About

What this site is

Percentages come up constantly: in pay rises, sale prices, tax bills, restaurant tips, test scores, and a hundred other everyday situations. Most people can muddle through, but it is easy to get the wrong answer, especially when the calculation runs backwards or involves more than one step.

This site is a collection of free percentage calculators built for exactly those moments. There are no sign-ups and no paywalls. Every calculator gives you the answer straight away, and then shows you the formula filled in with your actual numbers, so you can see exactly how the result was reached. That last part matters: an answer you understand is more useful than one you just have to trust.

How the calculations are checked

Every formula is checked against established mathematical sources before it goes live. Each page carries a "last reviewed" date showing when it was last verified. If something turns out to be wrong, it is corrected within 48 hours. If you spot an error, please get in touch and we will fix it promptly.

Get in touch

Questions, error reports, and calculator suggestions are all welcome. Contact us and we will get back to you within two working days.