Weight Converter
Convert between 9 weight and mass units, with the conversion factors shown so the result can be checked.
Your result will appear here as soon as you add some input.
How to use it
- 1Enter your values in the fields above.
- 2The answer and the working appear immediately below.
- 3Check the working to see the formula with your numbers substituted.
About the Weight Converter
The pound is defined as exactly 0.45359237 kilograms, so kilogram-pound conversions are exact.
A US ton is 2,000 pounds and a UK ton is 2,240, which is a difference of about 10% - worth checking before quoting a shipping weight. The metric tonne is 1,000 kg, different again.
Strictly these are units of mass, not weight. In everyday use the two are treated as the same thing because everything is being weighed on the same planet.
Every unit converts through a single base unit, so the arithmetic is one multiplication and one division - both shown in the working, along with the exact factor used.
Questions people ask
Is your figures uploaded to a server?
No. This tool runs entirely in your browser using standard web APIs, so your figures never leaves your device. You can confirm it by opening your browser's network panel while the tool runs, or by disconnecting from the internet after the page has loaded.
Is it free, and do I need an account?
Yes, it is free, and there is no account, no sign-up and no watermark on the result. The project is funded by optional donations.