Pounds to Kilograms
Convert pounds to kilograms.
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Example
150 lb = 68 kg
How it works
Pounds and kilograms are both units used to measure mass, but they belong to different measurement systems. The formula multiplies the number of pounds by 0.4536 because 1 pound is approximately equal to 0.4536 kilograms, so this conversion factor changes the unit without changing the actual amount of mass.
When to use it
Use this when converting body weight, luggage weight, shipping limits, or ingredient amounts from imperial units into metric units. It is especially useful in science, health, travel, and international trade.
Worked example, step by step
Convert 90 lb to kilograms kg = lb × 0.4536 kg = 90 × 0.4536 kg = 40.824 kg ≈ 40.8 kg
Common mistakes to avoid
- multiplying by 2.2046 instead of 0.4536 when converting pounds to kilograms
- forgetting that pounds must be the input value and kilograms are the output
- rounding too early and losing accuracy in the final answer
Did You Know?
The pound's abbreviation "lb" comes from the Latin "libra", the Roman unit of weight.
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