About This Site
Plain Figures is an independent website of free online calculators. It has been under new, independent ownership since2026, and it has no connection to anyone who previously ran a website on this domain.
What the site does
Each page does one job: you enter your numbers, it gives the result, and it shows the formula and the step-by-step working so you can check it. Pages explain the method and link to the sources they rely on. Calculators are added one at a time, once they are finished and tested.
How the calculators are checked
The math behind each calculator is a separate, tested piece of code, and the worked examples on each page are checked against it automatically before every release. The methodology page has the details.
Report an error
If a result looks wrong or a source is out of date, email [email protected]. Include the page address and the numbers you entered. Corrections are made as quickly as possible.