Weight Converter
Enter a weight, choose the unit it is in and the unit you want. You get the converted weight and a table of the same weight in every unit.
Your numbers
How we calculate it
Every weight is turned into kilograms and then into the unit you want. The pound is defined exactly as 0.45359237 kg. An ounce is one sixteenth of a pound (28.349523125 g), a stone is 14 pounds, a US short ton is 2,000 pounds and a UK long ton is 2,240 pounds. A metric ton is 1,000 kg.
So 1 pound is 453.59237 grams and 1 kilogram is about 2.2046226 pounds. Results are shown to 12 significant digits.
Assumptions and limits
- Weight and mass are not the same thing in physics, but in everyday use these units measure how heavy something is, and that is what this page converts.
- These are avoirdupois ounces and pounds. Troy ounces, used for precious metals, are not included.
- A tonne is the metric ton. The US ton and the UK ton are different from each other and from the metric ton.
Frequently asked questions
How many pounds are in a stone?
A stone is 14 pounds, which is 6.35029318 kilograms. It is still used for body weight in the UK and Ireland.
How do I convert pounds to kilograms?
Multiply the pounds by 0.45359237. For example 150 pounds is 68.0388555 kilograms. To go the other way, divide by 0.45359237 or multiply by 2.20462262.
What is the difference between a ton and a tonne?
A tonne is a metric ton of 1,000 kilograms. A US ton is 2,000 pounds, about 907 kilograms, and a UK ton is 2,240 pounds, about 1,016 kilograms.
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Worked example (a fixed example using the starting numbers, it does not change as you type)
Inputs: Value to convert = 1; From = pound (lb); To = kilogram (kg).
- Result 0.45359237 kg
- Conversion 1 lb = 0.45359237 kg
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