Pounds to Kilograms Converter
Convert pounds (lb) to kilograms (kg), see the exact formula, and learn how both units measure mass.
Let’s convert it.
Swap unitsDecimals welcome. The answer updates as you type.
10 lb × 0.45359237 ≈ 4.535924 kg
Understanding pounds and kilograms
To convert pounds to kilograms, multiply by 0.45359237. The amount of matter stays the same; only the unit used to describe it changes.
What are pounds (lb)?
A pound (lb) is a customary unit of mass used in the United States. One international avoirdupois pound is exactly 0.45359237 kilograms.
What are kilograms (kg)?
A kilogram (kg) is the SI base unit of mass. It contains 1,000 grams and is commonly used for body mass, luggage, and groceries.
How to use this converter
- Enter the number of pounds, including any decimal part.
- Read the equivalent number of kilograms.
- Choose a sensible number of decimal places for your measurement.
The conversion formula
kilograms = pounds × 0.45359237
A worked example
A 10 lb package has a mass of 10 × 0.45359237 = 4.5359237 kg, or about 4.54 kg.
A shipping label may show pounds while a luggage limit uses kilograms. Convert the measured mass before comparing it with the limit, and round only the final result.
Quick conversion table
Values are rounded for readability.
| pounds (lb) | kilograms (kg) |
|---|---|
| 1 | 0.453592 |
| 5 | 2.267962 |
| 10 | 4.535924 |
| 25 | 11.339809 |
| 50 | 22.679619 |
| 100 | 45.359237 |
Common questions
How many kilograms are in one pound?
Exactly 0.45359237 kg.
Can I divide pounds by 2.2?
That gives a rough estimate. Multiply by 0.45359237 when you need a more accurate conversion.
Is lb the same as lbs?
Both labels commonly mean pounds. The standard unit symbol is lb, for either one pound or several.