & Payment Over Time

Amortization Schedule

AnnualMonthly

Car Affordability

Income and existing debt → recommended max car payment and price you can afford

Annual household income ($/year)

Monthly non-car debt ($/month)

Target total debt-to-income (DTI %)

Car-only guideline (of income)We also show 10–15% of income as a rule-of-thumb for car payments.

Loan term (years)

Interest rate (APR %)

Down payment ($)

Max Loan Amount

Given a monthly payment, find the maximum loan amount you can afford

Monthly Payment ($)

Interest Rate (APR %)

Loan Term (months)

Auto Lease Calculator

Monthly lease payment, cost breakdown, and comparison to buying the same car

Total PriceMonthly Payment

Auto Price ($)

Residual Value ($)

Lease Term (months)

Rate

Down Payment ($)

Trade-in Value ($)

Sales Tax (%)

Lease

If purchased under the same conditions

Lease payment breakdown

Doc, title, and registration fees are not included. Leases often have acquisition, security deposit, and disposition fees; in practice leasing can cost more than this estimate.

Terms

Money Factor — The lease equivalent of an interest rate, usually shown as a decimal (e.g. 0.00208). Multiply by 2,400 to get approximate APR. Set by the lessor; lower is better.

Interest Rate (APR) — Annual percentage rate. Same cost of money as money factor: APR ÷ 2,400 ≈ money factor.

Residual Value — Estimated value of the vehicle at the end of the lease (set by the lessor). A higher residual usually means a lower monthly payment but a higher amount due if you buy the car at the end.

Cash Back or Low Interest

Compare cash back rebate vs low interest rate on an auto loan

Cash Back Offer

Cash Back Amount ($)

Interest Rate — High (%)

Low Interest Offer

Interest Rate — Low (%)

Auto & Loan Details

Auto Price ($)

Loan Term (months)

Down Payment ($)

Trade-in Value ($)

Sales Tax (%)

Title, Registration & Other Fees ($)

Include all fees in loan

With Cash Back Offer

With Low Interest Offer

Loan Comparison

Compare two loans by payment, total cost, and interest

Loan A

Amount ($)

APR (%)

Term (years)

Loan B

Amount ($)

APR (%)

Term (years)

Credit Card Payoff

How long to pay off a credit card with fixed monthly payments

Current Balance ($)

APR (%)

Monthly Payment ($)

Home Equity & HELOC

Available equity, Home Equity Loan vs HELOC comparison, costs over time, stress tests, and a clear recommendation.

Your home

Current home value ($)

Mortgage balance ($)

LTV lenders will use (%)

Borrow amount ($)

Use max available equity

Home Equity Loan

Interest rate (%)

Term (years)

Closing costs ($)

HELOC

Interest rate (%)

Draw period (years)

Repayment period (years)

Closing costs ($)

Annual fee ($)

Best loan payment plan

HELOC draw & repayment

Total cost over time

Net cash & equity

Payment stress test

HELOC sensitivity

Equity vs loan balance

Payment timeline

Recommendation

Rent vs Buy

Compare average monthly cost of buying vs renting over 1–30 years; break-even and chart

Home purchase

Home Price ($)

Down Payment (%)

Interest Rate (%)

Loan Term (years)

Buying Closing Costs (%)

Selling Closing Costs (%)

Property Tax (%/yr)

Property Tax Increase (%/yr)

Home Insurance ($/yr)

HOA ($/yr)

Maintenance (%/yr)

Home Appreciation (%/yr)

Cost/Insurance Increase (%/yr)

Home rent

Monthly Rent ($)

Rent Increase (%/yr)

Renter Insurance ($/mo)

Security Deposit ($)

Upfront Cost ($)

Your info

Investment Return (%/yr)

Federal Tax Rate (%)

State Tax Rate (%)

Filing Status

Include tax effects Include investment returnHorizon

Chart

Average cost by stay length

Staying Length	Average Buying Cost		Average Renting Cost
Staying Length	Monthly	Annual	Monthly	Annual

Assumptions: fixed-rate fully amortizing mortgage with level payments; investment return is applied to upfront cash as annual compound growth; property tax and insurance grow using the inputs above; tax savings are approximated as (mortgage interest + property tax) × (federal + state marginal rate).

APR Calculator

Effective APR including fees (loan amount, fees, term, rate)

Loan Amount ($)

Fees / Points ($)

Stated Interest Rate (%)

Loan Term (months)

Paycheck & Overtime Calculator

Estimate take-home pay: gross or hours + rates, federal & state tax, FICA, 401(k). Uses 2026 federal brackets.

Gross Pay ($)

Pay Frequency

Regular Hours

Regular Rate ($/hr)

OT Hours

OT Rate ($/hr)

Annual Gross (for tax) ($)

401(k) (%)

Bonus (optional, $)

Treat as separate bonus check (supplemental)

Filing Status

State tax (%)

Local/City tax (%)

401(k) Growth Simulator

Project savings to retirement age with employer match & inflation

Current Age

Retirement Age

Current Savings ($)

Monthly Contribution

$ amount % of annual salary

Annual Salary ($)

Annual Salary Growth (%)

Employer Match (% of contribution)

Match Limit (% of salary)

Expected Return (%/yr)

Inflation Rate (%/yr)

Balance Over Time

Retirement Master Planner

Project 401(k), IRA, Roth IRA & taxable accounts. See if you're on track and compare scenarios.

Retirement readiness—

Projected savings at retirement—

Estimated monthly income (4% rule)—

Desired retirement income—

Portfolio projection Show in today's dollars

Hover for values at each age.

Income replacement

Account breakdown over time

Scenario comparison

Compare up to 3 scenarios. Edit inputs and click "Add scenario" to capture current inputs as a scenario.

Retirement Income Planner

See total monthly retirement income: Social Security, pension, annuities & other. Compare claiming ages and pension vs lump sum.

Total retirement income—/ month

Status—

Annual—

Lifetime (to age)—

Income vs target

—

Monthly income by source Today's dollars

Income over time (by age)

Social Security: benefit by claim age (62–70)

Scenario comparison

Add current inputs as a scenario to compare (e.g. SS at 62 vs 70).

Withdrawal & Longevity Planner

Project withdrawals over time, see how long savings last, and understand RMD rules. Reassuring and solution-focused.

—

Age money runs out—

Monthly income supported—

Years supported—

Total lifetime withdrawals—

Balance at life expectancy—

RMD impact—

Longevity—

Portfolio balance over time Today's dollars

Planned withdrawal vs RMD

Annual withdrawal Today's dollars

Account depletion (order: Taxable → Traditional → Roth)

Spending taxable first preserves tax-advantaged growth. Roth last gives most flexibility.

Scenario comparison

Add current inputs as a scenario (e.g. lower withdrawal vs higher).

Retirement Decision Optimizer

Unified decision engine: compare strategies, see success probability, and get recommendations. Integrates savings, income, and withdrawal logic.

Retirement Readiness Score

—

/ 100

Probability of success

—%

Recommended retirement age—

Recommended SS claim age—

Safe spending level—

Income stability—

Wealth projection

Income vs spending

Strategy comparison

Compare up to 5 strategies. Use sliders or inputs and click "Add strategy" to capture.

Amortization Schedule

Full month-by-month schedule with CSV download

Loan Amount ($)

Interest Rate (APR %)

Loan Term (years)

Start Date

Principal & Interest Over Time

Investment Calculator

Money growing over time: lump sum, recurring contributions, savings goal, CD, or full investment growth

Mode

Starting Amount ($)

Annual Return (%)

Recurring Contribution ($)

Contribution Frequency

Goal Amount ($)

Solve for

Monthly Contribution ($)

Years to save

Years

Term

Length

Tax Rate (%)

Interest type

Inflation Rate (%/yr)

Formulas: Lump sum: FV = PV × (1+r)^n; Recurring: balance each period = balance×(1+r) + contribution; Savings goal: solve for n or PMT in FV of annuity

Where your final value comes from

Growth over time

Year-by-year

Year	Deposits	Interest	End balance

Inflation Calculator

Purchasing power over time using average annual rate

Original Amount ($)

Avg Annual Inflation (%)

From Year

To Year

💡 US avg: ~3.2% (1913–2024) · 2000s: ~2.6% · 2010s: ~1.8% · 2020–24: ~5.1%

Formula: Future value = Amount × (1 + inflation_rate/100)^years

Purchasing Power Over Time

College Cost Calculator

Future cost of college and how much to save (with inflation)

Current annual cost ($)

Years until enrollment

Education inflation (%/yr)

Number of years in college

GDP Calculator

GDP growth over time: initial GDP and annual growth rate → future GDP

Initial GDP ($ billion)

Annual growth rate (%)

Years

TVM Solver

Solve for PV, FV, PMT, N, or I/Y — 5-key time value of money

Solve For

N (periods)

I/Y (rate per period %)

PV (present value)

PMT (payment per period)

FV (future value)

Payment timing

💡 Use negative values for cash outflows. Leave the field you're solving for blank.

Salary Converter

Enter either annual salary or an amount per period — converts to all other equivalents.

I have

Annual Salary ($)

Hours per Day

Days per Week

Weeks per Year

Holidays/year

Vacation days/year

Inflation (%/yr, optional)

From year

To year

Job Offer Comparison

Compare two offers using compensation, benefits, and commute cost of time.

Offer A

Base salary ($/yr)

Bonus ($/yr)

Benefits ($/yr)

Commute (minutes/day)

Work days/week

Hours/day

Offer B

Base salary ($/yr)

Bonus ($/yr)

Benefits ($/yr)

Commute (minutes/day)

Work days/week

Hours/day

Commute value ($/hour)

BMI & BMR Calculator

Body Mass Index and Basal Metabolic Rate — one form, both results. Uses Units (Metric/Imperial) from header.

Gender

Age (years)

Weight

Height

Body fat % (optional)

BMR (Mifflin-St Jeor)

Body composition

Formulas: BMI = weight(kg)/height(m)²; BMR (Mifflin-St Jeor): male 10×wt+6.25×ht−5×age+5, female …−161

Body Surface Area (BSA)

Height & weight → body surface area using Mosteller, Du Bois, and Haycock formulas.

Weight

Height

Calorie / TDEE Calculator

Total Daily Energy Expenditure and calories burned per activity

Gender

Age (years)

Weight (kg)

Height (cm)

Activity Level

Calories burned (single activity)

Activity (MET)

Duration (min)

Weight (kg)

Body Fat % Calculator

Tape-method body fat using Navy / Army formulas with fitness and branch categories.

