About SimpleMathCalc

SimpleMathCalc is a small collection of free calculators for percentages, fractions, averages and grades, built to be fast, private and transparent.

What we offer

The site covers the everyday math questions people search for most, organised into five categories: percentages, math and grades (fractions, averages and weighted grades), date and time calculations, unit conversions for length, weight and temperature, and text tools for counting words and characters. Each page explains the formula, includes worked examples you can check by hand, and describes where the method stops being reliable.

How we build the tools

All formulas are standard arithmetic taught in school and used in business and science. Every calculation runs in your browser, and the core math functions are covered by automated tests, including edge cases such as zero denominators, division by zero and negative numbers.

Privacy

We do not collect the numbers you enter. See the Privacy Policy for details.

Corrections

If you spot an error, please let us know through the contact page. Results are for general information; please read the Disclaimer and Terms of Use.