About CalculatorDB

CalculatorDB is a free library of online calculators. We started with a simple idea: a calculator should not be a black box. If a tool tells you a mortgage will cost $2,528 a month or that your body needs 2,600 calories a day, you should be able to see exactly how that number was reached.

What you will find here

Finance Calculators – 554 tools
Math Calculators – 643 tools
Statistics & Probability Calculators – 179 tools
Health Calculators – 423 tools
Fitness & Sports Calculators – 108 tools
Everyday Life Calculators – 260 tools
Unit Converters – 307 tools
Physics Calculators – 524 tools
Chemistry Calculators – 101 tools
Biology Calculators – 104 tools
Construction Calculators – 149 tools
Food & Cooking Calculators – 67 tools
Ecology & Environment Calculators – 32 tools
Grades, Tips & More – 183 tools

Alongside the calculators, the CalculatorDB blog publishes longer guides on topics such as planning a home purchase, preparing for retirement and running statistical tests by hand.

How our calculators work

Published formulas. We use standard, documented methods: the amortization formula used by lenders, the Mifflin–St Jeor equation for metabolic rate, the US Navy body fat equation, exact unit definitions, and so on. Each page names its formula.
Input checks. Values are validated before calculating, so a missing field or impossible number produces a clear message rather than a misleading result.
Private by design. Calculations run entirely in your browser. We do not receive or store the numbers you enter.
Free to use. No account, no sign-up and no limits. The site is supported by advertising.

Important limits

Our results are estimates for education and planning. They are not financial, tax, legal or medical advice. Lenders, employers, plan administrators and health professionals may use additional information we do not have. See our editorial policy and terms of use.

Contact

Found an error or want to suggest a calculator? Email info@calculatordb.com or visit our contact page.