How many kg is 1 pound?
1 pound is exactly 0.45359237 kg, or about 0.454 kg.
Mass and weight conversion
Pounds to kilograms converter calculator
Last updated:
1 pound equals exactly 0.45359237 kilograms. To convert, multiply pounds by 0.453592. 150 lbs is 68.04 kg; 200 lbs is 90.72 kg.
Featured pounds to kilograms converter answer
Pounds
1 lb
kilograms converter
0.4536 kg
Formula: 1 pound = 0.453592 kilograms. Open the live calculator to convert any value.
Formula
1 pound = 0.453592 kilograms
The exact conversion 1 lb = 0.45359237 kg was set in 1959 by the international yard and pound agreement among the US, UK, Canada, Australia, New Zealand, and South Africa.
Common values
| From | To |
|---|---|
| 1 lb | 0.4536 kg |
| 10 lbs | 4.5359 kg |
| 50 lbs | 22.6796 kg |
| 100 lbs | 45.3592 kg |
| 120 lbs | 54.4311 kg |
| 150 lbs | 68.0389 kg |
| 180 lbs | 81.6466 kg |
| 200 lbs | 90.7185 kg |
| 250 lbs | 113.3981 kg |
| 300 lbs | 136.0777 kg |
Background
Pounds you see in everyday US use are avoirdupois pounds. Two other 'pound' systems still appear in specialized work: troy pounds for precious metals (about 0.3732 kg) and apothecaries' pounds in older pharmacy contexts.
Common use cases
- Convert body weight and training loads into kilograms.
- Translate shipping labels and supplier specs into metric mass values.
- Compare recipe or product documentation that switches between pounds and kilograms.
Frequently asked questions
How many kg is 150 lbs?
150 pounds is 68.0389 kilograms.
Quick estimate for lbs to kg?
Divide by 2.2 for a close result. 220 lbs ÷ 2.2 = 100 kg (correct). For precision (medicine, shipping) use the exact 0.453592 factor.
Is the avoirdupois pound the same in the US and UK?
Yes. Since 1959 they have shared the same definition. The UK and Commonwealth countries also use the stone (14 lbs) for body weight, which the US does not.
How many lbs are in a kilogram for medical dosing?
Use 2.20462 for the pounds-per-kg factor and the reciprocal 0.453592 for the kg-per-pound factor when accuracy matters. Many drug doses are calculated per kg of body weight.
More mass conversions
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