About this site

Unit Converter is a free unit converter. It runs in your browser: open the page, enter your figures and get the answer straight away, with the working shown.

How we test the calculations

Before an update is published, the tool runs through 150 automated checks in a real browser: worked examples are recalculated, edge cases and wrong input are tried, and the layout is checked on desktop and on a phone.

What the explanations rely on

The formulas and reference values in the guides follow published standards and primary sources, linked where they are used: nist.gov, physics.nist.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.

Updates and corrections

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

How the site is paid for

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

— Unit Converter editorial team