Weight converter
Type a weight, choose the units, and see the result and the same weight in every common unit. The pound is defined as exactly 0.45359237 kg, so the factors carry no rounding.
Runs in your browser: nothing you enter is sent anywhere.
How to use it
- Type a number. A dot or a comma works as the decimal separator.
- Choose the unit you have and the unit you need. The ⇄ button swaps them.
- The table below shows the same weight in all common units at once.
Conversion factors
Every unit is converted through the kilogram. The pound has an exact metric definition, and the ounce, stone and tons are fixed multiples of the pound, so the factors themselves are not rounded.
| Unit |
In kilograms |
| 1 ounce (oz) |
0.028349523125 kg |
| 1 pound (lb) = 16 oz |
0.45359237 kg |
| 1 stone (st) = 14 lb |
6.35029318 kg |
| 1 US short ton = 2,000 lb |
907.18474 kg |
| 1 UK long ton = 2,240 lb |
1,016.0469088 kg |
| 1 metric ton (tonne) |
1,000 kg |
To convert between two units, multiply by the first unit’s factor and divide by the second’s: 1 st = 6.35029318 ÷ 0.45359237 = 14 lb.
Worked example
A person weighs 70 kg. In pounds that is 70 ÷ 0.45359237 = 154.32 lb. In stones and pounds: 154.32 ÷ 14 = 11.02, so 11 st 0.3 lb, about 11 st.
A recipe asks for 5 lb 8 oz of potatoes. That is 5.5 lb × 0.45359237 = 2.49 kg.
Quick reference
- 1 kg ≈ 2.2046 lb ≈ 35.274 oz
- 1 lb = 453.59237 g, 1 oz ≈ 28.35 g
- 100 g ≈ 3.527 oz
- 1 US ton ≈ 0.9072 tonne
Frequently asked questions
How many pounds are in a kilogram?
One kilogram is about 2.2046 pounds, because a pound is exactly 0.45359237 kg. To convert, multiply kilograms by 2.2046 or divide by 0.45359237.
How many ounces are in a pound?
Sixteen. This converter treats ounces as avoirdupois ounces (1 oz = 28.349523125 g), the ones used for body weight, food and parcels. Troy ounces for precious metals are different and are not included.
What is a stone in kilograms?
A stone is 14 pounds, which is exactly 6.35029318 kg. It is still used for body weight in the UK and Ireland.
What is the difference between a metric ton and a US ton?
A metric ton (tonne) is 1,000 kg. A US short ton is 2,000 pounds, or 907.18474 kg. A UK long ton is 2,240 pounds, or 1,016.0469088 kg.
Is weight the same as mass?
Strictly, kilograms and pounds measure mass; weight is the force of gravity on that mass. In everyday use, and on any scale, the two words are used for the same quantity, and that is what this tool converts.