How to convert pounds to kilograms
Enter a weight in pounds and see it in kilograms immediately. The result updates as you type, and you can swap the units or copy the answer.
The pound is defined as exactly 0.45359237 kg, so every result is exact; only the rounding you choose changes what is displayed.
1 pound = 0.45359237 kilograms
Formula: kilograms = pounds × 0.45359237
- Multiply the number of pounds by 0.45359237.
- For a quick estimate in your head, halve the pounds and then take off 10% of that half: 150 lb halves to 75, minus 7.5 is 67.5 kg, close to the exact 150 lb = 68.0 kg.
Common conversions
| Pounds (lb) | Kilograms (kg) |
|---|---|
| 1 lb | 0.453592 kg |
| 5 lb | 2.26796 kg |
| 10 lb | 4.53592 kg |
| 25 lb | 11.3398 kg |
| 50 lb | 22.6796 kg |
| 100 lb | 45.3592 kg |
| 150 lb | 68.0389 kg |
| 200 lb | 90.7185 kg |
Values are computed by the same converter as above, rounded to six significant digits. Need the other direction? See Kilograms to Pounds.
Worked examples
Body weight
A body weight of 150 lb: 150 lb = 68.0 kg.
A gym plate
A standard 45 lb barbell plate is 45 lb = 20.41 kg. That is why plates marked 20 kg and 45 lb are not interchangeable when you are loading a bar.
A baggage limit
A 50 lb airline limit is 50 lb = 22.68 kg, a little under the 23 kg that many other airlines allow.
Things to keep in mind
- Pounds here are units of mass. The pound-force (lbf), a unit of force, is in the force converter.
- There are 16 ounces in a pound. Use the weight converter to change ounces directly.
- A negative weight has no meaning, so the converter rejects it.