About this site

Percentage Increase Calculator is a single-purpose site: one free percentage increase calculator that works in the browser, with the method explained next to the result.

How the tool is checked

Every release of the percentage increase calculator is checked by an automated test suite of 127 checks in a real browser — normal values, edge cases and invalid input — and on desktop and phone screen sizes before it goes live.

What the explanations rely on

The formulas and reference values in the guides follow published standards and primary sources, linked where they are used: en.wikipedia.org, bls.gov.

Editorial principles

Pages are written and maintained by the site's editorial team. We aim to answer the question people actually ask, show worked examples with real numbers, and say plainly where a calculator cannot replace professional advice. Nothing on this site is sponsored content.

Keeping it current

Published October 8, 2026, last reviewed October 12, 2026. Corrections are welcome via the contact page; confirmed fixes go out with the next update.

Funding

Advertising keeps the site free. Ads are kept separate from results and do not influence what the tool shows.

— Percentage Increase Calculator editorial team