A little clarity. For every calculation.

401K Calculator

Project account growth and the effect of withdrawal tax.

403B Retirement Plan Calculator

Read the existing 403(b) planning guide and calculator.

Ad Revenue Calculator

Estimate advertising revenue using traffic and rate assumptions.

Age Calculator

Calculate age and compare the years, months and days between dates.

Amortization Calculator

Estimate a regular loan payment and total interest over the term.

Annuity Calculator

Project a balance with regular contributions and compound growth.

Annuity Payout Calculator

Calculate level withdrawals that exhaust a balance over a fixed period.

Anorexic BMI Calculator

Calculate adult BMI and a reference weight range without diagnosing a condition.

APR Calculator

Estimate the effective borrowing rate including upfront fees.

Area Calculator

Calculate areas for common shapes using their dimensions.

Army Body Fat Calculator

Calculate waist-to-height ratio, with a historical body-fat estimate for comparison.

Auto Lease Calculator

Estimate a lease payment from depreciation and finance charges.

Auto Loan Calculator

Estimate fixed-rate monthly payments and total interest.

Average Calculator

Find the arithmetic mean of a set of values.

Average Return Calculator

Compare arithmetic and compounded annual returns.

BAC Calculator

Estimate blood alcohol concentration with a simplified Widmark model.

Bandwidth Calculator

Estimate transfer time from file size and connection speed.

Base64 Encode / Decode

Encode or decode text locally in your browser.

Basic Calculator

Evaluate arithmetic expressions with parentheses and powers.

Big Number Calculator

Perform exact integer arithmetic without floating-point rounding.

Binary Calculator

Perform exact integer arithmetic without floating-point rounding.

BMI Calculator

Calculate BMI from height and weight as a general screening reference.

BMR Calculator

Estimate resting energy needs from the measurements used by the equation.

Boat Loan Calculator

Estimate fixed-rate monthly payments and total interest.

Body Fat Calculator

Estimate adult body fat from circumference measurements.

Body Surface Area Calculator

Estimate body surface area with the Mosteller formula.

Body Type Calculator

Compare waist, hip and shoulder proportions.

Bond Calculator

Value a fixed-coupon bond from its yield to maturity.

Bra Size Calculator

Estimate a starting UK bra size from two measurements.

BTU Calculator

Convert heating/cooling capacity between watts and BTU per hour.

Budget Calculator

Compare monthly income and expense categories.

Business Loan Calculator

Estimate fixed-rate monthly payments and total interest.

CAGR Calculator

Find the annualized growth rate between a starting and ending value.

Calorie Calculator

Explore a daily calorie estimate based on your measurements and activity.

Calories Burned Calculator

Estimate exercise energy expenditure from a MET value.

Canadian Mortgage Calculator

Estimate monthly principal and interest payments.

Car Loan Calculator

Estimate monthly car-loan payments and total repayment costs.

Carbohydrate Calculator

Convert a chosen calorie percentage into grams.

Cash Back or Low Interest Calculator

Compare a rebate loan with a promotional-rate loan.

CD Calculator

Project a balance with regular contributions and compound growth.

Circle Calculator

Work with a circle's radius, diameter, circumference or area.

College Cost Calculator

Estimate tuition costs over a future course of study.

Commission Calculator

Calculate a percentage amount and the adjusted total.

Common Factor Calculator

Find integer factors or multiples.

Compound Interest Calculator

Explore how an initial balance grows with compound interest over time.

Conception Calculator

Estimate calendar dates from the first day of the last period.

Concrete Calculator

Estimate material volume for a rectangular area.

Confidence Interval Calculator

Estimate a normal-approximation confidence interval for a mean.

Conversion Calculator

Convert compatible length, mass, volume, time and temperature units.

Credit Card Calculator

Estimate payoff time for a fixed monthly payment.

Credit Cards Payoff Calculator

Estimate combined payoff using a fixed payment for each card.

Currency Calculator

Convert an amount using an exchange rate you supply.

Date Calculator

Find the interval between two calendar dates in several units.

Day Counter

Find calendar weekdays and the number of days between dates.

