Which weight units can I convert?
Metric: milligrams, grams, kilograms, and tonnes. Imperial/US: ounces, pounds, and stone. Choose the unit you are entering; the other conversions appear as result tiles.
Interactive calculator loads when JavaScript is enabled. All calculations stay on your device.
Usage
- Convert body weight between kilograms and pounds.
- Translate recipe or shipping weights across unit systems.
- Check gym plate or luggage limits listed in different units.
- Convert stone and pounds for UK-style weight readings.
- Swap from any result tile to make that conversion your new starting point.
Knowledge
Mass conversions use fixed factors relative to the kilogram. The international avoirdupois pound is exactly 0.45359237 kg; 1 oz = 1/16 lb; 1 stone = 14 lb.
A metric tonne is 1 000 kg. Enter one unit — the converter shows every other unit through kilograms behind the scenes. This tool does not include US short tons or UK long tons.
FAQs
Is a tonne the same as a ton?
This tool uses the metric tonne (1 000 kg). A US short ton and UK long ton are different and are not listed separately.
How accurate are the conversions?
Conversions use exact international factors (for example 1 lb = 0.45359237 kg). Display is rounded for readability.
Can I convert between metric and imperial?
Yes. Enter a value in any unit — for example kilograms — and read pounds, stone, and the rest from the result tiles.
Can I swap from a result?
Yes. Tap Swap on any result tile to move that value and unit into the input and recalculate the other conversions.
Is my data stored or sent anywhere?
No. Everything runs in your browser. Nothing you type is uploaded or saved on a server.