How to convert pounds to kilograms
To convert pounds to kilograms, multiply by 0.45359237. Weight and mass conversions matter for cooking, shipping, fitness tracking, medicine and trade.
Pound to Kilogram conversion table
| Pound (lb) | Kilogram (kg) |
|---|---|
| 0.1 lb | 0.045359237 kg |
| 0.5 lb | 0.226796185 kg |
| 1 lb | 0.45359237 kg |
| 2 lb | 0.90718474 kg |
| 3 lb | 1.36077711 kg |
| 4 lb | 1.81436948 kg |
| 5 lb | 2.26796185 kg |
| 10 lb | 4.5359237 kg |
| 20 lb | 9.0718474 kg |
| 25 lb | 11.33980925 kg |
| 50 lb | 22.6796185 kg |
| 100 lb | 45.359237 kg |
| 500 lb | 226.796185 kg |
| 1,000 lb | 453.59237 kg |
About the units
Pound (lb)
The international avoirdupois pound is defined as exactly 0.45359237 kilograms.
Kilogram (kg)
The kilogram is the SI base unit of mass, defined through the Planck constant since 2019.
How to use this converter
- Type the number of pounds (lb) in the input box.
- The result in kilograms appears instantly — no button needed.
- See the same value in every other weight unit just below.
- Use “Swap units” to convert kilograms back to pounds.
Tips for better results
- Double-check which system a unit belongs to (for example US vs UK gallons).
- Use the swap button to convert in the opposite direction instantly.
- Bookmark the conversions you use most — each pair has its own page.
Frequently asked questions
How many kilograms are in one pound?
One pound equals 0.45359237 kilograms. 0.45359237 is the exact factor used by this converter.
How do I convert pounds to kilograms?
Multiply the value in pounds by 0.45359237. To go the other way, multiply kilograms by 2.20462262185.
What is 10 lb in kg?
10 lb = 4.5359237 kg. Also, 5 lb = 2.26796185 kg and 100 lb = 45.359237 kg.
What is the difference between a pound and a kilogram?
The international avoirdupois pound is defined as exactly 0.45359237 kilograms. The kilogram is the SI base unit of mass, defined through the Planck constant since 2019.
Is this tool free and private?
Yes — the Pound to Kilogram is completely free with no sign-up, and it runs entirely in your browser, so the values you enter are never uploaded to our servers.
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