Day of the Week Calculator

Find calendar weekdays and the number of days between dates.

Debt Consolidation Calculator

Compare current loan payments with one consolidation loan.

Debt Payoff Calculator

Estimate payoff time for a fixed monthly payment.

Debt-to-Income Ratio Calculator

Compare monthly debt payments to gross income.

Density Calculator

Calculate density from mass and volume.

Depreciation Calculator

Create a straight-line depreciation estimate.

Dew Point Calculator

Estimate the dew point from air temperature and relative humidity.

Dice Roller

Roll fair virtual dice.

Discount Calculator

Calculate a percentage amount and the adjusted total.

Distance Calculator

Calculate the slope and distance between two Cartesian points.

Down Payment Calculator

Calculate the down payment and amount to finance.

Due Date Calculator

Estimate a pregnancy due date from the calendar information you provide.

Electricity Calculator

Estimate electricity use and energy cost.

EMI Calculator

Calculate an equated monthly installment from a loan amount, rate and term.

Engine Horsepower Calculator

Calculate mechanical power from torque and rotational speed.

Estate Tax Calculator

Estimate the federal tax on a simple 2026 taxable estate above the basic exclusion.

Exponent Calculator

Raise a number to a power.

Factor Calculator

Find integer factors or multiples.

Fat Intake Calculator

Convert a chosen calorie percentage into grams.

Investment

FD Calculator

Project the maturity value of a fixed deposit using a rate and term.

FHA Loan Calculator

Estimate a loan with user-supplied program fees and insurance.

Finance Calculator

Solve present value, future value or periodic payment.

Fraction Calculator

Add, subtract, multiply or divide two fractions.

Fuel Cost Calculator

Estimate fuel required and trip cost.

Future Value Calculator

Project a balance with regular contributions and compound growth.

Gas Mileage Calculator

Calculate fuel economy from distance and fuel used.

GCF Calculator

Find a common factor for the whole numbers you enter.

GDP Calculator

Calculate GDP using the expenditure approach.

GFR Calculator

Estimate adult kidney filtration using the 2021 CKD-EPI creatinine equation.

Golf Handicap Calculator

Estimate a handicap index from 20 score differentials.

GPA Calculator

Calculate a credit-weighted grade point average.

Grade Calculator

Calculate a weighted grade and the score needed on remaining work.

Gravel Calculator

Estimate material volume for a rectangular area.

Half-Life Calculator

Estimate exponential decay.

Healthy Weight Calculator

Calculate adult BMI and a reference weight range without diagnosing a condition.

Heat Index Calculator

Estimate apparent temperature from heat and humidity.

Height Calculator

Convert height between centimeters and feet/inches.

HELOC Calculator

Estimate interest-only draw payments and amortized repayment.

Hex Calculator

Perform exact integer arithmetic without floating-point rounding.

Home Equity Loan Calculator

Estimate fixed-rate monthly payments and total interest.

Home Loan Calculator

Estimate home-loan payments and interest across the repayment period.

Horsepower Calculator

Calculate mechanical power from torque and rotational speed.

Hours Calculator

Calculate elapsed working time, with explicit overnight handling.

House Affordability Calculator

Estimate a home price from a monthly housing budget.

Ideal Body Weight Calculator

Compare formula-based weight estimates using metric or US measurements.

Income Tax Calculator

Estimate 2026 US federal ordinary income tax for single or joint filers.

Inflation Adjusted Calculator

Compare a projected value with the effect of an assumed inflation rate.

Inflation Calculator

Estimate how prices and purchasing power change over time.

Interest Calculator

Project a balance with regular contributions and compound growth.

Interest Rate Calculator

Infer a fixed annual rate from a loan payment.

Investment Calculator

Project a balance with regular contributions and compound growth.

IP Subnet Calculator

Calculate an IPv4 CIDR network, address range and mask.

IRA Calculator

Project account growth and the effect of withdrawal tax.

IRR Calculator

Find an internal rate of return for conventional periodic cash flows.

Lean Body Mass Calculator

Estimate lean mass from body weight and known body fat.

