Weight and Mass Converter

Convert any common weight or mass unit and see the value in all the others at once.

Weight Converter

Your result will appear hereStart typing and it updates instantly.

Formula

  • value in target unit = value × (kg per source unit) ÷ (kg per target unit)
  • 1 lb = 0.45359237 kg exactly
  • 1 oz = 28.349523125 g
  • 1 stone = 14 lb
  • 1 quintal = 100 kg

Convert to kilograms, then to the unit you want.

Worked example

100 kg in pounds

Value
100
From
Kilogram (kg)
To
Pound (lb)

Kilogram to Pound

220.462262185 lb

In words: 100 kg = 220.462262185 lb

How it works

The international pound is defined as exactly 0.45359237 kilograms, and an ounce is one sixteenth of a pound (28.349523125 g). Everyday “weight” is really mass, which is what these units measure; the difference only matters when you leave Earth.

Three units trip people up: the UK stone is 14 pounds (6.35 kg), the “ton” is ambiguous — a US short ton is 907 kg, a UK long ton 1,016 kg and a metric tonne 1,000 kg, and all three are listed separately — and the quintal used in Indian agriculture is 100 kg. The carat (200 mg) is for gemstones. For length use Length Converter; to convert recipe volumes see Volume Converter.

Assumptions and limits

  • Troy ounces and other precious-metal units aren't included.