Gender

Age (years, for Army)

Method

Height (cm)

Waist (cm)

Neck (cm)

GFR Calculator (Kidney Function)

Estimated glomerular filtration rate (eGFR) — CKD-EPI formula. For reference only; not a diagnosis.

Creatinine (mg/dL)

Age (years)

Sex

Formula: CKD-EPI: eGFR = 141 × min(SCr/κ,1)^α × max(SCr/κ,1)^(−1.209) × 0.993^age

Ideal Weight Calculator

Four established formulas (Devine, Robinson, Miller, Hamwi)

Gender

Height (cm)

Height Calculator (Adult Height Predictor)

Estimate child's adult height from current height and age (Khamis-Roche method or mid‑parental)

Child's current height (cm)

Child's age (years)

Sex

Mother's height (cm, optional)

Father's height (cm, optional)

Macro Calculator (Ideal Macros for Goal)

Protein, carbs & fat targets from your TDEE and diet goal

Daily Calories / TDEE (kcal)

Body Weight — optional

Goal

Diet Type

Protein Calculator

Daily protein target from bodyweight and goal (rough guideline only)

Body Weight

Goal

Meals per day (optional)

Pregnancy Tracker

Gestational age, trimester, EDD, and week-by-week milestones

Last Menstrual Period (LMP) Conception Date

LMP Date

As of Date

Due Date Calculator

Naegele's rule (LMP) and IVF Day-3 / Day-5 transfer methods

Last Menstrual Period IVF Day-3 Transfer IVF Day-5 Transfer

LMP Date

As of Date (optional)

Conception Window & Ovulation

From due date → fertile window; or from last period → ovulation & next period

From due date (EDD) From last period (LMP)

Due Date (EDD)

Cycle Length (days)

Pregnancy Weight Gain

IOM 2009 guidelines by pre-pregnancy BMI — single and twin pregnancies

Pre-Pregnancy Weight (lbs)

Height (ft)

Height (in)

Pregnancy Type

Current Week (optional)

Pace Calculator

Running pace, distance & time — enter any two to find the third

Kilometers Miles

Distance (km)

Time — Hours

Time — Minutes

Time — Seconds

Pace (min/km) — Min

Pace — Sec

Steps to Calories Calculator

Steps, step length, and weight → distance and approximate calories burned (walking)

Steps

Step length

Step length unit

Body weight

Age Calculator

Exact age, workdays lived, next milestone birthday, and more

Date of Birth

As of Date

Days Between Dates

Days, weeks, months, and years between two dates

Start Date

End Date

Compare Using

End DateDays Until

Business Days Calculator

Count business days between two dates or compute end date from business days (excludes weekends and optional holidays).

Start Date

Mode

Calculate # Business DaysCalculate End Date from Business Days

End Date

Holidays to skip (optional)

Military Time Converter

Convert between 24‑hour and 12‑hour (AM/PM) time formats.

24‑hour time

12‑hour time

AM / PM

Countdown Timer

Set a target date and time; see time remaining (updates every second)

Target Date & Time

—

Stopwatch

Elapsed time with Start, Pause, and Reset

00:00:00.0

Sunrise / Sunset Calculator

Sunrise and sunset times for a date and location (latitude/longitude)

Date

Latitude (°)

Longitude (°)

Timezone

Moon Phase Calculator

Moon phase, illumination %, and age in days for any date

Date

Hiking Time Estimator

Estimate hiking time using Naismith’s rule with options for pace and conditions

Distance

Unit

Total ascent

Ascent unit

Base pace (flat)

Pace unit

Terrain / conditions

Calories Burned Hiking

Estimate calories burned on a hike from distance, elevation, and body weight

Distance

Unit

Total ascent

Ascent unit

Body weight

Trail difficulty

Water Requirement Calculator

Day‑hike or backpacking: estimate water needed from hours, heat, and exertion level

Hours active

Temperature

Temp unit

Intensity

People

Survival Water Calculator

Minimum daily water per person for survival scenarios (estimate only — not medical advice)

Days

People

Climate

Camp Cooking Calculator

Estimate food weight and stove fuel for camping trips

Days

People

Meals per day

Food per person per day (oz)

Stove fuel per person per day (oz)

Firewood Requirement Calculator

Estimate bundles or cubic feet of firewood needed for camping

Nights

Hours of fire per night

Burn rate (bundles per hour)

Backpack Weight Calculator

Total pack weight and % of body weight for backpacking or thru‑hikes

Body weight

Base weight (gear, kg)

Food weight per day (kg)

Days of food

Water carried (L)

Elevation Gain Calculator

Convert between feet and meters and summarize total elevation gain per mile or km

Total ascent

Ascent unit

Distance

Distance unit

Pace Count Calculator

Estimate how many double‑steps (paces) you take per 100 m or 100 yd and convert distance ↔ pace count

Paces per 100 m

Distance to walk (km)

Observed paces

Hypothermia Risk Calculator

Approximate outdoor hypothermia risk category from air temp, wind, clothing, and wetness (informational only)

Air temperature (°F)

Wind speed (mph)

Clothing insulation

Wet?

Frost Risk Calculator

Garden / crop frost risk from forecast low, dew point, and exposure (simplified)

Forecast low (°F)

Dew point (°F)

Site exposure

Garden Soil Calculator

Estimate soil volume for raised beds and convert to cubic yards and bags.

Length (ft)

Width (ft)

Depth (in)

Bag size (cu ft)

Pool Volume Calculator

Calculate pool volume in gallons and liters for rectangular or round pools.

Shape

Average depth (ft)

Length (ft)

Width (ft)

Estimated Time of Arrival (ETA)

Distance and speed → travel time and arrival clock time

Distance

Distance unit

Speed

Speed unit

Departure time (optional)

Flight Time Calculator

Estimate flight duration from distance, cruise speed, and taxi/buffer time.

Distance

Distance unit

Cruise speed

Speed unit

Taxi / delay buffer (minutes)

Jet Lag Calculator

Estimate adaptation days from timezone shift and direction of travel.

Origin UTC offset

Destination UTC offset

Direction

Horizon Distance Calculator

Estimate distance to the horizon from eye height (spherical Earth approximation)

Observer height

Height unit

Hull Speed Calculator

Displacement hull speed from waterline length

Waterline length (ft)

Boat Speed Calculator

Speed made good from distance and elapsed time (nautical or statute)

Distance

Distance unit

Hours

True vs Apparent Wind Calculator

Boat speed and true wind → apparent wind speed and angle (simplified)

True wind speed (knots)

True wind angle (° relative to bow)

Boat speed (knots)

Course & Bearing Calculator

Compute course and distance between two coordinates (great‑circle approximation)

Start lat (°)

Start lon (°)

End lat (°)

End lon (°)

Distance unit

Signal Visibility Distance

Estimate how far away a light or signal can be seen from given heights

Observer height (m)

Signal height (m)

Nautical Unit Converter

Quick conversions between nautical miles, knots, km, and mph

Value

From

Coordinate Converter

Latitude/longitude: decimal degrees ↔ degrees / minutes / seconds (DMS).

Latitude (decimal °)

Longitude (decimal °)

Latitude (DMS)

Longitude (DMS)

Time Calculator

Add or subtract hours, minutes, and seconds

Time 1 (HH:MM:SS)

Operation

Time 2 (HH:MM:SS)

Hours Calculator

Calculate hours worked and weekly pay

Day

Start Time

End Time

Break (min)

Hourly Rate ($) (optional)

Recipe Scaling

Scale ingredient amounts when changing servings or pan size

Original servings

New servings

Original pan area (optional)

Use square inches or cm² (e.g. 8×8 in pan → 64 in², 9 in round → ~64 in²).

New pan area (optional)

Ingredients (one per line)

Kitchen Converter

Convert between cups, grams, spoons, and more, using ingredient-specific densities.

Ingredient

Amount

From unit

To unit

Rice & Pasta Planner

How much dry rice or pasta and water do you need for a crowd?

Mode

Rice type

Servings

Party Food & Drink Planner

Estimate how much food and drink to buy for your event.

Adults

Kids

Event length (hours)

Drinking level

Food style

How Much Rice per Person

Estimate dry rice and water needed based on servings, meal type, and appetite.

Number of people

Serving style

Appetite

Rice type

Turkey Cooking Time

Estimate roast duration and thawing time from turkey weight.

Turkey weight

Weight unit

Turkey type

Pizza Dough Calculator

Scale pizza dough ingredients by dough ball count, weight, and baker's percentages.

Dough balls

Weight per ball (g)

Hydration (%)

Salt (%)

Instant yeast (%)

Cocktail Ratio Calculator

Scale cocktails by ratio parts for one drink or a full batch.

Servings

Drink size

Unit

Strong spirit parts

Sweet parts

Sour parts

Sourdough Hydration Calculator

Calculate flour and water from target hydration, starter amount, and starter hydration.

Total flour target (g)

Target hydration (%)

Salt (%)

Starter amount (g)

Starter hydration (%)

Cocktail Finder

What drinks can you make with what you already have? Match your cabinet in seconds.

Select what you have on hand and instantly see cocktails you can make now or with one extra bottle/ingredient.

Select common sets:

Base Spirits

Liqueurs

Mixers / Juices

Sweeteners / Syrups

Bitters / Seasoning

Bubbles / Soda

Garnish / Herbs

Filter by tag:

0 drinks you can make now

0 one-ingredient away

You can make now

No full matches yet. Add a few more ingredients to unlock recipes.

1 ingredient away

No one-away cocktails with current filters.

Back to Cooking

0 selected

GPA Calculator

Weighted GPA from course grades and credit hours

Course	Grade	Credits

Grade Calculator

Weighted final grade from assignments

Assignment	Score	Max Score	Weight (%)

Password Generator

Generate secure, random passwords

Bandwidth Calculator

Data size and speed → time to download; or size and time → required speed

Data size

Size unit

Speed (Mbps or MB/s)

Speed unit

Token Counter (OpenAI, Claude)

Estimate token counts for OpenAI and Claude from text (character/word-based approximation)

Text

AI Cost Calculator

Estimate API cost from input/output token counts for OpenAI and Anthropic models

Model

Input tokens

Output tokens

Unit Price

Compare price per unit (e.g. $/oz, $/kg)

Price ($)

Quantity

Unit

Quote Generator

Simple project quote from rate, hours, discount, and tax

Client (optional)

Project / Description

Rate ($/hour)

Estimated Hours

Discount (%)

Tax Rate (%)

Invoice Generator

Quick invoice totals from subtotal, discount, and tax (plus due date)

Client (optional)

Invoice # (optional)

Invoice Date

Days until due

Subtotal ($)

Discount (%)

Tax Rate (%)

Trip Cost Calculator

Trip cost, fuel needed, or MPG from distance and fuel used. Use for drive planning and travel budgets.