Leap Year Calculator

Check a single year or find leap years within a range.

Lease Calculator

Estimate a lease payment from depreciation and finance charges.

Least Common Multiple Calculator

Find integer factors or multiples.

Loan Calculator

Estimate fixed-rate monthly payments and total interest.

Log Calculator

Find a logarithm in any positive base other than 1.

Long Division Calculator

Perform exact integer arithmetic without floating-point rounding.

Love Calculator

Generate a playful name-based score for entertainment.

Mutual Funds

Lumpsum Calculator

Project the growth of a one-time investment over a selected term.

Macro Calculator

Convert a daily calorie target into macronutrient grams.

Margin Calculator

Work out a profit margin or the revenue needed for a chosen margin.

Marriage Tax Calculator

Compare two single federal returns with one joint return for 2026.

Mass Calculator

Calculate mass from density and volume.

Matrix Calculator

Add or multiply two rectangular matrices.

Mean, Median, Mode, Range Calculator

Summarize a set of numbers.

Mileage Calculator

Calculate trip distance and mileage reimbursement.

Molarity Calculator

Calculate molar concentration of a solution.

Molecular Weight Calculator

Calculate molar mass for formulas using common elements.

Mortgage Amortization Calculator

Estimate fixed-rate monthly payments and total interest.

Mortgage Calculator

Estimate mortgage repayments from the purchase, down payment and loan terms.

Mortgage Calculator UK

Estimate monthly principal and interest payments.

Mortgage Payoff Calculator

Estimate payoff time for a fixed monthly payment.

Mulch Calculator

Estimate material volume for a rectangular area.

Mutual Fund Calculator

Project a balance with regular contributions and compound growth.

Number Sequence Calculator

Calculate a term and sum of an arithmetic or geometric sequence.

Ohms Law Calculator

Calculate current and power from voltage and resistance.

One Rep Max Calculator

Estimate a one-repetition maximum from a submaximal set.

Overweight Calculator

Calculate adult BMI and a reference weight range without diagnosing a condition.

Ovulation Calculator

Explore estimated cycle dates using the calendar inputs you provide.

P-value Calculator

Convert a z statistic into a normal-distribution p-value.

Pace Calculator

Convert a duration and distance into pace and speed.

Password Generator

Generate a random password locally in your browser.

Payback Period Calculator

Estimate simple payback from constant annual net cash inflows.

Payment Calculator

Estimate fixed-rate monthly payments and total interest.

Pension Calculator

Estimate a defined-benefit pension from a plan’s formula.

Percent Error Calculator

Compare a measured value with an accepted value.

Percent Off Calculator

Calculate a percentage amount and the adjusted total.

Percentage Calculator

Calculate a percentage, compare two values or find percentage change.

Period Calculator

Estimate calendar dates from the first day of the last period.

Permutation and Combination Calculator

Count ordered and unordered selections without replacement.

Personal Loan Calculator

Check the monthly payment and total cost of a personal loan.

Investment

PPF Calculator

Explore a PPF savings projection using regular contributions and an assumed rate.

Pregnancy Calculator

Estimate a pregnancy timeline from your entered dates.

Pregnancy Conception Calculator

Estimate calendar dates from the first day of the last period.

Pregnancy Weight Gain Calculator

Show a total pregnancy weight-gain reference range for a singleton pregnancy.

Present Value Calculator

Discount a future amount to today.

Prime Factorization Calculator

Find integer factors or multiples.

Probability Calculator

Combine two independent event probabilities.

Protein Calculator

Convert a weight-based protein target into grams per day.

Pythagorean Theorem Calculator

Find the hypotenuse, area and acute angles from two perpendicular sides.

Quadratic Formula Calculator

Solve ax² + bx + c = 0, including complex roots.

Random Number Generator

Generate uniformly distributed integers in a chosen range.

Ratio Calculator

Simplify an integer ratio.

Investment

RD Calculator

Estimate how recurring deposits accumulate over a chosen period.

Real Estate Calculator

Estimate rental yield and cash flow.

Refinance Calculator

Compare monthly payments and total remaining costs.

