Free Online Calculators
Calculators for math, finance, health and everyday conversions. Each one explains how the result is worked out, so you can check the answer instead of taking it on trust.
Calculator Categories
Pick a category to find the tool you need. Calculator pages show the formula behind the result, and many include a step-by-step breakdown.
Frequently Used Calculators
Not sure where to start? These are some of the most used tools on the site.
About CalcMate
CalcMate is built and maintained by Mihail Doncenco, a developer with more than 15 years in tech. Formulas come from published sources such as WHO, NIST and official government publications, and each calculator page shows when it was last updated.
All calculators are free and need no signup. Calculations run in your browser, so the numbers you enter are not sent to our servers or stored.
Questions and Answers
What can I calculate on CalcMate?
More than 100 calculators for math, finance, health, physics and unit conversion, in 9 languages. Popular ones include mortgage payments, BMI, percentages, equation solving and salary after tax.
How does CalcMate make sure its calculations are accurate?
Each calculator is built from a published formula or an official source, and I check the output against known examples before it goes live. Every page shows the date it was last updated. If a result looks wrong to you, email [email protected] and I will look into it.
Do the calculators show step-by-step solutions?
Most math and physics calculators do. The steps show which formula was used and how each value was put into it, so you can follow the logic or check your homework.
Which formulas do the health calculators use?
BMR and TDEE use the Mifflin-St Jeor equation. BMI categories follow WHO thresholds, and body fat estimates use the US Navy circumference method. These are estimates for general information and do not replace advice from a doctor.
Is the data I enter stored or tracked?
No. Calculations run in your browser, and the numbers you enter are not sent to our servers or stored.
Do the calculators work on phones and tablets?
Yes. The site is responsive and works in any modern mobile browser on iOS and Android. There is no app to install.