Distance

Unit

Fuel used (optional)

Fuel used unit

Fuel efficiency (if no fuel used)

Efficiency unit

Fuel price ($/gal or $/L)

Coins to Cash

Counts of US coins → total value in dollars.

Pennies (1¢)

Nickels (5¢)

Dimes (10¢)

Quarters (25¢)

Half dollars (50¢)

Dollar coins ($1)

TCO Calculator (Total Cost of Ownership)

Vehicle or asset: purchase price + annual costs over years → total cost and cost per mile

Purchase price ($)

Years of ownership

Annual fuel cost ($)

Annual insurance ($)

Annual maintenance ($)

Resale / residual value ($)

Miles per year (optional)

EV Charging Cost Calculator

Charging time, energy needed, and cost from battery size, power, and electricity rate — plus optional cost per mile and per month

Battery capacity (kWh)

Current charge (%)

Target charge (%)

Charging power (kW)

Electricity rate ($/kWh)

Efficiency (kWh per 100 miles, optional)

Miles driven per month (optional)

Speed Calculator

Distance and time → speed; or speed and time → distance

Mode

Distance + Time → Speed Speed + Time → Distance

Distance

Dist unit

Time (hours)

Time (minutes)

Engine Horsepower Calculator

Estimate vehicle HP from weight and 1/4‑mile trap speed (elapsed time optional)

Vehicle weight (lb)

Trap speed (mph, 1/4 mi)

Elapsed time (sec, optional)

Tire Size Calculator

Sidewall height, revs per mile, and diameter from tire dimensions (e.g. 225/45R17)

Width (mm)

Aspect ratio (%)

Rim diameter (in)

Rounding

Round to N decimal places or significant figures

Number

Mode

Decimal places Significant figures

Scientific Notation Calculator

Convert between decimal and scientific notation

Decimal number

Scientific notation

Big Number Calculator

Add, subtract, multiply, divide large integers (beyond normal precision)

Number A

Operation

Number B

Result

—

Half-Life Calculator

Decay: N = N₀ × 0.5^(t / t½). Enter any three to find the fourth.

Initial amount (N₀)

Remaining amount (N)

Half-life (t½)

Time elapsed (t)

Formula: N = N₀ × 0.5^(t / t½)

Slope Calculator

Slope and line equation from two points

x₁

y₁

x₂

y₂

Formula: m = (y₂ − y₁) / (x₂ − x₁); line: y = mx + b

Distance Calculator

Distance between two points (2D, 3D, or latitude/longitude on Earth)

Mode

2D 3D Lat/Long

Point 1:

x₁

y₁

Point 2:

x₂

y₂

Distance

—

Formula: d = √((x₂−x₁)² + (y₂−y₁)²) [add +(z₂−z₁)² for 3D]

Matrix Calculator (2×2)

Determinant, inverse, multiply two 2×2 matrices

Mode

a₁₁

a₁₂

a₂₁

a₂₂

Formula: det = a₁₁a₂₂ − a₁₂a₂₁; A⁻¹ = (1/det)×adj(A); C = A×B

Number Sequence Calculator

Analyze a list, or compute Arithmetic / Geometric / Fibonacci

Mode

Sequence

Next N terms

Sample Size Calculator

Find sample size n or margin of error E for proportion

Find

Proportion (p), 0–1

Margin of error (E), 0–1

Confidence

Population (N), optional

Formula: n = z²×p(1−p)/E²; with finite population N: n = n∞/(1+(n∞−1)/N); E = z×√(p(1−p)/n) or with FPC: ×√((N−n)/(N−1))

Probability Calculator

Two events (P(A), P(B)) or normal distribution (area between bounds)

Mode

P(A)

P(B)

P(A and B)

Formulas: Two events: P(A∪B)=P(A)+P(B)−P(A∩B); P(AΔB)=P(A)+P(B)−2P(A∩B); Series: P(all)=p^n, P(at least one)=1−(1−p)^n; Normal: P = Φ((Rb−μ)/σ) − Φ((Lb−μ)/σ)

Z-Score Calculator

z = (x − μ) / σ

Value (x)

Mean (μ)

Std dev (σ)

Formula: z = (x − μ) / σ

Confidence Interval Calculator

Mean ± Z × (s / √n). For population mean from sample.

Sample mean (x̄)

Sample std dev (s)

Sample size (n)

Confidence

Formula: CI = x̄ ± z × (s/√n); margin = z × (s/√n)

Ratio

Simplify ratio, solve proportion, or ratio to percentage

Mode

Ratio (e.g. 12 : 18)

Linear & Quadratic Equation

One linear (ax + b = c), quadratic ax² + bx + c = 0, or linear systems 2×2 / 3×3

Mode

Solves ax + b = c → x = (c − b) / a

Eq1: x

Eq2: x

Eq1

Eq2

Eq3

Permutation & Combination

nPr and nCr

Prime & Factors

Check prime, list factors, LCM, GCD

Number

Second (for LCM/GCD)

Ohm's Law

V = I × R — enter any two to find the third and power

Voltage (V)

Current (A)

Resistance (Ω)

Formula: V = I × R; P = V × I

Decibel (dB)

dB to power/voltage ratio and back

Type

Formula: Power ratio = 10^(dB/10); Voltage ratio = 10^(dB/20)

Density

Mass, volume, density — enter two to find the third

Mass (kg)

Volume (m³)

Density (kg/m³)

Formula: ρ = m / V (density = mass / volume)

Molarity Calculator

Molarity (M), moles, volume — enter two to find the third

Molarity (mol/L)

Moles (mol)

Volume (L)

Formula: M = n / V (molarity = moles / volume in L)

Molecular Weight Calculator

Sum atomic masses from chemical formula (e.g. H2O, CaCO3)

Formula

Dilution (C₁V₁ = C₂V₂)

Enter three of concentration/volume to find the fourth

C₁ (mol/L)

V₁ (L)

C₂ (mol/L)

V₂ (L)

Formula: C₁V₁ = C₂V₂

Solution Mixing

Mix two solutions to get final concentration

C₁ (mol/L)

V₁ (L)

C₂ (mol/L)

V₂ (L)

Mass Percent

Mass of solute / total mass × 100

Mass solute (g)

Mass solution (g)

ppm / ppb

Parts per million or billion from mass or concentration

Mass solute (g)

Mass solution (g)

Unit

Moles (mass ↔ moles)

n = m / M (moles = mass / molar mass)

Mass (g)

Molar mass (g/mol)

Moles (mol)

Formula: n = m / M

Limiting Reactant

Compare moles / stoichiometric coefficient to find limiting reactant and theoretical yield

Moles A

Coeff. A

Moles B

Coeff. B

Ideal Gas Law (PV = nRT)

Enter three of P, V, n, T to find the fourth. R = 0.08206 L·atm/(mol·K)

P (atm)

V (L)

n (mol)

T (K)

Formula: PV = nRT

Gas Density

ρ = PM / (RT) — density from pressure, molar mass, temperature

P (atm)

M (g/mol)

T (K)

Gas Cylinder Duration

Estimate time until cylinder empty at given flow rate (simplified: ideal gas)

Cylinder volume (L)

Pressure (atm)

Flow rate (L/min)

pH from [H⁺]

pH = −log₁₀[H⁺]; enter [H⁺] in mol/L

[H⁺] (mol/L)

Formula: pH = −log₁₀[H⁺]

pH Adjustment

Amount of strong acid/base to add to reach target pH (simplified: pure water or buffer)

Volume (L)

Current [H⁺] (mol/L)

Target [H⁺] (mol/L)

Add

Buffer (Henderson–Hasselbalch)

pH = pKa + log₁₀([A⁻]/[HA])

pKa

[HA] (mol/L)

[A⁻] (mol/L)

Specific Gravity

SG = ρ / ρ_ref (default ρ_ref = 1000 kg/m³ for water)

Density ρ (kg/m³)

Reference ρ (kg/m³)

Molar Mass to Density

Density from molar mass and molarity (ρ ≈ M × C for dilute aqueous; or enter mass/volume)

Molar mass (g/mol)

Molarity (mol/L)

Solvent density (g/mL)

Batch / Scale Recipe

Scale recipe by factor: new amount = base amount × scale

Base amount

Scale factor

Yield

Percent yield = (actual / theoretical) × 100

Actual amount

Theoretical amount

Purity

Purity % = (pure mass / total mass) × 100

Pure mass (g)

Total mass (g)

Faraday's Law

Q = n_e × F; charge from moles of electrons (F ≈ 96485 C/mol)

Moles of electrons

Charge Q (C)

Electroplating

Mass deposited: m = (I × t × M) / (n × F); I=current (A), t=time (s), M=molar mass, n=electrons per ion

Current I (A)

Time (s)

Molar mass (g/mol)

n (electrons)

Chlorine Dosing

Mass or volume of chlorine needed for target ppm (e.g. pool)

Volume water (L)

Target ppm

Cl concentration (%)

Water Hardness

Convert Ca²⁺ and Mg²⁺ to mg/L as CaCO₃ equivalent

Ca²⁺ (mg/L)

Mg²⁺ (mg/L)

Alkalinity

Alkalinity as mg/L CaCO₃ from titrant volume and normality

Sample vol. (mL)

Titrant vol. (mL)

Titrant N (equiv/L)

Chemical Dosing

Dose (mg/L or g/L) from target concentration and volume

Volume (L)

Target conc. (mg/L)

ABV (Alcohol by Volume)

Simple: ABV ≈ (OG − FG) × 131.25 (OG/FG as specific gravity)

OG (specific gravity)

FG (specific gravity)

Sugar Concentration (Brix / Plato)

Brix ≈ Plato for dilute solutions; % sucrose by mass

Brix (°Bx)

Plato (°P)

Coffee Ratio Calculator

Coffee : water ratio (e.g. 1:15, 1:17) — enter one of coffee or water to get the other

Ratio (coffee : water)

Coffee (g)

Water (g or ml)

Alcohol Dilution Calculator

Dilute spirit to target ABV — how much water (or diluent) to add

Spirit volume (ml)

Spirit ABV (%)

Target ABV (%)

Beam Deflection

Simply supported beam with center point load or uniform load → max deflection

Load type

Span length L (m)

Modulus E (GPa)

Moment of inertia I (m⁴)

Point load P (kN)

Uniform load w (kN/m)

Formula: Point load: δ = PL³/(48EI); Uniform: δ = 5wL⁴/(384EI)

Stress & Strain

Force and area → stress; length change → strain and approximate modulus

Force (kN)

Area (mm²)

Original length (mm)

Change in length (mm)

Formula: σ = F/A (stress); ε = ΔL/L₀ (strain); E = σ/ε (modulus)

Bending Moment Calculator

Force × perpendicular distance → bending moment (M = F·d). Supports N, kN, lbf, kip and m, mm, ft, in.

