Weight & Mass Converter
Converts weight and mass between metric and imperial units, including stone — still the everyday unit for body weight in the UK and Ireland. Strictly these are units of mass; weight is a force, but in ordinary use the two are treated as the same thing.
Share sends a link that reopens these numbers. Copy details pastes the full breakdown as a list.
The formula
result = value × (from factor ÷ to factor)
Each weight unit is defined by its size relative to the kilogram, so converting between any two is a single multiplication.
Every weight unit
| Unit | Symbol | In one kilogram |
|---|---|---|
| milligram | mg | 1,000,000 |
| gram | g | 1,000 |
| kilogram | kg | 1 |
| tonne | t | 0.001 |
| ounce | oz | 35.273962 |
| pound | lb | 2.2046226 |
| stone | st | 0.15747304 |
| US ton | ton | 0.0011023113 |
| imperial ton | ton | 0.00098420653 |
Frequently Asked Questions
How many pounds are in a kilogram?
One kilogram is 2.204623 pounds. The pound is defined as exactly 0.45359237 kg, so this factor is exact rather than measured.
How much is a stone in kilograms?
One stone is 14 pounds, or 6.35029 kg. So 11 stone 4 pounds is 158 pounds, about 71.7 kg.
Is a US ton the same as a tonne?
No. A US (short) ton is 2,000 lb = 907.18 kg. A metric tonne is 1,000 kg. An imperial (long) ton is 2,240 lb = 1,016 kg. All three are listed here.