Weight & Mass Converter
Convert body weight, ingredients, parcels and freight between metric and imperial units. Ounces, pounds and stone here are avoirdupois units, the system used for everyday weights in the US and the UK.
pounds
1 kg = 2.2046 lb
Popular weight conversions
Units in this converter
| Unit | Symbol | Equals (in kilograms) |
|---|---|---|
| Milligram | mg | 0.000001 kg |
| Gram | g | 0.001 kg |
| Kilogram | kg | 1 kg |
| Metric ton (tonne) | t | 1,000 kg |
| Ounce | oz | 0.028349523125 kg |
| Pound | lb | 0.45359237 kg |
| Stone | st | 6.35029318 kg |
Weight or mass?
Strictly speaking, kilograms and pounds measure mass, while weight is the force gravity exerts on that mass. In everyday use the two words mean the same thing, and on Earth a scale reading in kilograms or pounds is a mass reading.
The pound is defined as exactly 0.45359237 kg, so conversions between pounds, ounces, stone and metric units are exact.
About the units
- Milligram (mg)
- The milligram is one thousandth of a gram. Medication doses and the vitamin, mineral and sodium figures on nutrition labels are usually given in milligrams.
- Gram (g)
- The gram is one thousandth of a kilogram. It is the standard unit for food packaging, metric recipes and postage weights.
- Kilogram (kg)
- The kilogram is the SI base unit of mass. Since 2019 it has been defined by a fixed value of the Planck constant, replacing the metal prototype cylinder kept near Paris since 1889.
- Metric ton (tonne) (t)
- The metric ton, or tonne, equals 1,000 kilograms. It is not the same as the US short ton (2,000 pounds, about 907 kg) or the UK long ton (2,240 pounds, about 1,016 kg).
- Ounce (oz)
- The avoirdupois ounce is 1/16 of a pound, exactly 28.349523125 grams. It differs from the troy ounce (about 31.1 g) used for precious metals and from the fluid ounce, which measures volume rather than weight.
- Pound (lb)
- The avoirdupois pound is defined as exactly 0.45359237 kilograms and is divided into 16 ounces. It is the everyday unit for body weight and groceries in the US, and is often abbreviated "lbs".
- Stone (st)
- The stone equals 14 pounds, about 6.35 kilograms. It is used mainly in the UK and Ireland for body weight, usually combined with pounds, as in "11 st 6 lb".
Frequently asked questions
Does this converter use troy ounces?
No. The ounce here is the avoirdupois ounce (28.35 g) used for food and everyday items. Troy ounces (31.10 g) are only used for precious metals.
Is a metric ton the same as a US ton?
No. A metric ton (tonne) is 1,000 kg. A US short ton is 2,000 lb (about 907 kg), and a UK long ton is 2,240 lb (about 1,016 kg).