Force

Force unit

Perpendicular distance

Distance unit

Formula: M = F × d (bending moment)

Load Converter

Convert between force/load units: newton (N), kilonewton (kN), pound-force (lbf), kip

Force (N)

Force (kN)

Force (lbf)

Force (kip)

Enter exactly one value; the others will be calculated.

Column Buckling & Load Capacity

Slenderness ratio, end conditions, Euler buckling load, and safety factor → capacity check and failure mode warning

Unbraced length L (in)

End condition factor K

Cross-section area A (in²)

Radius of gyration r (in)

Material

Applied axial load P (lb)

Safety factor

Formula: P_cr = π² E I / (K·L)²; λ = K·L / r

Retaining Wall Stability Simulator

Active earth pressure, sliding and overturning checks, bearing pressure, optional water table

Wall height H (ft)

Base width B (ft)

Stem thickness (ft)

Base thickness (ft)

Toe width (ft)

Backfill unit weight γ (pcf)

Friction angle φ (°)

Wall concrete γ (pcf)

Base friction coeff. μ

Allowable bearing q_a (psf)

Water table depth below top (ft)

Structural Project Risk Analyzer

Load uncertainty, safety factor sensitivity, material cost volatility, and code compliance → risk rating

Load uncertainty

Nominal load uncertainty ± (%)

Load increase scenario (%)

Safety factor sensitivity

Design safety factor (nominal)

Minimum acceptable SF

Material cost volatility

Material cost uncertainty ± (%)

Base material cost ($)

Code compliance flags

Moment of Inertia

Common shapes (rectangle, circle, hollow circle) → second moment of area

Shape

Width b (mm)

Height h (mm)

Thermal Expansion

Length, coefficient, and temperature change → change in length and new length

Initial length (m)

Coefficient α (µm/m·°C)

ΔT (°C)

Fluid Flow

Pipe diameter with either flow rate or velocity → solve the other

Pipe inside diameter (mm)

Flow rate (L/s)

Velocity (m/s)

Provide diameter and at least one of flow rate or velocity; the other will be calculated.

Acceleration

a = Δv / Δt — enter two to find the third

Acceleration (m/s²)

Change in velocity Δv (m/s)

Time Δt (s)

Formula: a = Δv / Δt

Stopping Distance

Reaction distance + braking distance = total stopping distance

Speed (km/h)

Reaction time (s)

Deceleration (m/s²)

Formula: Reaction d = v×t; Braking d = v²/(2a); Total = reaction + braking

Free Fall

Time, velocity, and height — enter two to find the third (g = 9.81 m/s²)

Height h (m)

Time t (s)

Impact velocity v (m/s)

Formula: v = √(2gh); t = √(2h/g); h = ½gt²

Projectile Motion

Initial speed and launch angle → range, max height, flight time (g = 9.81 m/s²)

Initial speed v₀ (m/s)

Launch angle θ (°)

Formula: R = v₀² sin(2θ)/g; H = v₀² sin²θ/(2g); T = 2v₀ sinθ/g

Force (F = ma)

Force, mass, acceleration — enter two to find the third

Force F (N)

Mass m (kg)

Acceleration a (m/s²)

Formula: F = m × a

Weight

W = m × g (default g = 9.81 m/s²)

Mass m (kg)

g (m/s²)

Formula: W = m × g

Kinetic Energy

KE = ½mv² — enter two to find the third

KE (J)

Mass m (kg)

Speed v (m/s)

Formula: KE = ½ m v²

Potential Energy

PE = mgh — enter two to find the third (g = 9.81 m/s²)

PE (J)

Mass m (kg)

Height h (m)

g (m/s²)

Formula: PE = m × g × h

Work

W = F × d (force along displacement) — enter two to find the third

Work W (J)

Force F (N)

Distance d (m)

Formula: W = F × d

Hydrostatic Pressure

P = ρgh — pressure at depth (liquid)

Density ρ (kg/m³)

Depth h (m)

g (m/s²)

Formula: P = ρ × g × h

Buoyancy

F_b = ρ_fluid × V × g — buoyant force on submerged volume

Fluid density ρ (kg/m³)

Submerged volume V (m³)

g (m/s²)

Formula: F_b = ρ × V × g

Heat Energy

Q = mcΔT — heat to change temperature

Heat Q (J)

Mass m (kg)

Specific heat c (J/(kg·K))

ΔT (K or °C)

Formula: Q = m × c × ΔT

Wave Equation

v = f × λ — speed, frequency, wavelength (enter two to find the third)

Speed v (m/s)

Frequency f (Hz)

Wavelength λ (m)

Formula: v = f × λ

Centripetal Force

F = mv²/r (or F = mω²r) — force for circular motion

Force F (N)

Mass m (kg)

Speed v (m/s)

Radius r (m)

Formula: F = m v² / r

Friction Force

F_f = μ × N — sliding friction

Friction force F_f (N)

Coefficient μ

Normal force N (N)

Formula: F_f = μ × N

Momentum

p = mv — enter two to find the third

Momentum p (kg·m/s)

Mass m (kg)

Velocity v (m/s)

Formula: p = m × v

Efficiency

η = (useful output / input) × 100%

Useful output (same units as input)

Input (energy, work, power)

Formula: η = (output / input) × 100%

Load & Demand

Connected loads and demand factor → service load and estimated service current (approximate)

System

Demand factor (%)

Lighting load (kVA)

Receptacles (kVA)

Fixed appliances (kVA)

HVAC / mechanical (kVA)

Other loads (kVA)

For NEC-compliant designs, always verify against the actual code tables for your occupancy and jurisdiction.

Service Load Calculation Engine (NEC)

Residential & small commercial: demand factors, continuous vs non-continuous, EV, generator interlock, 200A/400A recommendation.

System

Service type

General loads (VA)

General lighting

Lighting demand factor (%)

Receptacles (VA)

Receptacle demand factor (%)

Appliances & HVAC

Fixed appliances (VA)

HVAC / mechanical (VA)

HVAC continuous (3+ hrs)

Other loads (VA)

Optional

EV charger (VA)

Generator interlock (exclude from service size)

Code reference: NEC Art. 220. Verify against current code and jurisdiction.

Arc Flash Risk Estimator

Fault current from transformer; working distance → simplified incident energy and PPE category suggestion.

System

Transformer size (kVA)

Secondary voltage (V)

Impedance (%Z)

Working distance (mm)

Simplified estimator. For compliance use dedicated arc-flash study software.

Panel Schedule Builder

Build a panel schedule: breakers, phases, neutral load, AFCI/GFCI. Print or copy.

Panel

Panel name

Bus rating (A)

Breakers

Circuit

Amps

Phase

AFCI

GFCI

Circuit

Amps

Phase

AFCI

GFCI

Generator backfeed circuit

Conduit Fill & Derating

Mixed sizes, THHN/XHHW, ambient & bundling correction, max fill, conduit recommendation.

Ambient temp (°C)

Conductors in cable/conduit

Conduit ID (mm)

Type

Conductor A₁ (AWG or mm²)

Quantity n₁

Conductor A₂

Quantity n₂

Conductor A₃

Quantity n₃

NEC max fill: 53% (1), 31% (2), 40% (3+). Derating per 310.15(B).

Lighting Design

Simple lumen method: room area, target illuminance, and fixture lumens → number of luminaires

Room length (m)

Room width (m)

Target illuminance (lux)

Lumens per fixture

CU (0–1)

LLF (0–1)

Cable Pulling Tension

Total pull tension and bend radius → sidewall bearing pressure

Pull tension T (lb)

Bend radius R (ft)

Allowable sidewall (lb/ft)

Material Takeoff & Cost

Up to three line items → extended cost and total (quick estimating aid)

Item 1 description

Qty 1

Unit cost 1 ($)

Item 2 description

Qty 2

Unit cost 2 ($)

Item 3 description

Qty 3

Unit cost 3 ($)

Electrical Job Cost & Margin

Labor rate, material cost, overhead, profit margin → price to charge. Quote comparison mode.

Labor

Labor rate ($/hr)

Estimated hours

Materials & overhead

Material cost ($)

Overhead allocation (%)

Margin

Target profit margin (%)

Quote comparison (optional)

Quote A price ($)

Quote B price ($)

Code Cross-Reference

Organize code sections for a project and quickly highlight matches (does not contain code text)

Sections (comma- or line-separated)

Search term (optional)

Water Pipe Sizing

Flow, length, and limits → recommended nominal size (using Hazen–Williams approximation)

Flow rate (L/s)

Equivalent length (m)

Allowable head loss (m)

Max velocity (m/s)

Hazen–Williams C

Rule-of-thumb sizing only. For critical systems, verify against local plumbing code tables.

Gas Pipe Sizing

Flow and velocity limit → approximate nominal gas pipe size (velocity-based)

Gas type

Flow rate (m³/h)

Max velocity (m/s)

Uses simple velocity-based sizing. Always confirm with official gas-sizing tables for your code and pressure range.

Drain, Waste & Vent (DWV)

Total fixture units and slope → rule-of-thumb horizontal branch and building drain sizes

Total fixture units

Horizontal slope

Sizing is approximate and for quick checks only. Confirm with your plumbing code (e.g. IPC or UPC) tables for occupancy and fixture mix.

