Pounds to Kilograms
1 pound = 0.45359 kilograms · 1 kg = 2.2046 lb
1 pound = 0.45359 kilograms
How it’s calculated
kg = lb × 0.45359237
- Multiply the value in pounds by 0.45359237.
- To go back, divide by 0.45359237 (or multiply by 2.204622622).
- 1 lb = 0.45359237 kg · 1 kg = 2.204622622 lb
Show worked solutionFactor, unit cancellation and rounding, step by step
Find the conversion factor
By definition 1 lb = 0.45359237 kg. Source: NIST SP 811 / Handbook 44; BIPM SI Brochure (9th ed.).
Multiply by the factor written as a fraction
Put lb in the denominator so it cancels, leaving kg.
Calculate (unrounded)
Round the answer
Rounded to 5 significant figures.
Answer: 0.45359 kg
1 lb in other units
Batch convert lb → kg
- 1 lb = 0.45359 kg
- 5 lb = 2.268 kg
- 10 lb = 4.5359 kg
- 25 lb = 11.34 kg
Quick examples
- 1 pound = 0.45359 kilograms
- 5 pounds = 2.268 kilograms
- 10 pounds = 4.5359 kilograms
- 25 pounds = 11.34 kilograms
- 100 pounds = 45.359 kilograms
About these units
Pound (lb)
US & imperial (identical)
Avoirdupois pound, exactly 0.453 592 37 kg (1959).
1 lb = 0.45359237 kg
Source: NIST SP 811 / Handbook 44
Kilogram (kg)
SI (metric)
SI base unit of mass, defined by fixing the Planck constant.
Base unit
Source: BIPM SI Brochure (9th ed.)
Pounds to kilograms conversion table
| Pounds (lb) | Kilograms (kg) |
|---|---|
| 0.1 lb | 0.045359 kg |
| 0.5 lb | 0.2268 kg |
| 1 lb | 0.45359 kg |
| 2 lb | 0.90718 kg |
| 3 lb | 1.3608 kg |
| 4 lb | 1.8144 kg |
| 5 lb | 2.268 kg |
| 6 lb | 2.7216 kg |
| 7 lb | 3.1751 kg |
| 8 lb | 3.6287 kg |
| 9 lb | 4.0823 kg |
| 10 lb | 4.5359 kg |
| 15 lb | 6.8039 kg |
| 20 lb | 9.0718 kg |
| 25 lb | 11.34 kg |
| 30 lb | 13.608 kg |
| 40 lb | 18.144 kg |
| 50 lb | 22.68 kg |
| 75 lb | 34.019 kg |
| 100 lb | 45.359 kg |
| 250 lb | 113.4 kg |
| 500 lb | 226.8 kg |
| 1,000 lb | 453.59 kg |
Related conversions
Frequently asked questions
How do I convert pounds to kilograms?
Use kg = lb × 0.45359237. Multiply the value in pounds by 0.45359237.
How many kilograms are in 1 pound?
1 pound (lb) equals 0.45359 kilograms (kg); more precisely 0.45359237.
How many pounds are in 1 kilogram?
1 kilogram (kg) equals 2.2046 pounds (lb); more precisely 2.204622622.
What is 10 lb in kg?
10 pounds = 4.5359 kilograms.
What is a pound?
Avoirdupois pound, exactly 0.453 592 37 kg (1959).
What is a kilogram?
SI base unit of mass, defined by fixing the Planck constant.
Formula: kg = lb × 0.45359237. Factors last reviewed 2026-10-27.