Pounds to Kilograms
Type pounds (lb), see kilograms (kg).
Type a number above to see the answer.
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How to convert pounds to kilograms
To change pounds into kilograms, multiply by 0.45359237.
kilograms = pounds × 0.45359237
Going the other way: pounds = kilograms × 2.204622621849
1 pound = 0.45359237 kilograms. This factor is the exact definition of the unit, not a rounded estimate.
Worked example
You have 150 pounds. Multiply by 0.45359237: 150 × 0.45359237 = 68.0389 kg .
Pounds to kilograms conversion table
| Pounds (lb) | Kilograms (kg) |
|---|---|
| 1 lb | 0.4536 kg |
| 5 lb | 2.268 kg |
| 10 lb | 4.5359 kg |
| 20 lb | 9.0718 kg |
| 50 lb | 22.6796 kg |
| 80 lb | 36.2874 kg |
| 100 lb | 45.3592 kg |
| 120 lb | 54.4311 kg |
| 140 lb | 63.5029 kg |
| 150 lb | 68.0389 kg |
| 160 lb | 72.5748 kg |
| 180 lb | 81.6466 kg |
| 200 lb | 90.7185 kg |
| 250 lb | 113.3981 kg |
One exact number, no rounding needed
1 pound is defined as exactly 0.45359237 kilograms, agreed internationally in 1959. It is not an estimate.
The quick "halve it and take off a bit" trick gets you close, but the number above is the exact one.
Frequently asked questions
How many kilograms is 1 pound?
1 pound is exactly 0.45359237 kg.
Why is the pound-to-kilogram conversion factor so exact?
Because the pound was formally redefined in 1959 as exactly 0.45359237 kilograms by international agreement — it is not a rounded estimate.
How do I convert my body weight from lbs to kg?
Use the same formula as above. For example, 165 lb is about 74.84 kg.
How many pounds is 100 kg?
100 kg is about 220.46 lb.
Related converters
- Kilograms to Pounds kg → lb
- Pounds to Ounces lb → oz
- Grams to Pounds g → lb
- All weight converters How heavy something is — pounds, kilograms, grams and ounces.
Every factor on this page is listed in our conversion methodology.