Rent Calculator

Estimate a monthly rent budget.

Rent vs. Buy Calculator

Compare net housing costs over a chosen holding period.

Rental Property Calculator

Estimate rental yield and cash flow.

Repayment Calculator

Estimate fixed-rate monthly payments and total interest.

Resistor Calculator

Combine resistors in series or parallel.

Retirement Calculator

Project retirement savings and a first-year withdrawal budget.

Right Triangle Calculator

Find the hypotenuse, area and acute angles from two perpendicular sides.

RMD Calculator

Calculate a distribution using your applicable IRS life-expectancy divisor.

ROI Calculator

Compare a gain with the amount invested to calculate a return percentage.

Roman Numeral Converter

Convert integers from 1 to 3999 into Roman numerals and back.

Roofing Calculator

Estimate a simple pitched roof area from its footprint.

Root Calculator

Find the real nth root of a number.

Roth IRA Calculator

Project account growth and the effect of withdrawal tax.

Rounding Calculator

Round a number to a chosen decimal place.

Salary Calculator

Convert hourly pay into weekly, monthly and annual gross salary.

Sales Tax Calculator

Calculate a percentage amount and the adjusted total.

Sample Size Calculator

Estimate a survey sample size for a population proportion.

Savings Calculator

Project a balance with regular contributions and compound growth.

Scientific Calculator

Evaluate arithmetic expressions with parentheses and powers.

Scientific Notation Calculator

Convert between decimal and scientific notation.

Shoe Size Conversion

Estimate adult shoe size from foot length.

Simple Interest Calculator

Calculate interest on a principal amount at a fixed simple-interest rate.

Mutual Funds

SIP Calculator

Explore a regular-investment projection using an assumed annual return.

Sleep Calculator

Calculate a bedtime from your wake time and desired sleep duration.

Slope Calculator

Calculate the slope and distance between two Cartesian points.

Social Security Calculator

Project an existing monthly benefit estimate with a COLA assumption.

Speed Calculator

Calculate average speed.

Square Footage Calculator

Find rectangular floor area.

Stair Calculator

Estimate a straight flight of stairs.

Standard Deviation Calculator

Explore the spread of a set of numbers around its mean.

Statistics Calculator

Summarize a set of numbers.

Stopwatch

Time an activity, pause the clock and record laps as you go.

Student Loan Calculator

Estimate fixed-rate monthly payments and total interest.

Surface Area Calculator

Calculate volume and surface area for common solids.

Mutual Funds

SWP Calculator

Estimate monthly withdrawals, remaining investment value and how long a starting balance may last.

Take-Home-Paycheck Calculator

Estimate take-home pay using your effective tax and deduction assumptions.

Target Heart Rate Calculator

Estimate a training range using heart-rate reserve.

TDEE Calculator

Estimate adult daily energy expenditure from resting energy and activity.

Temperature Calculator

Convert a temperature reading between supported unit scales.

Tile Calculator

Estimate tiles needed for a rectangular floor.

Time Calculator

Add or subtract durations.

Time Card Calculator

Calculate elapsed working time, with explicit overnight handling.

Time Duration Calculator

Calculate elapsed working time, with explicit overnight handling.

Time Zone Calculator

Convert a UTC date and time into an IANA time zone.

Tip Calculator

Calculate a tip and divide the bill among a group.

Tire Size Calculator

Calculate tire dimensions from metric sidewall markings.

Triangle Calculator

Solve a triangle from its three side lengths.

URL Encode / Decode

Encode or decode text locally in your browser.

VA Mortgage Calculator

Estimate a loan with user-supplied program fees and insurance.

VAT Calculator

Calculate a percentage amount and the adjusted total.

Voltage Drop Calculator

Estimate a two-wire DC circuit voltage drop.

Volume Calculator

Calculate volume and surface area for common solids.

Weight Calculator

Calculate weight as gravitational force.

Weight Watcher Points Calculator

Calculate a legacy nutrition-points estimate from a food label.

Wind Chill Calculator

Estimate apparent cold from temperature and wind speed.

Word Counter

Check word and character counts for the text you enter.