How to use the pounds to kilograms converter
Enter pounds and multiply by 0.45359237 to convert to kilograms.
Pounds to kilograms
One international avoirdupois pound is defined as exactly 0.45359237 kilogram.
Example: James converts a luggage weight
James weighs a suitcase at 50 pounds. Multiplying by the exact factor 0.45359237 gives 22.6796185 kilograms, usually rounded to 22.68 kg.
This uses the international avoirdupois pound, not a troy pound. A rounded display should not be treated as an airline’s acceptance decision at a weight limit.
Use the exact pound conversion factor
Multiply pounds by 0.45359237 to get kilograms. A 10-pound package is 4.5359237 kg, or about 4.536 kg when rounded to three decimal places.
This converts avoirdupois pounds used for everyday weight. It does not convert troy pounds or apply a shipping provider's rounding rules.
Common pound-to-kilogram conversions
Multiply by exactly 0.45359237. Lb and lbs both refer to pounds in this everyday weight conversion.
| Pounds | Kilograms |
|---|---|
| 1 | 0.4536 |
| 5 | 2.268 |
| 10 | 4.5359 |
| 20 | 9.0718 |
| 50 | 22.6796 |
| 100 | 45.3592 |
| 150 | 68.0389 |
| 200 | 90.7185 |
Assumptions and limitations
What the estimate assumes
Measurement uncertainty is not added to the converted value.
Sources and reference material
Pounds to Kilograms Converter FAQs
How many kilograms are in one pound?
Exactly 0.45359237 kilogram.
What is 100 pounds in kilograms?
About 45.36 kilograms.
Can I use this for package weight?
Yes, when the original weight is in avoirdupois pounds.
Does the converter show grams?
Yes.
Exact unit conversion; displayed decimals may be rounded for readability.