Pressure Loss

Water line diameter, length, and flow → velocity and friction loss (Hazen–Williams)

Pipe diameter (mm)

Equivalent length (m)

Flow rate (L/s)

Hazen–Williams C

Pump Curve Analyzer

Required vs. pump BEP flow/head → simple match index (for quick screening only)

Required flow (m³/h)

Required head (m)

Pump BEP flow (m³/h)

Pump BEP head (m)

Fixture Unit Summary & Layout

Up to four fixture types → total fixture units and suggested building drain size (rule-of-thumb)

Fixture 1 name

Qty 1

FU each 1

Fixture 2 name

Qty 2

FU each 2

Fixture 3 name

Qty 3

FU each 3

Fixture 4 name

Qty 4

FU each 4

Pipe Sizing Engine

Fixture units, material, and run → design flow, velocity check, and smallest pipe that meets limits (conceptual)

Total fixture units

Building type

Pipe material

Equivalent run length (ft)

Allowable friction loss (psi)

Max velocity (m/s)

Uses a simplified demand factor model and Hazen–Williams. For permit work, verify against your plumbing code’s sizing tables.

Water Pressure Drop Planner

Up to three pipe segments + elevation → friction loss, static loss, and booster pump suggestion

Design flow (L/s)

Hazen–Williams C

Water temperature (°C)

Segment 1 length (m)

Segment 1 diameter (mm)

Segment 2 length (m)

Segment 2 diameter (mm)

Segment 3 length (m)

Segment 3 diameter (mm)

Elevation rise (m)

Supply pressure (psi)

Minimum pressure at remote (psi)

Tool is approximate and assumes full-flow Hazen–Williams behavior. Always verify with detailed design calculations.

Drainage & Vent Stack Planner

Fixture units, slope, and trap arms → suggested branch/stack sizes and code-style checks (conceptual)

Branch fixture units (FU)

Total stack fixture units (all floors)

Horizontal branch run (ft)

Horizontal branch slope (% grade)

Trap arm size (in)

Trap arm length (ft)

Vent pipe size (in)

Height of highest fixture (ft)

Uses generic IPC/UPC-style rules of thumb. Always confirm layout and sizing with your local plumbing code.

Tankless Water Heater Sizing

Simultaneous fixtures, inlet temperature, and climate → required GPM and BTU/hr

Climate

Inlet water temp (°F)

Setpoint temp (°F)

Simultaneous fixtures

Showers (2.5 GPM each)

Sinks (1.0 GPM each)

Other hot outlets (GPM)

Assumes typical low‑flow fixtures. For exact sizing, use manufacturer charts for your model and gas type.

Plumbing Job Estimator

Materials, labor, overhead, margin, and emergency markup → recommended quote and profit

Base costs

Materials subtotal ($)

Labor hours

Labor rate ($/hr)

Overhead (% of direct)

Target profit margin (%)

Emergency / after‑hours

Emergency service?

Emergency markup (%)

GPM & LPM Converter

Convert between gallons per minute, liters per minute, and cubic meters per hour

Flow (GPM)

Flow (LPM)

Flow (m³/h)

Enter exactly one value; the others will be calculated.

Water Pressure Converter

Convert between psi, bar, kPa, and meters of water column

Pressure (psi)

Pressure (bar)

Pressure (kPa)

Head (m of water)

Enter exactly one value; the others will be calculated. Uses standard freshwater approximations.

Drain Slope Calculator

Any two of run, drop, and slope → compute the third for basic drain layout

Run (ft)

Drop (in)

Slope (% grade)

Enter any two values; the third will be calculated. Positive slope means flowing “downhill.”

Tank Volume Calculator

Rectangular or cylindrical tank dimensions and fill height → volume in ft³, gallons, and liters

Tank shape

Length (ft)

Width (ft)

Diameter (ft)

Fill height (ft)

Battery Life

mAh, voltage, and load → hours of use

Capacity (mAh)

Voltage (V)

Load (mA or W)

Load unit

Voltage Drop

Approximate voltage drop and % for a copper run

System voltage (V)

Load current (A)

One-way length (ft)

Phase

Wire size (AWG, Cu)

Advanced Voltage Drop Planner

Multi-segment runs, Cu/Al, temperature, parallel conductors, motor surge, cost comparison, optimize for <3%.

System voltage (V)

Load current (A)

Max drop (%)

Conductor

Ambient temp (°C)

Parallel conductors

Segment 1 length (ft)

Segment 2 length (ft)

Motor startup surge (×)

Mode

Wire size (AWG)

Wire Size

Suggest minimum AWG for a circuit based on length, current, and allowed voltage drop

System voltage (V)

Load current (A)

One-way length (ft)

Max voltage drop (%)

Power Calculator

Single- or three-phase: voltage, current, power factor → kW, kVA, and kVAR

Phase

Voltage (V)

Current (A)

Power factor

Electricity Cost

Power, usage hours, and rate → kWh and cost per day, month, and year

Power (W)

Hours per day

Rate ($/kWh)

Battery Backup Calculator

kWh needed to cover a load for a given outage duration (with optional reserve)

Load (kW)

Outage duration (hours)

Reserve margin (%)

Generator & Backup Power Sizing

Whole-home loads, startup surge, fuel type, transfer switch, runtime. Residential & light commercial.

Load (kW)

Safety margin (%)

Startup surge (× running)

Fuel

Tank size (gal) — propane/diesel

Transfer switch

Torque Calculator

Power and speed → torque (or use torque and speed to get power)

Power (kW)

Speed (RPM)

Bolt Torque

Preload, diameter, and K-factor → tightening torque

Bolt diameter (mm)

Preload (kN)

K-factor

Gear Ratio

Driver and driven teeth (or speeds) → gear ratio and speed change

Driver teeth

Driven teeth

Input speed (RPM, optional)

Motor Speed

Line frequency, poles, and slip → synchronous and running RPM

Line frequency (Hz)

Poles

Slip (%)

Solar Panel / Savings

System size, tilt factor, sun hours, and rate → daily, monthly, and yearly kWh and bill savings

System size (kW)

Sun hours per day

Tilt factor (optional)

System efficiency (%)

Rate ($/kWh)

Roof Angle / Tilt Calculator

Roof pitch or latitude → tilt angle, tilt factor, and seasonal bias notes

Latitude (°)

Roof pitch (rise:run, e.g. 4:12)

Season focus

Sun Hours by Location

Latitude and climate band → approximate average peak sun hours per day

Latitude (°)

Climate

kWh & Watts Converter

Any two of power, energy, and hours → compute the third

Power (W)

Energy (kWh)

Time (hours)

Enter any two values; the third will be calculated.

Solar System Sizing Engine (Residential)

Monthly usage, climate, roof orientation, and losses → required DC size, panel count, and 20‑year production curve (conceptual)

Average monthly usage (kWh)

Net metering

Climate zone

Roof orientation

Roof tilt (°)

Panel efficiency (%)

Panel rating (W each)

Shading loss (%)

Inverter efficiency (%)

Annual degradation (%/yr)

Solar ROI & Financial Simulator

System cost, incentives, escalation, and financing → payback, NPV, and IRR (conceptual)

Net system cost before incentives ($)

Annual production (kWh)

Current utility rate ($/kWh)

ITC / tax credit (%)

State/local incentives ($)

Utility rate escalation (%/yr)

Analysis horizon (years)

Discount rate (%/yr)

Loan scenario (optional)

Loan APR (%/yr)

Loan term (years)

Lease scenario (optional)

Lease payment ($/month)

Battery Storage Sizing Tool

Critical loads, outage duration, chemistry, and generator → recommended kWh and module count (conceptual)

Average critical load (kW)

Peak critical load (kW)

Outage duration (hours)

Battery chemistry

Depth of discharge limit (%)

Round‑trip efficiency (%)

Generator support (kW, optional)

Battery module size (kWh each)

The optimizer also reports the minimum battery size to cover a 12‑hour outage at the entered average load.

Solar Array Layout Planner

Roof dimensions, panel size, spacing, and obstacles → estimated rows, strings, and layout summary (conceptual)

Roof length (ft, ridge to eave)

Roof width (ft)

Edge & ridge margin (ft)

Panel length (ft)

Panel width (ft)

Row spacing (ft)

Obstruction fraction (% of area)

Modules per string (target)

Module Vmp (V)

Inverter MPPT window (Vmin–Vmax)

Assumes portrait orientation and simple rectangular roof. For permit drawings, use full layout tools and manufacturer requirements.

Commercial Solar Feasibility Tool

Demand charges, TOU rates, incentives, and depreciation → annual savings and simple cash‑flow view (conceptual)

System cost before incentives ($)

Annual solar production (kWh)

On‑peak rate ($/kWh)

Off‑peak rate ($/kWh)

Demand charge ($/kW‑mo)

Demand reduction (kW)

Fraction of solar on‑peak (%)

ITC / tax credit (%)

Bonus + MACRS depreciation years

Corporate tax rate (%)

Analysis horizon (years)

Discount rate (%/yr)

Solar + EV + Battery Integration Planner

EV charging, home battery, and solar → annual energy flows, self‑consumption, and autonomy (conceptual)

Annual solar production (kWh)

Home base load (kWh/year)

EV charging

EV daily miles

EV efficiency (kWh/100 mi)

Charging on solar window (% of kWh)

Battery

Battery size (usable kWh)

Round‑trip efficiency (%)

Target off‑grid autonomy (hours)

Rates & net metering

Utility rate ($/kWh)

Net metering credit (% of retail)

Resistor Color Code

4-band or 5-band → resistance and tolerance

Bands

1st

2nd

Multiplier

Tolerance

Capacitor Code

Code → capacitance (pF, nF, µF). Supports 3-digit (e.g. 104), letter suffix (10n, 22p, 4u7)

Code

Break-Even

Fixed cost, variable cost, price → break-even units and revenue

Fixed Cost ($)

Variable Cost per Unit ($)

Price per Unit ($)

Cost & Revenue vs Units

Margin vs Markup

Convert between margin % and markup %; cost and sell price

Cost ($)

Sell Price ($)

Car Depreciation Calculator

Straight-line or declining balance depreciation schedule

Asset cost ($)

Salvage value ($)

Useful life (years)

Method

Car / Vehicle depreciation (simple % pattern)

Year 1 drop (%)

Later years (%/year)

Net Worth

Total assets minus total liabilities

Total Assets ($)

Total Liabilities ($)

Commission

Commission amount from sale amount and rate %

Sale / Amount ($)

Commission Rate (%)

Budget Calculator

Income vs spending categories — see totals and surplus/deficit

Monthly income ($)

Monthly expenses (add rows as needed)

Category

Amount ($)

Category

Amount ($)

Category

Amount ($)

Options Profit & Break-Even

Options trade P&L, break-even, and ROI for calls or puts (simplified, not for real-world risk management).

