How many kilograms are in one pound?
One pound is 0.4536 kg.
Pounds to Kilograms
Type a value to convert it from pounds to kilograms. One lb equals 0.4536 kg.
Result
Pounds and kilograms, side by side
One pound is 0.4536 kg. In the other direction, one kilogram is 2.205 lb.
The factor is exact rather than rounded: imperial and US units have been defined from the metric ones since 1959, so the conversion introduces no error of its own. What you see below is arithmetic, not an approximation.
The pound has been exactly 0.45359237 kilograms since 1959. It is the everyday unit for body weight and groceries in the United States, and in the United Kingdom it lives on alongside the kilogram, especially for body weight.
The kilogram is the base unit of mass in the International System. Since 2019 it has been defined through the Planck constant, replacing the platinum-iridium cylinder kept near Paris that had been the standard since 1889. A liter of water has a mass of about one kilogram.
| Pound | Kilogram |
|---|---|
| 1 | 0.453592 |
| 5 | 2.26796 |
| 10 | 4.53592 |
| 50 | 22.6796 |
| 70 | 31.7515 |
| 100 | 45.3592 |
Frequently asked questions
How do I convert kilograms back to pounds?
One kilogram is 2.205 lb. The tool above converts in both directions.
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