About the weight converter
Weight and mass are different quantities in physics - mass is how much matter something contains, weight is the force gravity exerts on it - but in everyday use the words are interchangeable and every unit here is a unit of mass.
Stone is still in common use in Britain and Ireland for body weight and almost nowhere else. One stone is 14 pounds, so a weight given as 11 stone 4 is 158 pounds, or about 71.7 kilograms.
Frequently asked questions
- Is anything I enter sent anywhere?
- No. Every conversion runs inside your browser. Nothing you type is uploaded, stored or logged, and the page keeps working with the network disconnected.
- How many pounds are in a kilogram?
- About 2.2046226. The relationship is defined the other way round: a pound is exactly 0.45359237 kilograms.
- Is a US ton the same as a tonne?
- No, and the difference is about 10%. A tonne (metric ton) is 1,000 kilograms; a US or short ton is 2,000 pounds, which is roughly 907 kilograms.
- How accurate are these conversions?
- The factors are the exact legal definitions rather than rounded approximations - an inch is exactly 0.0254 metres and a pound exactly 0.45359237 kilograms - and results are shown to eight significant figures, which is more precision than any practical measurement carries.
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How your data is handled
Everything happens on your device. There is no upload, no storage and no logging. Closing the tab clears everything you entered.