Unit Converter › Guides › Pounds to Kilograms (lb to kg)
Convert pounds to kilograms with the exact factor defined by NIST (0.45359237), a ready table and worked examples.
The international avoirdupois pound is defined as exactly 0.453 592 37 kg.
Kilograms = Pounds × 0.45359237. To convert pounds to kilograms, multiply by 0.45359237.
| Pounds | Kilograms |
|---|---|
| 1 | 0.454 |
| 2 | 0.907 |
| 5 | 2.268 |
| 10 | 4.536 |
| 20 | 9.072 |
| 25 | 11.34 |
| 50 | 22.68 |
| 100 | 45.359 |
| 110 | 49.895 |
| 120 | 54.431 |
| 130 | 58.967 |
| 140 | 63.503 |
| 150 | 68.039 |
| 160 | 72.575 |
| 180 | 81.647 |
| 200 | 90.718 |
| 220 | 99.79 |
| 250 | 113.398 |
| 300 | 136.078 |
Values are rounded to 3 decimal places for display. The factor itself is exact, so any rounding comes only from the last digit shown.
A 150 lb person: 150 × 0.45359237 = 68.039 kg. A 50 lb checked bag: 22.680 kg.
For a rough answer, yes. The exact value is 1 kg ≈ 2.204623 lb, so the 2.2 shortcut is off by about 0.2%.
Last checked: 29 October 2026.