About

This site offers a free online calculator and short maths guides for students, teachers and anyone who needs a quick, checked calculation.

Our approach

The calculator is free to use, with no registration and no hidden fees. Calculations run in your browser, so your inputs are not sent to a server for the calculation itself.

What the guides do

Each guide answers one question, shows the working, and gives a few everyday examples. They are written to be read in a few minutes and checked against the calculator above.