Weight Converter

How to use the weight converter

1. Type the weight you want to convert.
2. Choose the unit you are converting from and the unit you want to convert to.
3. The answer appears as you type, along with the same weight in every other unit on the page. Use Swap units to reverse the conversion.

Units and exact values

All conversions go through the kilogram. The pound is defined exactly as 0.45359237 kilograms, and the other imperial and US units are built from it, so the conversion factors are exact.

• 1 pound = 0.45359237 kilograms (16 ounces)
• 1 ounce = 28.349523125 grams
• 1 stone = 14 pounds, about 6.35029318 kilograms
• 1 US ton (short ton) = 2,000 pounds, about 907.18474 kilograms
• 1 UK ton (long ton) = 2,240 pounds, about 1,016.0469088 kilograms
• 1 metric ton (tonne) = 1,000 kilograms
• 1 carat = 200 milligrams (0.0002 kilograms)
• 1 kilogram = 1,000 grams, 1 gram = 1,000 milligrams, 1 milligram = 1,000 micrograms

Common conversions

• 1 kilogram is about 2.2046 pounds.
• 1 pound is about 453.59 grams.
• 1 ounce is about 28.35 grams.
• 1 stone is exactly 14 pounds.
• 1 metric ton is about 2,204.6 pounds.

Good to know

• Weight and mass: in everyday use, “weight” and “mass” are used for the same thing. Strictly, these units measure mass, which does not change from place to place.
• Which ton? A metric ton, a US ton and a UK ton are three different sizes. Check which one your source means.
• Ounces: this tool uses the avoirdupois ounce, the one used for everyday goods. Troy ounces, used for gold and silver, are heavier and are not included.
• Rounding: results are shown to about 10 significant digits. Very large and very small results appear in scientific notation, such as 1.5e-9.
• Numbers: you can type commas, such as 1,250, and negative numbers are allowed.

Is it private?

Yes. Every conversion happens in your web browser. The numbers you enter are never uploaded or stored, and this tool needs no outside libraries.