How to convert pounds to kilograms
Useful when converting customary mass measurements to SI. CalcOS converts through the kilogram and keeps the exact international pound definition until display rounding.
kg = lb × 0.45359237
Worked example: 25 lb = 11.33980925 kg.
pounds to kilograms conversion table
| pound (lb) | kilogram (kg) |
|---|---|
| 1 | 0.45359237 |
| 5 | 2.26796185 |
| 10 | 4.5359237 |
| 16 | 7.25747792 |
| 25 | 11.33980925 |
| 100 | 45.359237 |
Mass is not force
Kilograms, grams, pounds, and ounces measure mass. Weight is technically the force gravity exerts on a mass and is measured in newtons in SI. Everyday language often says “weight converter,” but this calculator preserves the correct mass quantity.
Avoirdupois units
These pages use the international avoirdupois pound and ounce used for common goods and body mass. Troy ounces, used for precious metals, are a different unit and are not silently substituted.
Related mass conversions
- Kilograms to Pounds Converter
- Grams to Ounces Converter
- Ounces to Grams Converter
- Pounds to Ounces Converter
Sources: BIPM SI Brochure and NIST Handbook 44, Appendix C. See the complete Weight and Mass guide.