Weight Converter
A weight converter changes a mass from one unit to another, for example kilograms to pounds. This tool uses the exact definition 1 lb = 0.45359237 kg, covers grams, ounces, stones, tonnes, US and UK tons, troy ounces and carats, and also shows results as pounds and ounces or stones and pounds.
Free, no signup. Runs entirely in your browser; files and text are not uploaded.
How to use the Weight Converter
- Enter the weight in the Value box.
- Select the starting unit in From and the target unit in To.
- Press the swap button to convert the other way.
- Copy the result, or read the all-units table for pounds and ounces and stones and pounds.
Features
- Kilograms, grams, milligrams, micrograms and metric tonnes
- Pounds, ounces, stones, US short tons and UK long tons
- Troy ounces for precious metals and carats for gems
- Pounds-and-ounces and stones-and-pounds output
- Exact factors: 1 lb = 0.45359237 kg, 1 oz = 28.349523125 g
- All-units table, presets, precision control and copy buttons
Frequently asked questions
How many pounds are in a kilogram?
One kilogram is about 2.20462 pounds. The pound is defined as exactly 0.45359237 kg, so divide kilograms by 0.45359237 to get pounds.
How many grams are in an ounce?
One avoirdupois ounce is exactly 28.349523125 grams. A troy ounce, used for gold and silver, is 31.1034768 grams.
How much is a stone in kilograms?
One stone is 14 pounds, which is exactly 6.35029318 kg. It is commonly used for body weight in the UK and Ireland.
What is the difference between a US ton and a UK ton?
A US short ton is 2,000 lb (907.18474 kg), a UK long ton is 2,240 lb (1,016.0469088 kg) and a metric tonne is 1,000 kg.
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Built and reviewed by Naqash Thaheem, Technical Project Manager. Last reviewed 2026-09-24.