Calculators that get you the right answer, fast.

86 free calculators and converters across finance, health, math, and physics — no account, no ads, just the right number in seconds.

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Finance Health Math Physics Everyday

Finance

Numbers you can count on. · 24 calculators

Finance

Mortgage Calculator

Estimate your monthly mortgage payment, total interest, and payoff timeline.

Finance

Loan Calculator

Calculate the monthly payment and total interest on any fixed-rate loan.

Finance

Compound Interest Calculator

See how a deposit grows over time as interest compounds at any frequency.

Finance

Simple Interest Calculator

Calculate flat-rate interest on a principal amount over time.

Finance

Tip Calculator

Calculate the tip on a bill and split the total between any number of people.

Finance

Sales Tax Calculator

Add sales tax to a price to find the total you'll pay.

Finance

Discount Calculator

Find the sale price and savings after a percentage discount.

Finance

Auto Loan Calculator

Calculate your monthly car payment from vehicle price, trade-in, down payment, and sales tax.

Finance

Down Payment Calculator

Find the down payment amount and resulting loan amount for any purchase price.

Finance

Future Value Calculator

See what a lump sum plus monthly contributions grows to at any rate of return.

Finance

VAT Calculator

Add or remove VAT from a price at any tax rate.

Finance

Debt Payoff Calculator

Find out how long a fixed monthly payment takes to pay off a balance.

Finance

Amortization Calculator

See the full year-by-year principal and interest breakdown for any fixed-rate loan.

Finance

Interest Rate Calculator

Find the annual growth rate that turned a starting amount into an ending amount.

Finance

Payback Period Calculator

Find out how long an investment takes to pay back its initial cost from its cash flows.

Finance

Commission Calculator

Calculate commission earned from a sale amount and commission rate.

Finance

Salary Calculator

Convert pay between hourly, weekly, monthly, and annual amounts.

Finance

Present Value Calculator

Find what a future amount of money is worth today at a given discount rate.

Finance

Rent Calculator

Estimate how much rent you can afford based on your income.

Finance

Budget Calculator

Split your monthly income using the 50/30/20 budgeting rule.

Finance

Inflation Calculator

See what today's money will be worth after years of inflation.

Finance

Margin Calculator

Calculate gross margin and markup from cost and selling price.

Finance

Depreciation Calculator

Calculate straight-line depreciation for an asset over its useful life.

Finance

Savings Calculator

Find the monthly savings needed to reach a future goal.

Health

Take care of yourself. · 8 calculators

Health

BMI Calculator

Calculate your Body Mass Index and see which weight category you fall into.

Health

Calorie Calculator

Estimate your daily calorie needs based on age, sex, height, weight, and activity.

Health

Body Fat Calculator

Estimate body fat percentage from body measurements using the US Navy method.

Health

BMR Calculator

Calculate your basal metabolic rate — the calories your body burns at rest.

Health

Ideal Weight Calculator

Estimate a healthy target body weight from height and gender.

Health

Due Date Calculator

Estimate a pregnancy due date from the first day of the last menstrual period or a conception date.

Health

Target Heart Rate Calculator

Find your target heart rate zones for exercise based on your age.

Health

Body Surface Area Calculator

Estimate body surface area from height and weight using the Mosteller formula.

Math

Precision, above all. · 28 calculators

Math

Basic Calculator

A full-screen calculator for everyday addition, subtraction, multiplication, and division.

Math

Percentage Calculator

Find percentages, work out percentage change, or solve for the missing number.

Math

Fraction Calculator

Add, subtract, multiply, or divide fractions with automatic simplification.

Math

Exponent Calculator

Raise any base to any exponent, including negative and fractional powers.

Math

Root Calculator

Find the square root, cube root, or any nth root of a number.

Math

Ratio Calculator

Simplify a ratio between two numbers to its lowest terms.

Math

LCM Calculator

Find the least common multiple of two or more numbers.

Math

GCF Calculator

Find the greatest common factor of two or more numbers.

Math

Long Division Calculator

Divide two numbers and get the quotient, remainder, and decimal result.

Math

Rounding Calculator

Round a number to any decimal place or whole-number magnitude.

