Making percentage calculations easier to understand.

What you will find here

The collection covers a range of calculations, from everyday discounts and price changes to classroom topics such as percentage error, mass percent and theoretical yield.

Each calculator is intended to address a particular calculation rather than make you work through an unrelated collection of tools.

Our approach

A useful result should be understandable, not just a number on a screen. That is why the project focuses on clear inputs, relevant formulas and explanations that help users interpret their results.

Free and accessible

The calculators are designed to work directly in a web browser. No account is required to use the calculation tools.