Pounds and kilograms are both weight or mass units. Pounds are common in the US system, while kilograms are part of the metric system.
Use the calculator first, then read the guide below to understand the formula and examples.
Direct answer
To convert pounds to kilograms, multiply pounds by 0.45359237.
Formula
Kilograms = pounds × 0.45359237.
Example
If a weight is 100 pounds, multiply 100 by 0.45359237. The result is about 45.36 kilograms.
Quick estimate
For a rough mental estimate, divide pounds by 2.2. This is not exact, but it is close enough for many everyday uses.
Common mistake
Do not multiply by 2.2 when converting pounds to kilograms. Multiplying by 2.2 is used when converting kilograms to pounds.
FAQs
How many kilograms are in one pound?
One pound equals about 0.4536 kilograms.
Is 220 pounds about 100 kilograms?
Yes. 220 pounds is approximately 99.79 kilograms.
Which is larger, a pound or a kilogram?
A kilogram is larger. One kilogram is about 2.2046 pounds.