Density and Mass
lbtokg
Convert pounds (avoirdupois) (lb) to kilograms (kg).
Factor1 lb = 0.4535924 kg
Converter
lb
Accepts numbers or expressions, e.g. 150 + 14.7
Result
kg
Rendered to 6 significant figures.
Formula
Formula
kg = lb × 0.4535924
Multiply any value in pounds (avoirdupois) by 0.4535924 to obtain the value in kilograms.
Worked example
Convert 220 lb to kg.
- 01Start with 220 lb.
- 02Multiply by the conversion factor: 220 × 0.4535924 = 99.7903 kg.
Result220 lb = 99.7903 kg
Conversion table
| lb | kg |
|---|---|
| 1 | 0.45359 |
| 2 | 0.90718 |
| 5 | 2.268 |
| 10 | 4.5359 |
| 20 | 9.0718 |
| 50 | 22.68 |
| 100 | 45.359 |
| 200 | 90.718 |
| 500 | 226.8 |
| 1000 | 453.59 |
Reference values rounded to 5 significant figures for display.
FAQ
What is the conversion factor from lb to kg?
1 lb equals 0.4535924 kg. To convert, multiply the value in pounds (avoirdupois) by 0.4535924.
How do I convert 1 lb to kg?
1 lb = 0.453592 kg. For any value, multiply by 0.4535924.
How do I convert kg back to lb?
Divide by the same factor — or equivalently, multiply by 2.204623. So 1 kg = 2.20462 lb.
When would I need to convert pound (avoirdupois) to kilogram?
Mass conversions appear in material balances, reagent dosing, and reconciling vendor specifications across imperial/metric systems.
Is the conversion exact?
Yes. Both lb and kg are defined by exact SI relationships, so the displayed factor is exact (any rounding shown is only for display).