Math

Mean, Median, Mode & Range Calculator

Calculate the mean, median, mode, and range of a list of numbers.

Math

GPA Calculator

Calculate your weighted GPA on a 4.0 scale from grades and credit hours.

Math

Standard Deviation Calculator

Calculate the standard deviation, variance, and mean of a list of numbers.

Math

Slope Calculator

Find the slope, distance, and midpoint between two points.

Math

Quadratic Formula Calculator

Solve any quadratic equation ax² + bx + c = 0 for its roots.

Math

Log Calculator

Calculate the logarithm of a number at any base.

Math

Triangle Calculator

Solve a triangle's remaining sides, angles, and area from three known values.

Math

Permutation and Combination Calculator

Calculate the number of ways to arrange or choose items from a set.

Math

Probability Calculator

Calculate the probability of two events, combined with AND/OR logic.

Math

Percent Error Calculator

Calculate the percent error between a measured and an accepted value.

Math

Pythagorean Theorem Calculator

Find the hypotenuse, area, and perimeter of a right triangle.

Math

Circle Calculator

Find a circle's area, circumference, and diameter from its radius.

Math

Z-Score Calculator

Calculate a z-score and percentile from a value, mean, and standard deviation.

Math

Half-Life Calculator

Calculate the remaining amount of a substance after radioactive or exponential decay.

Math

Binary Calculator

Convert numbers between decimal and binary in either direction.

Math

Hex Calculator

Convert numbers between decimal and hexadecimal in either direction.

Math

Molarity Calculator

Calculate the molarity of a solution from solute mass, molar mass, and volume.

Math

Matrix Calculator

Add, subtract, multiply, transpose, and find the determinant of 2×2 and 3×3 matrices.

Physics

The laws that govern everything. · 6 calculators

Physics

Speed Calculator

Calculate speed from distance and time, in m/s, km/h, and mph.

Physics

Force Calculator

Calculate force from mass and acceleration (F = ma).

Physics

Work / Energy Calculator

Calculate mechanical work or energy from force and distance (W = Fd).

Physics

Ohm's Law Calculator

Calculate resistance and power from voltage and current.

Physics

Pressure Calculator

Calculate pressure from force and area, in pascals, atm, and psi.

Physics

Density Calculator

Calculate density from mass and volume.

Everyday

Everyday, simplified. · 20 calculators

Everyday

Age Calculator

Find the exact age in years, months, and days between two dates.

Everyday

Date Calculator

Add or subtract days, weeks, months, or years from a date.

Everyday

Password Generator

Generate a random, secure password with the character types you choose.

Everyday

Currency Converter

Convert between 30 world currencies using live ECB reference rates, with a trend chart.

Everyday

Conversion Calculator

Convert between units of length, weight, volume, and temperature.

Everyday

Time Duration Calculator

Find the exact hours and minutes between a start and end time.

Everyday

Sleep Calculator

Find the best bedtime or wake-up time based on 90-minute sleep cycles.

Everyday

Random Number Generator

Generate one or more random numbers within a range you choose.

Everyday

Fuel Cost Calculator

Estimate the fuel cost of a trip from distance, fuel efficiency, and gas price.

Everyday

Gas Mileage Calculator

Calculate your vehicle's fuel economy in MPG from miles driven and gallons used.

Everyday

Day Counter

Count the number of days between two dates.

Everyday

Time Calculator

Add or subtract two durations in hours, minutes, and seconds.

Everyday

Dice Roller

Roll one or more virtual dice with any number of sides.

Everyday

Roman Numeral Converter

Convert between numbers and Roman numerals in either direction.

Everyday

Wind Chill Calculator

Calculate the wind chill temperature from air temperature and wind speed.

Everyday

Heat Index Calculator

Calculate the heat index ("feels like" temperature) from air temperature and humidity.

Everyday

Dew Point Calculator

Calculate the dew point from air temperature and relative humidity.

Everyday

Concrete Calculator

Calculate how much concrete you need for a slab, footing, or pour.

Everyday

Square Footage Calculator

Calculate square footage from length and width, plus total cost.

Everyday

Tire Size Calculator

Compare two tire sizes to see the diameter and speedometer difference.