Every calculator you need in one place
60+ free online calculators for math, finance, health, physics, chemistry and more. Popular features from the web's best calculator sites — all quick, accurate and 100% free.
PopularPercentage Calculator
Find percentages, discounts, increases and decreases instantly.
PopularFraction Calculator
Add, subtract, multiply and divide fractions or mixed numbers.
PopularScientific Calculator
Full-featured scientific calculator for advanced expressions.
PopularTriangle Calculator
Solve sides, angles and area of any triangle.
PopularStandard Deviation Calculator
Compute mean, variance and standard deviation for a data set.
PopularSquare Root Calculator
Find square roots and simplify radical expressions.
Exponent Calculator
Raise numbers to any power, including negative exponents.
Log Calculator
Evaluate natural, base-10 and custom-base logarithms.
Percentage Increase Calculator
Measure the percentage change between two values.
Pythagorean Theorem Calculator
Find the missing side of a right triangle.
Circumference Calculator
Get circumference, area, radius and diameter of a circle.
PopularGPA Calculator
Convert grades into GPA on a 4.0 scale.
PopularGrade Calculator
Work out the grade you need on your final exam.
Slope Calculator
Compute slope, angle and line equation from two points.
Significant Figures Calculator
Count significant figures and round correctly.
Scientific Notation Converter
Switch between decimal and scientific notation.
PopularMortgage Calculator
Estimate monthly payments, interest and amortization.
PopularLoan Calculator
Calculate payments and total interest for any loan.
PopularAuto Loan Calculator
Plan car financing with taxes and trade-ins.
PopularInterest Calculator
Compute simple and compound interest on savings.
PopularCompound Interest Calculator
See how investments grow with compounding.
Investment Calculator
Project returns with contributions over time.
Retirement Calculator
Estimate what you need to retire comfortably.
Amortization Calculator
Build a full loan amortization schedule.
Inflation Calculator
See how purchasing power changes over time.
Sales Tax Calculator
Add or remove sales tax from any price.
Salary Calculator
Convert salary between hourly, weekly and yearly.
Income Tax Calculator
Estimate federal income tax and take-home pay.
Payment Calculator
Find the monthly payment for any fixed loan.
PopularBMI Calculator
Check your body mass index from height and weight.
PopularCalorie Calculator
Estimate daily calories to lose, keep or gain weight.
PopularBody Fat Calculator
Estimate body fat percentage from simple measurements.
BMR Calculator
Find your basal metabolic rate to plan dieting.
Ideal Weight Calculator
Get a healthy weight range for your height.
PopularPregnancy Calculator
Track pregnancy progress and key milestones.
Due Date Calculator
Estimate your baby's due date.
Pace Calculator
Work out running pace, time or distance.
PopularVelocity Calculator
Solve speed, distance and time problems.
Force Calculator
Apply Newton's second law to find force or mass.
Kinetic Energy Calculator
Compute kinetic and potential energy.
Gravitational Force Calculator
Find attraction between two masses.
Density Calculator
Calculate density, mass or volume.
PopularMolarity Calculator
Find molar concentration of a solution.
Mole Calculator
Convert between moles, mass and particles.
pH Calculator
Determine pH from concentration.
Dilution Calculator
Plan solution dilutions with C1V1 = C2V2.
PopularUnit Converter
Convert length, weight, volume, temperature and more.
Length Converter
Convert between metric and imperial lengths.
Weight Converter
Convert mass between kg, lb, oz and stones.
PopularTemperature Converter
Convert Celsius, Fahrenheit and Kelvin.
Speed Converter
Convert mph, km/h, m/s and knots.
PopularAge Calculator
Find your exact age in years, months and days.
PopularDate Calculator
Add or subtract days from any date.
Time Calculator
Add, subtract and convert time durations.
Hours Calculator
Compute hours between two times.
IP Subnet Calculator
Calculate subnet masks and host ranges.
PopularPassword Generator
Create strong random passwords.
Random Number Generator
Generate random numbers in any range.
Concrete Calculator
Estimate concrete volume for slabs and footings.
Tip Calculator
Split the bill and calculate tips fast.