Weight & Mass Converter
Enter a weight in any unit to see it in metric and imperial units at once.
How to use it
- Enter an amount Type the weight you want to convert.
- Choose the starting unit Select it in the "From" menu.
- Read the conversions All other units update instantly.
Examples
| 1 pound | 453.6 g |
|---|---|
| 70 kilograms | 154.3 lb |
| 1 ounce | 28.35 g |
About this tool
Strictly, “weight” and “mass” are different physical quantities, but in everyday use people convert between units like kilograms and pounds — and that is what this tool does.
The factors are exact by international definition: a pound is precisely 0.45359237 kg and an ounce is one-sixteenth of that. The converter covers metric units (tonnes down to micrograms), the avoirdupois units used in the US and UK (pounds, ounces, stones, US tons) and the carat used for gemstones. It runs entirely in your browser.
Frequently asked questions
How many grams are in a pound?
Exactly 453.59237 g. A pound is defined as 0.45359237 kilograms.
How many pounds are in a stone?
A stone is 14 pounds, a unit still common in the UK and Ireland for body weight.
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Updated June 12, 2026