Pounds to kilograms
1 pound = 0.453592 kilograms
Type a value in pounds (lb) to get kilograms (kg) straight away. A pound is smaller than a kilogram, so the number goes down. Both units belong to weight, measured here against the kilogram.
1 lb = 0.45359237 kg
Formula
kg = lb × 0.45359237
One pound is 0.45359237 kilograms, so multiply by that factor. You can also divide by 2.20462, the number of pounds in one kilogram. Here lb is the value in pounds and kg is the result in kilograms.
Worked example: 150 pounds × 0.45359237 = 68.0389 kilograms.
Pounds to kilograms table
| pounds (lb) | kilograms (kg) |
|---|---|
| 1 lb | 0.453592 kg |
| 2 lb | 0.907185 kg |
| 3 lb | 1.36078 kg |
| 4 lb | 1.81437 kg |
| 5 lb | 2.26796 kg |
| 6 lb | 2.72155 kg |
| 7 lb | 3.17515 kg |
| 8 lb | 3.62874 kg |
| 9 lb | 4.08233 kg |
| 10 lb | 4.53592 kg |
| 15 lb | 6.80389 kg |
| 20 lb | 9.07185 kg |
| 25 lb | 11.3398 kg |
| 30 lb | 13.6078 kg |
| 40 lb | 18.1437 kg |
| 50 lb | 22.6796 kg |
| 60 lb | 27.2155 kg |
| 75 lb | 34.0194 kg |
| 100 lb | 45.3592 kg |
Everyday pounds in kilograms
| What it is | lb | kg |
|---|---|---|
| a block of butter (US) | 1 lb | 0.453592 kg |
| a newborn baby (about) | 8 lb | 3.62874 kg |
| a common checked-bag limit | 50 lb | 22.6796 kg |
| an adult body weight | 150 lb | 68.0389 kg |
| a heavy adult | 200 lb | 90.7185 kg |
Quick estimate in your head
Multiply by about 0.45. For 150 lb that gives 67.5 kg against an exact 68.0389 kg, an error of 0.8%.
About the units
Pound (lb). The avoirdupois pound, exactly 0.45359237 kg. Used for body weight in the US.
Kilogram (kg). The SI base unit of mass, defined through the Planck constant since 2019.
Going the other way, 1 kilogram is 2.20462 pounds.
Questions
How many kilograms are in 1 pound?
1 pound is 0.453592 kilograms, and 1 kilogram is 2.20462 pounds.
How do I convert pounds to kilograms?
Use kg = lb × 0.45359237. For example, 150 pounds × 0.45359237 = 68.0389 kilograms.
Is the pound to kilogram factor exact?
Yes, the definitions are exact, so the factor is exact. Results here are rounded to 6 significant digits for display.
How much is a heavy adult in kilograms?
200 lb is 90.7185 kg.
Source for the conversion factor: NIST SP 811, Appendix B (conversion factors).
Related conversions
- kilograms to pounds
- kilograms to grams
- grams to kilograms
- pounds to ounces
- stones to kilograms
- kilograms to stones