Side

Type

Contracts

Entry price (per contract, $)

Exit price (per contract, $)

Contract multiplier

Total fees & commissions ($)

Account currency

Position Size (Risk-Based)

Account size, risk per trade, entry and stop → recommended position size.

Account size ($)

Risk per trade (% of account)

Or fixed risk ($, optional)

Entry price

Stop-loss price

Trade Risk Overview

Check how much of your account is at risk across open trades (guidance only, not brokerage-grade risk engine).

Account size ($)

Max risk per trade (% of account)

Max total open risk (% of account)

Risk on this trade ($)

Total open risk ($, all trades)

Trade Profit & Loss

Entry, exit, size, and fees → P&L, return %, and outcome color.

Side

Quantity / Units

Account currency

Entry price

Exit price

Total fees & commissions

Risk-Reward & Expectancy

Entry, stop, target, and win rate → R-multiple and expectancy per trade.

Entry price

Stop-loss price

Target price

Position size (units)

Win rate (%)

Currency Profit

Forex/crypto trade P&L in account currency (simplified; ignores swap, funding, and complex pip rules).

Side

Position size (units)

Account currency

Entry price

Exit price

Crypto Profit Calculator

Crypto trade P&L: entry, exit, size, and fees in account currency.

Side

Position size (units)

Account currency

Entry price

Exit price

Fees (optional)

Liquidation Price Calculator

Leveraged or margin position → price at which you get liquidated (simplified).

Side

Entry price

Leverage (e.g. 10 = 10×)

Maintenance margin (%)

Initial margin / collateral (%)

Leverage & Exposure

Account equity and position size → live leverage and exposure (guidance only).

Account equity ($)

Position size / notional ($)

Target max leverage (e.g. 3×)

Margin Requirement

Position size and margin requirement % → required equity and free margin.

Position size ($)

Margin requirement (%)

Account equity ($)

Drawdown & Recovery

Peak vs current equity → drawdown %, required return to recover, and suggested risk level.

Peak equity ($)

Current equity ($)

Risk per trade (% of equity)

Portfolio Allocation Planner

Total portfolio value and target weights → per-asset dollar allocations.

Total portfolio value ($)

Asset 1 name

Target weight 1 (%)

Asset 2 name

Target weight 2 (%)

Asset 3 name

Target weight 3 (%)

Asset 4 name (optional)

Target weight 4 (%)

Dollar Cost Average Calculator

Multiple entries at different prices → blended average cost and total position.

Trade 1 quantity

Trade 1 price

Trade 2 quantity (optional)

Trade 2 price

Trade 3 quantity (optional)

Trade 3 price

Dividend Income Planner

Shares and dividend per share → monthly and annual income and yield.

Dividend per share ($)

Frequency

Share price (for yield %, $)

Portfolio Performance & CAGR

Starting value, contributions, and current value → total return and CAGR.

Starting value ($)

Current value ($)

Net contributions (+) / withdrawals (-), $

Holding period (years)

Trade Journal Summary

Summary stats for your trading journal → win rate, expectancy, and risk insights.

Total closed trades

Winning trades

Total profit on winners ($)

Total loss on losers ($)

Largest win ($)

Largest loss ($)

Investing Projects & Playbooks

Lightweight local projects tracker for your trades and investing ideas (saved in your browser only).

Project / playbook name

Strategy type

Time horizon

Key rules, notes & checklist

Projects are saved locally in this browser only. This is not a brokerage or cloud account.

Rental Property Calculator

Full analysis: cash flow, CoC, cap rate, IRR, wealth creation, break-even rent, and deal score. Saves to Deal Comparison so you can compare with other deals.

Purchase

Purchase Price ($)

Use Loan?

Down Payment (%)

Interest Rate (%)

Loan Term (years)

Closing Cost ($)

Need Repairs?

Repair Cost ($)

Value After Repairs ($)

Operating Expenses (annual)

Property Tax ($)

Insurance ($)

HOA ($)

Maintenance ($)

CapEx Reserve ($/yr)

Other Costs ($)

Income

Monthly Rent ($)

Other Monthly Income ($)

Vacancy Rate (%)

Management Fee (%)

Hold & Sell

Value Appreciation (%/yr)

Holding Length (years)

Cost to Sell ($)

Wealth Growth

Cash Flow by Year

Expense Breakdown

Deal Finder Mode

Enter price, rent, and rehab → Calciverse tells you: BUY, NEGOTIATE LOWER, or PASS

Purchase Price ($)

Monthly Rent ($)

Rehab Cost ($)

Estimated Taxes & Insurance (annual, $)

Other Monthly Expenses ($)

Fix & Flip (Pro)

Purchase, rehab, ARV, costs, and loan terms → net profit, ROI, offer guidance, and risk

Target Profit ($)

Purchase Price ($)

After Repair Value (ARV, $)

Rehab Cost ($)

Holding Costs ($)

Timeline (months)

Loan-to-Value (LTV, % of purchase)

Interest Rate (annual, %)

Points on Loan (%)

Realtor / Selling Fees (%)

Closing Costs (buy + sell, $)

Other Selling Costs ($)

Rehab Estimator

Cost per sq ft + detailed line items → total rehab cost and warnings

Property size (sq ft)

Cost per sq ft ($)

ARV (optional, $)

Kitchen ($)

Bathrooms ($)

Flooring ($)

Roof ($)

HVAC ($)

Electrical ($)

Windows ($)

Paint ($)

Foundation ($)

Exterior ($)

Contingency (%)

70% Rule

ARV, repairs, profit and costs → maximum allowable, safe, aggressive, and danger offers

After Repair Value (ARV, $)

Repair Cost ($)

Desired Profit ($)

Holding Costs ($)

Selling Costs ($)

BRRRR Calculator

Buy, Rehab, Rent, Refinance, Repeat → cash left in, cash out, and infinite return detection

Purchase Price ($)

Rehab Cost ($)

Holding Cost ($)

ARV ($)

Refi LTV (%)

Rent ($/mo)

Monthly Expenses ($)

Refi Rate (%)

Refi Term (years)

Airbnb Calculator

Nightly rate, occupancy, and costs → cash flow, CoC, cap rate, and minimum profitable nightly rate

Purchase Price ($)

Down Payment (%)

Interest Rate (%)

Loan Term (years)

Nightly Rate ($)

Occupancy (%)

Cleaning per stay ($)

Mgmt (% of revenue)

Supplies ($/mo)

Utilities ($/mo)

Taxes & Insurance (annual, $)

Wholesaling Calculator

ARV, repairs, assignment fee, and buyer profit target → max offer to seller and deal quality

After Repair Value (ARV, $)

Repair Cost ($)

Assignment Fee ($)

Buyer Profit Target ($)

Mortgage (Investor)

Investor‑focused mortgage with extra payments and refinance simulation

Loan Amount ($)

Interest Rate (%)

Term (years)

Extra Payment ($/mo)

Refi after (years)

Refi Rate (%)

Refi Term (years)

Sell vs Keep

Compare wealth if you sell now vs keep renting, with appreciation and loan paydown

Current Value ($)

Current Mortgage Balance ($)

Monthly Rent ($)

Monthly Expenses ($)

Rent Growth (%/yr)

Years to Compare

Appreciation (%/yr)

Selling Costs (%)

Capital Gains Tax (%)

Deal Comparison & Dashboards

Compare saved scenarios (A/B/C), with Deal Score, Risk, and wealth/timeline highlights

Saved scenarios

Compare with

Optional third

Scenarios come from Rental Property Calculator, Fix & Flip (Pro), BRRRR, Airbnb, and other Real Estate tools that save deals.

Rent Pricing Intelligence

Required rent for break-even, 8% or 10% cash-on-cash, and market risk

Property & Financing

Purchase Price ($)

Down Payment (%)

Interest Rate (%)

Loan Term (years)

Operating Expenses (annual $)

Tax + Insurance + HOA + Maint ($)

Vacancy (%)

Management Fee (%)

Lease Profitability Simulator

10-year projection with rent escalation and expense growth

Starting Monthly Rent ($)

Annual Rent Increase (%)

Starting Monthly Expenses ($)

Expense Growth (%/yr)

Vacancy (%)

Vacancy Risk Calculator

True vacancy cost and risk-adjusted return

Annual Rent ($)

Avg Vacancy Duration (months)

Turnover Cost ($)

Marketing Cost ($)

Turnovers per Year

Property Expense Benchmark

Compare your ratios: maintenance, CapEx, tax, insurance → Healthy / Risky / Overleveraged

Monthly Rent ($)

Maintenance ($/mo or % of rent)

CapEx Reserve ($/mo)

Property Tax ($/mo)

Insurance ($/mo)

Monthly Debt Service ($)

Portfolio Analyzer

Aggregate 2–20 properties: total return, DSCR, leverage, net worth impact

Properties (add up to 20)

Name

Monthly CF ($)

Value ($)

Debt ($)

Annual NOI ($)

Name

Monthly CF ($)

Value ($)

Debt ($)

Annual NOI ($)

Enter at least 2 properties. Leave value/debt at 0 if unknown; portfolio return uses cash flow only.

Cap Rate

Capitalization rate: NOI ÷ purchase price

Annual NOI ($)

Purchase Price ($)

Cash Flow

Monthly income minus expenses and debt service

Monthly Income ($)

Monthly Expenses ($)

Monthly Debt Service ($)

Cash-on-Cash Return

Annual cash flow ÷ total cash invested

Annual Cash Flow ($)

Total Cash Invested ($)

DSCR

Debt service coverage ratio: NOI ÷ annual debt service

Annual NOI ($)

Annual Debt Service ($)

House Flipping Profit

Purchase, repair, sell price, and costs → profit and ROI

Purchase Price ($)

Repair / Rehab ($)

Selling Price ($)

Holding & Selling Costs ($)

Down Payment

Purchase price and down % → down payment amount

Purchase Price ($)

Down Payment (%)

Closing Cost

Estimate closing costs from purchase price or loan amount

Purchase Price ($)

Closing Cost (%)

Price per Square Foot

Price and square footage → $/sq ft (or enter $/sq ft to get price)

Price ($)

Square Feet

Area & FAR

Lot area, footprint, and floors → floor area ratio (FAR)

Lot Area (sq ft)

Building Footprint (sq ft)

Number of Floors

Occupancy Load

Area and load factor → maximum occupants

Floor Area

Area Unit

Load Factor (area per person)

Factor Unit

Ramp Slope

Rise and run → slope percent and ratio

Rise

Run

Unit

Sun Angle & Shadow

Any two of height, sun angle, or shadow length → solve the third

Height

Shadow Length

Sun Angle (°)

Enter any two values; the third will be calculated. Use consistent units for height and shadow.

