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.
Pounds to kilograms conversion factor
One international avoirdupois pound equals exactly 0.45359237 kilograms. Multiply pounds by 0.45359237 to convert the mass to kilograms.
For everyday use, the displayed result can be rounded to a sensible number of decimal places. The exact conversion factor does not make a scale reading more precise than it was originally measured.
Common pounds-to-kilograms conversions
1 lb
0.45359237 kg.
10 lb
About 4.54 kg.
100 lb
About 45.36 kg.
200 lb
About 90.72 kg.
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.
How do I convert pounds to kilograms?
Multiply pounds by 0.45359237.
Exact unit conversion; displayed decimals may be rounded for readability.