About TransformUnits

Who we are

TransformUnits is a free, multilingual unit-conversion reference covering length, mass, temperature, volume, time, area, speed, energy, pressure, data and carbon-emissions units. It is built and maintained independently by a single operator. The method used to produce the data — sourcing, review cadence, and the correction process — is documented on the pages linked below.

Data sources & methodology

Conversion factors are derived from primary standards — the BIPM SI Brochure, NIST Special Publication 811, and national legislation such as the 1959 international yard and pound agreement — rather than copied from other conversion sites. The full method, including a worked derivation and the rounding policy used across the site, is on the Methodology page.

Updates & corrections

Conversion data is reviewed on the schedule and triggers set out in the Editorial Policy, including a 14-day target for verifying and publishing reported corrections. Every published correction and content update is recorded, with its date, in the Changelog.

Common questions

What is this converter for?

It helps you convert measurement values quickly across categories like length, mass, temperature, time, and more.

Do I need an account to use it?

No sign-in is required. The converter is available instantly and free to use.

Can I convert metric and imperial units?

Yes. You can switch between metric and imperial units in supported categories with immediate results.

Will it work on my phone?

Yes, the converter is designed to be responsive and works well on mobile devices.

How can I report an issue or suggest a feature?

Use the contact page to send feedback, correction requests, or ideas for new conversions.

Who runs TransformUnits?

TransformUnits is built and maintained by a single independent operator. Its sourcing method, review process and correction log are published openly on the Methodology, Editorial Policy and Changelog pages, so the data can be checked directly against its sources.