Pounds to Kilograms
A pound is 0.45359237 kilograms exactly — a definition rather than a measurement, agreed internationally in 1959. So halving and taking off ten per cent is a good mental shortcut: 150lb halved is 75, less 10% is 67.5, against a true 68.04.
The rows below include the weights that actually get looked up: the 50lb bag limit most US airlines use, the 45lb Olympic barbell, and the typical adult range.
If you are working in stones as well, note that a stone is 14 pounds exactly, so 11st 4lb is 158lb and 71.67kg.
The formula
kilograms = pounds ÷ 2.20462262
Pounds to Kilograms table
| Pounds | Kilograms |
|---|---|
| 1 | 0.45359237 |
| 5 | 2.26796185 |
| 10 | 4.5359237 |
| 20 | 9.0718474 |
| 45 | 20.4116567 |
| 50 | 22.6796185 |
| 100 | 45.359237 |
| 150 | 68.0388555 |
| 200 | 90.718474 |