Weight & Mass Converter
Free weight converter: kg to lb, pounds to ounces, stone to kg, grams to oz and more. Exact definitions, an all-units table and visible rounding, in-browser.
How to use Weight Converter
- 1Enter the weight you want to convert, such as 5 or 72.5.
- 2Choose the From unit and the To unit, for example lb to kg, or press Swap.
- 3Copy the result, or open All units to copy any other unit from the table.
What makes it better
- Micrograms to tonnes, plus ounces, pounds, stone and US and UK tons
- Based on 1 lb = 0.45359237 kg exactly, so results are not off by floating-point noise
- Convert mode for a single pair, All units mode for every unit at once
- The factor behind each answer is shown under the result
About Weight Converter
Weight Converter changes a mass between metric units (microgram, milligram, gram, kilogram, tonne), avoirdupois units (ounce, pound, stone) and the US short and UK long ton. It uses the international pound of exactly 0.45359237 kg, so 5 lb is exactly 2.26796185 kg. The page measures mass; everyday scales report mass, and the troy ounce used for gold is not included.
Common uses
- Change a body weight between kilograms and stones and pounds for a medical form or fitness app.
- Convert a recipe from ounces to grams, or a postage weight from pounds to kilograms.
- Check an airline baggage allowance quoted in kilograms against a scale that reads pounds.
- Compare a US short ton with a metric tonne when reading freight or commodity prices.
Example
Input
5
Result
5 lb = 2.26796185 kg
Good to know
- The ounce here is the avoirdupois ounce (28.349523125 g) used for food and body weight, not the troy ounce used for precious metals.
- This converts mass. Force units such as pounds-force and kilograms-force are not included.
- The US short ton (2,000 lb) and the UK long ton (2,240 lb) are listed separately, and both differ from the metric tonne (1,000 kg).
Weight Converter FAQ
How many pounds are in a kilogram?
One kilogram is about 2.2046226218 pounds, since a pound is exactly 0.45359237 kg. The relationship is not a whole number, so the result is rounded, and the page tells you how many digits it kept.
How many ounces are in a pound?
There are exactly 16 ounces in a pound. Set From to pounds and To to ounces to see it, and note that this is the avoirdupois ounce of 28.349523125 g, not the troy ounce.
How do I convert stone to kg?
One stone is 14 pounds, or exactly 6.35029318 kg. So 11 stone is 69.85322498 kg. For a stones-and-pounds figure such as 11 st 4 lb, convert the whole stones and the pounds separately and add them.
Is a tonne the same as a ton?
No. A tonne (metric ton) is 1,000 kg. A US ton is 2,000 lb (907.18474 kg) and a UK ton is 2,240 lb (1,016.0469088 kg). All three are listed so you can compare them side by side.