Type a value into any field and instantly see it converted across kilograms, grams, pounds, ounces, stone, US tons and metric tons.
Runs entirely in your browser — nothing you enter is uploaded or stored.
Kg, g, lb, oz, stone, US tons and metric tons all update together.
Built on the internationally agreed avoirdupois pound (0.45359237 kg).
No accounts, no uploads — every calculation stays on your device.
Enter a weight in whichever unit you already have, and the rest fill in automatically.
Weight units mix metric mass (kilograms, grams, metric tons) with imperial and US customary units (pounds, ounces, stone, US tons). Body weight is reported in stone in the UK, pounds in the US, and kilograms almost everywhere else, which makes mistakes common when reading fitness, medical or shipping figures from a different country.
This converter routes every value through kilograms as its base unit, using the exact international avoirdupois pound: 1 lb = 0.45359237 kg exactly. From there, 1 ounce = 1/16 lb = 28.349523125 g, 1 stone = 14 lb = 6.35029318 kg, 1 US (short) ton = 2,000 lb = 907.18474 kg, and 1 metric ton = 1,000 kg exactly.
One stone is 14 pounds (about 6.35 kg) and is the everyday unit for adult body weight in the UK and Ireland.
A US short ton (2,000 lb, 907.18 kg) is about 10% lighter than a metric tonne (1,000 kg, 2,204.62 lb).
Ounces appear both for food weight (28.35 g each) and for postal weight limits — always the same avoirdupois ounce here.
Converting a cooking volume like a cup into grams also depends on the ingredient's density, which is outside plain mass conversion.
Common questions about converting between kg, lb, oz, stone and tons.
One pound equals exactly 0.45359237 kilograms. This is the internationally agreed avoirdupois pound used since 1959.
One stone equals exactly 14 pounds, or about 6.35029318 kilograms. Stone is used mainly in the UK and Ireland for body weight.
A US (short) ton is exactly 2,000 pounds, about 907.18474 kilograms. A metric ton (tonne) is exactly 1,000 kilograms, about 2,204.62 pounds — roughly 10% heavier than a US ton.
One avoirdupois pound equals exactly 16 ounces, and one ounce equals exactly 28.349523125 grams.
It handles general mass units like grams, ounces and pounds. Converting a cooking volume such as a cup into weight also depends on the ingredient's density, which this tool intentionally does not assume.