Weight Converter
Weight in the United States is measured in ounces, pounds and short tons; the rest of the world uses grams, kilograms and metric tons. All conversions here use the international avoirdupois pound of exactly 0.45359237 kilograms.
Weight Conversions
- Pounds to Kilograms 1 pound = 0.45359237 kilograms
- Kilograms to Pounds 1 kilogram = 2.20462 pounds
- Ounces to Grams 1 ounce = 28.3495 grams
- Grams to Ounces 1 gram = 0.035274 ounces
- Stones to Pounds 1 stone = 14 pounds
- Pounds to Stones 1 pound = 0.0714286 stones
- Stones to Kilograms 1 stone = 6.35029318 kilograms
- Kilograms to Stones 1 kilogram = 0.157473 stones
Common Weight Questions
- How Many Ounces in a Pound? There are exactly 16 ounces in one pound.
- How Many Grams in an Ounce? There are 28.349523125 grams in one ounce, usually rounded to 28.35 grams.
- How Many Pounds in a Kilogram? There are 2.20462 pounds in one kilogram.
- How Many Pounds in a Stone? There are exactly 14 pounds in one stone.
Weight Units
Gram (g)
A gram is one thousandth of a kilogram, roughly the weight of a paperclip. Nutrition labels worldwide, and increasingly American baking recipes, are written in grams.
Kilogram (kg)
The kilogram is the SI base unit of mass, redefined in 2019 in terms of the Planck constant. The pound is now legally defined as exactly 0.45359237 kilograms.
Metric ton (t)
A metric ton, also spelled tonne, is exactly 1,000 kilograms. It is about 10 percent heavier than the US short ton, which is why shipping and commodity figures always state which ton they mean.
Ounce (oz)
An avoirdupois ounce is one sixteenth of a pound, or exactly 28.349523125 grams. Do not confuse it with the fluid ounce, which measures volume, not weight.
Pound (lb)
The pound is exactly 0.45359237 kilograms and contains 16 ounces. It is the standard American unit for body weight, groceries and shipping.
Stone (st)
A stone is 14 pounds, or about 6.35 kilograms. It is still the normal way to state body weight in the United Kingdom and Ireland, but it is not used in the United States.
Ton (tn)
The US short ton is 2,000 pounds, or about 907.18 kilograms. When an American source says "ton" without qualification, this is almost always the unit meant.
Every weight value on this site is derived from the kilogram using exact definitions from NIST Special Publication 811, Appendix B. See how we calculate.