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Compare loan payments, check your math, convert units or plan a date. Explore 1020 tools with formula explanations and worked examples.

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Choose a subject to find tools for your question.

Financial

220 calculators

Loans, mortgages, investing, tax and salary.

Mortgage Amortization Auto Loan Interest Investment Compound Interest Interest Rate Retirement 401K Income Tax

All financial tools

Fitness & Health

126 calculators

BMI, calories, body composition and pregnancy.

BMI Calorie Body Fat BMR Ideal Weight Pace Pregnancy Pregnancy Weight Gain Pregnancy Conception Due Date

All fitness & health tools

Math

159 calculators

Algebra, geometry, statistics and number tools.

Scientific Fraction Percentage Random Number Generator Volume Triangle Standard Deviation Symmetric Percentage Difference Midrange Relative Frequency

Conversion

72 calculators

Length, weight, temperature, volume, speed and data units.

Centimeters to Inches Feet to Meters Kilometers to Miles Kilograms to Pounds Pounds to Kilograms Celsius to Fahrenheit Fahrenheit to Celsius Liters to US Gallons Cups to Milliliters Square Feet to Square Meters

All conversion tools

Date & Time

35 calculators

Date differences, countdowns, workdays, ages and time zones.

Date Difference Add Days to a Date Countdown to a Date Time Duration Business Days Between Dates Unix Timestamp Converter Time Zone Difference Net Work Shift Hours Meeting Person-Hours Project Capacity Duration

All date & time tools

Science

44 calculators

Physics, chemistry and engineering formulas.

Velocity Kinetic Energy Force Calculator (F = ma)Density Ohm's Law Wavelength & Frequency Molarity Ideal Gas Law (PV = nRT)Half-Life Speed, Distance, Time

All science tools

Other

154 calculators

Everyday tools, hobbies and practical helpers.

Age Date Time Hours GPA Grade Concrete IP Subnet Password Generator Conversion

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Featured calculators

Start with a common question, then compare different inputs.

Mortgage Calculator

Estimate your monthly house payment including taxes, insurance and HOA.

Compound Interest Calculator

Compare compounding frequencies and see the effective rate.

BMI Calculator

Body mass index with category, healthy weight range, BMI Prime and Ponderal Index.

Percentage Calculator

Percent of a number, what percent, and percent change.

GPA Calculator

Grade point average from letter grades and credits (grade/credits per line).

Age Calculator

Exact age in years, months, days and more.

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Understand the calculation

Mortgage payments

See how principal, interest and the repayment term shape a monthly payment.

Mortgage tool & guide

Savings growth

Explore compounding, regular contributions and the assumptions behind growth estimates.

Compound interest guide

Percentages

Work through percentage questions with the formula, variable definitions and a worked example.

Percentage tool & guide

Formulas, testing and limitations

Automated tests help check calculator behavior; they do not guarantee that every model fits your situation. Review units, assumptions and rounding. Financial, health and tax outputs may be estimates, and currency tools use reference rates rather than live quotes.

Our calculation methodology

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Calculators are free to use without an account. Learn about the site, report a calculation issue or review how your information is handled.