Pound to Kilogram Converter
Converts pound to kilogram (lb to kg) and back. The conversion factor is shown below every result.
How to Convert Pound to Kilogram
What Is a Pound?
The avoirdupois pound (lb), used in both US customary and imperial systems, is fixed at exactly 0.45359237 kilograms.
What Is a Kilogram?
A kilogram (kg) is the base SI unit for mass.
Common Pound to Kilogram Reference Points
Real-world reference values for quick sanity checks.
| Item | Pound (lb) | Kilogram (approx.) |
|---|---|---|
| A checked airline bag limit | 50 lb | 22.7 kg |
| A gallon of water (approx.) | 8.34 lb | 3.78 kg |
| An adult golden retriever | 65 lb | 29.5 kg |
| Reference values are illustrative approximations for common items, not measured specifications. | ||
Pound to Kilogram Conversion Table
| Pound (lb) | Kilogram (kg) |
|---|---|
| 1 lb | 0.453592 kg |
| 5 lb | 2.267962 kg |
| 10 lb | 4.535924 kg |
| 20 lb | 9.071847 kg |
| 50 lb | 22.679619 kg |
| 75 lb | 34.019428 kg |
| 100 lb | 45.359237 kg |
| 150 lb | 68.038855 kg |
| 200 lb | 90.718474 kg |
| 250 lb | 113.398093 kg |
| Source: NIST SP 811, Appendix B (1 lb = 0.45359237 kg exactly) | |
Frequently Asked Questions
How do I convert pounds to kilograms?
Multiply the pound value by 0.45359237. For example, 150 lb × 0.45359237 = 68.038856 kg.
Is 1 lb exactly 0.45359237 kg, or is that rounded?
It's exact. The avoirdupois pound was defined as precisely 0.45359237 kilograms in the 1959 International Yard and Pound Agreement, so this conversion carries no rounding error in the factor itself.
How do I convert my body weight from pounds to kilograms?
Multiply your weight in pounds by 0.45359237. Many gym scales and medical charts outside the US display kilograms, so this same factor applies directly.
Related Weight & Mass Converters
A good measuring tool marked in both lb and kg removes the guesswork at the point of use.