A kilogram is the SI base unit of mass. An international avoirdupois pound is defined as exactly 0.45359237 kilograms.
The formula
How to use it
To convert 100 kilograms, divide 100 by 0.45359237. The result is approximately 220.4622622 pounds. For a quick estimate, multiply kilograms by 2.2. That shortcut is useful for mental arithmetic, but retain the exact factor for shipping, engineering and detailed records. To reverse the calculation, multiply pounds by 0.45359237.
Related measurement tools
Check the result
Keep intermediate digits until the end, then round to the precision appropriate for the original measurement. Converting to a different unit does not make an imprecise measurement more accurate. Try the linked tool for a reference table and a comparison with related units.
Open converter →Definition references: NIST Guide to the SI and BIPM SI Brochure.