Convert pounds to kilograms instantly. Enter a value below, or use the formula and reference table further down the page.
In practice
Pound-to-kilogram is the conversion most of the world needs when reading American recipes, fitness content, or product specs, since the US is one of the few countries that hasn't adopted the metric system for everyday weight. The exact relationship (1 lb = 0.45359237 kg) has been fixed since 1959 — it's not an estimate. For anything precise, like a recipe or a medication dose, note that this converter gives the exact figure; some sources round to 0.45kg for convenience, which is close enough for cooking but not for anything requiring accuracy.
How to convert pounds to kilograms
Multiply the value by 0.45359237.
kg = lb × 0.45359237Example: 10 lb = 4.5359 kg.
Pounds to Kilograms conversion table
| Pounds (lb) | Kilograms (kg) |
|---|---|
| 1 lb | 0.4536 kg |
| 2 lb | 0.9072 kg |
| 3 lb | 1.3608 kg |
| 4 lb | 1.8144 kg |
| 5 lb | 2.268 kg |
| 10 lb | 4.5359 kg |
| 15 lb | 6.8039 kg |
| 20 lb | 9.0718 kg |
| 25 lb | 11.3398 kg |
| 50 lb | 22.6796 kg |
| 100 lb | 45.3592 kg |
Frequently asked questions
How many kilograms is 1 pound?
1 pound equals 0.4536 kilograms.
What is the formula to convert lb to kg?
To convert lb to kg, multiply the value by 0.45359237. The full formula is: kg = lb × 0.45359237.
How do I convert kilograms back to pounds?
Use the same calculator above and type your value into the kilograms field instead — it converts in both directions. Or use the reverse formula: lb = kg ÷ 0.45359237.
Is the lb to kg conversion exact?
The conversion factor used here (0.45359237) is the standard internationally defined value. Results on this page are rounded to four decimal places for readability.