Concrete

Slab length, width, and thickness → volume and bag count

Length (ft)

Width (ft)

Thickness (in)

Tile

Room size and tile size → tiles needed (with waste)

Room Length (ft)

Room Width (ft)

Tile Length (in)

Tile Width (in)

Waste (%)

Paint

Room dimensions and coats → gallons of paint

Room Length (ft)

Room Width (ft)

Ceiling Height (ft)

Number of Coats

Coverage (sq ft/gal)

Flooring

Room area and waste → total flooring needed

Room Length (ft)

Room Width (ft)

Waste (%)

Stair Design

Total rise and run → number of steps and dimensions

Total Rise (in)

Total Run (in)

Square Footage

Length and width → area in sq ft and sq m

Length (ft)

Width (ft)

Gravel

Area and depth → gravel volume and tons

Length (ft)

Width (ft)

Depth (in)

Mulch

Beds area and depth → mulch cubic yards and bags

Length (ft)

Width (ft)

Depth (in)

Roofing

Roof size and pitch → squares and bundles

Roof Length (ft)

Roof Width (ft)

Pitch Factor

Roofing Material Optimizer

Roof geometry, complexity, and productivity → shingles, underlayment, fasteners, and labor estimate

Roof Length (ft)

Roof Width (ft)

Pitch factor

Roof complexity

Extra waste (%)

Underlayment coverage (ft²/roll)

Fasteners per square

Squares per crew‑day

Crew size

Deck

Deck size → area and board count (approximate)

Deck Length (ft)

Deck Width (ft)

Board Width (in)

Framing Layout Optimizer

Wall length, stud spacing, and openings → studs, waste, and cost estimate

Wall length (ft)

Stud spacing (in)

Stud height (ft)

Opening 1 width (ft, optional)

Opening 2 width (ft, optional)

Opening 3 width (ft, optional)

Waste (%)

Cost per stud ($)

Slab Thickness & Reinforcement Estimator

Uniform load, f′c, slab size → suggested thickness, deflection estimate, rebar spacing suggestion, and takeoff

Design inputs

Slab length (ft)

Slab width (ft)

Thickness (in)

Concrete f′c (psi)

Uniform load (psf, total)

Reinforcement

Mix ratio (cement:sand:aggregate)

Rebar size

Rebar spacing (in, each way)

Suggested thickness from span/depth; deflection from one-way strip. Confirm with project specs and codes.

Concrete Pour Planner

Slab, waste, trucks, reinforcement, cost, crew, and cure milestones in one view

Slab length (ft)

Slab width (ft)

Thickness (in)

Waste factor (%)

Truck capacity (yd³)

Concrete cost ($/yd³)

Rebar weight (lb/yd³)

Rebar cost ($/lb)

Crew size

Productivity (yd³/crew‑hr)

Hours per day

Structural Load

Uniform floor/roof load, span, and spacing → line load, reactions, and max moment/shear (for checking against tables)

Design load (psf)

Span (ft)

Joist spacing (in)

Results are for simple spans with uniform load. Use official span tables or an engineer for final sizing.

Beam Load & Deflection Engine

Multiple support types, uniform and point loads, wood/steel/concrete, deflection limits (L/240–L/480), pass/fail, minimum beam size

Support type

Material

Span (ft)

Uniform load (plf)

Point load P1 (lb)

P1 position from left (ft)

Point load P2 (lb)

P2 position from left (ft)

Beam width b (in)

Beam depth d (in)

Allowable bending stress Fb (psi)

Deflection limit

Safety factor

Footing & Soil Bearing Planner

Total load, soil bearing, footing size, safety margin, and settlement estimate

Total factored load (kips)

Support type

Soil bearing capacity (psf)

Number of columns

Proposed footing width (ft, optional)

Wall length (ft)

Proposed footing width (ft, optional)

Safety factor

Soil modulus E_s (ksf, for settlement)

Poisson ratio ν (optional)

Earthwork / Cut & Fill

Area and average cut/fill depths → volumes in cubic yards and net balance

Area Length (ft)

Area Width (ft)

Average cut depth (ft)

Average fill depth (ft)

Thermal / HVAC Load

Rule-of-thumb heating & cooling load from area, height, and insulation level

Conditioned floor area (ft²)

Ceiling height (ft)

ΔT (indoor–outdoor, °F)

Insulation level

Approximate “block load” only. For detailed HVAC design, use full Manual J / ASHRAE methods.

Room BTU Calculator

Single room dimensions and insulation → recommended heating & cooling BTU/hr

Room length (ft)

Room width (ft)

Ceiling height (ft)

ΔT (indoor–outdoor, °F)

Insulation level

CFM Calculator

Room volume and target air changes per hour → required supply airflow (CFM)

Room length (ft)

Room width (ft)

Ceiling height (ft)

Target ACH (air changes/hr)

Supply registers (optional)

Air Changes Per Hour

Measured airflow and room size → air changes per hour (ACH)

Room length (ft)

Room width (ft)

Ceiling height (ft)

Supply airflow (CFM)

SEER Savings Estimator

Existing vs new SEER, usage, and rate → annual energy savings and simple payback

Cooling capacity (BTU/hr)

Cooling hours per year

Existing SEER

New SEER

Electricity rate ($/kWh)

Upgrade cost difference ($, optional)

Heat Load Engine (Manual J Simplified)

Floor area, envelope, windows, and climate → estimated heating & cooling BTU/hr and equipment size (conceptual)

Conditioned floor area (ft²)

Ceiling height (ft)

Climate zone

Wall insulation

Window area (% of floor)

Window orientation

Home tightness

Occupants

Equipment / plug load (BTU/hr)

Conceptual sizing only. For permit or code‑critical designs, use full Manual J or local engineering standards.

Duct Sizing Planner

Target airflow, length, and friction rate → suggested duct size, velocity, and static margin (conceptual)

Total airflow (CFM)

Main duct length (ft)

Design friction rate (in w.c./100 ft)

Available static pressure (in w.c.)

Preferred velocity band

Duct shape

Rectangular aspect ratio (W:H)

HVAC System Cost & ROI Simulator

Existing vs upgrade system (cooling + heating) → annual cost, lifetime cost, and simple payback

System capacity (tons)

Cooling hours per year

Heating hours per year

Electricity rate ($/kWh)

Gas rate ($/therm)

Existing system

Existing SEER

Existing furnace AFUE (%)

Upgrade scenario

Upgrade type

New SEER

Heat pump heating COP (if applicable)

Analysis horizon (years)

Upgrade cost difference ($)

Refrigerant Line Sizing

Tonnage, line length, and rise → equivalent length, capacity impact, and oil return risk (conceptual)

System capacity (tons)

Suction line length (ft)

Liquid line length (ft)

Vertical rise (ft, outdoor unit above indoor)

Base allowable length (ft, per mfr)

HVAC Quote Builder

Equipment, labor, overhead, and financing → customer price, margin, and monthly payment

Costs

Equipment cost ($)

Labor cost ($)

Overhead (% of direct)

Add‑ons & margin

Warranty & add‑ons ($)

Target profit margin (%)

Financing

APR (% per year)

Term (months)

Down payment ($)

Bill of Materials (BOM)

Quick material list with extended costs and project total

Item description

Qty

Unit cost ($)

Item description

Qty

Unit cost ($)

Item description

Qty

Unit cost ($)

Labor Burden & Productivity

Crew size, wage, burden, and productivity → daily and total labor cost and cost per unit

Crew size

Base wage ($/hr per person)

Burden factor (%)

Hours per day

Days on job

Productivity (units/crew‑hr)

Project Margin Simulator

Material volatility, labor shifts, and delays → best/worst-case margins and break-even

Base material cost ($)

Base labor cost ($)

Overhead & other ($)

Target profit margin (%)

Material volatility (±%)

Labor volatility (±%)

Potential delay (days)

Carrying cost ($/day)

Schedule / Gantt Export

Any number of tasks → sequential schedule, dates (optional), and CSV-friendly rows

Project start date (optional)

Tasks are treated sequentially. Copy the CSV-style output row into your scheduling or Gantt software.

Task name

Duration (days)

Task name

Duration (days)

Task name

Duration (days)

Construction Bid Comparison

Compare any number of bids with schedule, material normalization, and risk‑weighted cost model

Overhead / carrying cost ($/day)

Bid

Contractor name

Bid price ($)

Schedule (days)

Material pricing vs baseline (%)

Risk score (1–5)

Bid

Contractor name

Bid price ($)

Schedule (days)

Material pricing vs baseline (%)

Risk score (1–5)

Bid

Contractor name

Bid price ($)

Schedule (days)

Material pricing vs baseline (%)

Risk score (1–5)

Tax Bracket

Effective vs marginal federal tax rate with bracket breakdown (2026 brackets)

Taxable income ($)

Filing status

Income Tax Calculator

Estimate federal refund or amount owed (2026 brackets, standard deduction)

Gross income ($/year)

Filing status

Standard deduction

Deduction amount ($)

Federal tax withheld ($)

Self-employment income (net profit, $/year, optional)

Marriage Tax Calculator

Compare federal tax: filing jointly vs as two singles (marriage bonus or penalty)

Spouse 1 income ($/year)

Spouse 2 income ($/year)

Estate Tax Calculator

Federal estate tax estimate: assets minus liabilities and exemption (2026 exemption)

Total gross estate ($)

Liabilities & costs ($)

Lifetime gifts used ($)

One Rep Max (1RM)

Estimate 1RM from weight and reps (Epley formula)

Weight Lifted (lb or kg)

Reps

Unit

Formula: Epley: 1RM ≈ weight × (1 + reps/30)

Target Heart Rate

Age-based zones (e.g. 50–85% max)

Age

Resting HR (optional)

Water Intake

Daily water recommendation by weight and activity

Weight (kg)

Activity

Sleep Cycle

Wake time → suggested bedtimes (90‑min cycles)

Wake at (time)

Cycles (4–6)

Caffeine Intake Calculator

Estimate daily caffeine intake and compare with common guidance limits.

Coffee cups (95 mg each)

Espresso shots (63 mg each)

Tea cups (47 mg each)

Energy drinks (80 mg each)

Soda cans (35 mg each)

Body weight (optional, lb)

Blood Alcohol (BAC)

Weight, sex, drinks, time → rough BAC estimate

Weight (lb)

Sex

Standard drinks

Hours since first drink

Blood Pressure

Systolic / diastolic → category based on ACC/AHA guidelines.

Systolic (mmHg)

Diastolic (mmHg)

A1c & Average Glucose

Convert between A1c (%) and estimated average glucose (eAG).

A1c (%)

Average glucose (mg/dL)

Cholesterol Ratios

Total, HDL, LDL, triglycerides → common lipid ratios and rough interpretation.

Total cholesterol (mg/dL)

HDL (mg/dL)

LDL (mg/dL)

Triglycerides (mg/dL)

Dosage

mg/kg, weight → dose (mg); optional unit

Dose (mg per kg)

Body weight (kg)

Life Expectancy

Very rough estimate of remaining years based on age, sex, smoking, and lifestyle (for fun only — not medical advice)

Age (years)

Sex at birth

Smoking status

Activity level

Diet / weight

Waist-to-Hip

Waist / hip → ratio and category

Waist (cm)

Hip (cm)

Sex

Waist-to-Height

Waist / height → ratio and cardio‑metabolic risk band

Height (cm)

Waist (cm)

Sex

Finance

Use these tools for everyday spending, borrowing, and planning. Everyday Money covers tips, tax, discounts, and fuel costs. Vehicles helps with car affordability, loans, lease vs buy, and EV costs. Borrowing & Loans handles home affordability, mortgages, HELOCs, rent vs buy, and debt payoff. Income & Budget covers paychecks, salary, taxes, and budgeting. Wealth & Investment includes net worth, ROI, inflation, bonds, and college cost. Search or pick a category below to start.

Tools by category

Business

Use these tools for pricing, margins, and running the business. Sales & Pricing covers discounts, margin vs markup, unit price, break-even, price increase, revenue growth, ROI, investment return, and creator revenue. Quotes & Invoices helps you generate quotes and invoices. Loan Comparison lets you compare loan offers. Search or pick a category below to start.

Tools by category

Real Estate

Use these tools for deal screening, analysis, and property management. Deal Screening & Offers covers deal finder, 70% rule, fix & flip, wholesaling, and investor mortgage. Analyze & Execute includes rental property, rehab estimator, BRRRR, and Airbnb. Compare & Exit helps with deal comparison and sell vs keep. Property Management Suite covers rent pricing, lease profitability, vacancy risk, expense benchmark, and portfolio analyzer. Financing links to loans and home affordability. Quick Metrics & Tools includes rent vs buy, cap rate, cash flow, cash-on-cash, DSCR, house flip, down payment, closing cost, and price per sq ft. Search or pick a category below to start.

Tools by category

401(k) Growth Simulator

Retirement Decision Optimizer Retirement Master Planner Retirement Income Planner Withdrawal & Longevity Planner

Home Affordability (from Finance)Loan & Mortgage (from Finance)Rent vs Buy (from Real Estate)HELOC / Home Equity (from Finance)

Smart defaults (power users)

Expected return (%)

Inflation (%)

Tax drag (%)

Safe withdrawal rate (%)

Life expectancy (age)

Market benchmark (%)

Maintenance reserve (%)

Property tax (%)

Insurance ($/yr)

Retirement & Financial Planning

Use these tools to plan wealth, retirement, and debt payoff. Build wealth covers the Wealth Builder engine and 401(k) growth. Retirement planning includes Retirement Architect, decision optimizer, master planner, income planner, and withdrawal & longevity planner. Debt & Cash Flow uses the Debt Destroyer engine. Compare scenarios helps you compare strategies. Finance & Real Estate links to home affordability, loan, rent vs buy, and HELOC. ROI & Business opens the ROI & Business Analyzer. Search or pick a category below to start.

Tools by category

Wealth Builder

How much will I have? Replaces: Investment calculator, Compound interest, Savings, CD, Future value.

Starting point

Current savings ($)

Monthly contribution ($)

Horizon

Years

Growth style

Preset

Advanced (inflation, tax, fees)

Inflation (%)

Tax rate (%)

Fees (%)

Portfolio growth (principal vs growth)

Growth vs contributions

Portfolio value over time

Milestones

Retirement Architect

When can I stop working? Replaces: Retirement calculator, FIRE, Pension estimator.

Lifestyle target

Desired monthly income ($)

Use replacement ratio

Replacement ratio (%)

Current progress

Age

Current savings ($)

Annual income ($)

Monthly contribution ($)

Safety nets

Social Security (% of income)

Pension ($/mo)

Buffer ($/mo)

Plan until age

Portfolio growth

Income sources

Withdrawal sustainability

Debt Destroyer

When am I debt-free? Replaces: Loan payoff, Credit card payoff, Debt snowball, Consolidation.

Strategy

Extra monthly ($)

Debts

Name	Balance ($)	APR (%)	Min. payment ($)

Debt balance over time

Interest vs principal

ROI & Business Analyzer

Is this investment worth it? Replaces: ROI, IRR, Payback period, Present value, Business calculator.

Initial investment ($)

Final value ($)

Years held

Ongoing costs ($/yr)

Cost vs profit

Value over time

Benchmark

Compare Strategies

Invest vs pay debt, real estate vs stocks, or multiple retirement ages — side-by-side.

Comparison type

Extra $ each month

Amount ($/mo)

Current savings ($)

Debt balance ($)

Debt APR (%)

Investment return (%)

Horizon (years)

Scenario

Lump sum ($)

Stocks return (%/yr)

Real estate return (%/yr)

RE: monthly rent income ($)

Years

Current situation

Current age

Current savings ($)

Monthly contribution ($)

Desired retirement income ($/mo)

Return (%)

Comparison

Over time

Tech Tools

Use these tools for display, color, encoding, and dev utilities. Display & Viewport covers screen resolution, browser info, viewport size, PPI, aspect ratio, typography, and file size. Color Tools helps with color conversion, picker, palettes, gradients, and image-to-palette. Encode & Decode handles Base64, URL, HTML, and Unicode. QR & Barcode generates QR and barcode images. Network includes subnet calculator and bandwidth. AI & LLM offers token counter and AI cost estimator. All tools run in the browser. Search or pick a category below to start.

Tools by category

Screen Resolution Checker

Your current display resolution and pixel density (read-only)

Browser Info

Detected browser, platform, and capabilities

Viewport Size

Current browser window size (updates on resize)

Screen Size / PPI Calculator

Compute PPI from resolution and diagonal, or size from PPI

Horizontal pixels

Vertical pixels

Diagonal (inches)

Aspect Ratio Calculator

Width and height → simplified ratio, decimal, and common name. Or pick a ratio and one dimension to get the other.

Width

Height

From target ratio

Ratio

Known

Value

File Size Calculator

Estimate uncompressed image or video size from resolution, bit depth, and (for video) FPS and duration.

Type

Width (px)

Height (px)

Bit depth (per pixel)

FPS (video)

Duration (seconds, video)

Typography Converter

Convert between px, pt, and em (16px base)

Value

From

Result

—

IP Subnet Calculator

IPv4 & IPv6 subnet analysis — network, broadcast, host range, and binary breakdown

IPv4 Address — accepts CIDR notation (e.g. 192.168.1.0/24)

CIDR Prefix (/0 – /32)

Subnet Mask

Color Code Converter

Paste any color format — get HEX, RGB, HSL, HSV, CMYK with copy and live preview

Color (any format)

Recent colors

Palette

Contrast (WCAG)

Contrast Checker

Check WCAG contrast ratio between foreground and background colors

Foreground

Background

Color Blindness Simulator

Preview how a color appears under common color-vision deficiencies

Input color

Simulation type

Color Picker (Eyedropper)

Pick a color from your screen using the browser eyedropper

Color Palette Generator

Generate full palettes from a base color or random: complementary, triadic, analogous, or monochromatic

Palette type

Colors

Base color (for non-random types)

Preview

Base Color

#3B82F6

Gradient Generator

Build linear or radial CSS gradients with color stops — copy CSS

Type

Angle (deg)

Stops

CSS

Image → Color Palette

Upload an image to extract dominant colors (palette)

Image

Colors to extract

Encoders & Decoders

Encode and decode text instantly. All processing happens locally.

Input

Output

QR Code Generator

Enter text or URL to generate a QR code image

Content (text or URL)

Size (px)

Barcode Generator

Generate Code 128 barcode from text or numbers

Content (numbers or text)

Text Tools

Use these tools to analyze, format, and transform text. Count & Analyze covers word and character counts, line count, reading time, and keyword density. Format & Case helps with case conversion, reverse text, trim and normalize spaces and line endings. Clean & Strip removes duplicates, empty lines, numbers, special chars, and HTML tags. Find & Replace replaces text and adds prefixes or suffixes. Sort & Lines sorts, reverses, and shuffles lines. Extract & Compare extracts emails, URLs, numbers, and compares two texts. Encode & Convert converts text to binary, ASCII, Unicode, emoji names, and Morse. URL & Slug creates and cleans URL-friendly slugs. All processing runs in the browser and stays private. Search or pick a category below to start.

Tools by category

Developer Tools

Use these tools for data, IDs, web, security, and code. JSON formats, validates, diffs, and inspects JSON. Data Formats handles CSV, XML, YAML format, validation, and conversion. IDs & Generators generates UUIDs, Nano IDs, and random hex. Web & HTTP parses URLs, query strings, and headers and builds HTTP requests. Security offers password generator, hashes, checksums, HMAC, and JWT inspector. Regex tests regex and provides cheat sheet and common patterns. Time converts Unix timestamps and ISO 8601. Code diffs, beautifies, minifies, and escape/unescape. Conversion converts number bases and byte array ↔ string. Inspect parses Base64 images and data URIs. Reference lists HTTP status codes, MIME types, and ports. All tools run in the browser. Search or pick a category below to start.

Tools by category

History