How to Convert Pounds to Kilograms (lb to kg)
Weight units matter at the wet market, where older stalls and Chinese medical halls still quote prices per kati or tael, and when following American recipes in ounces and pounds. This guide shows how to convert pounds into kilograms by hand, with examples and a quick-reference table.
The conversion
To convert pounds to kilograms, multiply the value by 0.45359237. To go the other way, divide by the same number (or multiply by 2.2046226218). For a quick estimate, multiply by about 0.45.
Kilograms = pounds × 0.45359237
Worked examples
- 3 lb = 1.3608 kg
- 12.5 lb = 5.6699 kg
- 75 lb = 34.0194 kg
Pounds to Kilograms table
| Pounds | Kilograms |
|---|---|
| 1 lb | 0.453592 kg |
| 2 lb | 0.907185 kg |
| 5 lb | 2.268 kg |
| 10 lb | 4.5359 kg |
| 20 lb | 9.0718 kg |
| 25 lb | 11.3398 kg |
| 50 lb | 22.6796 kg |
| 100 lb | 45.3592 kg |
| 250 lb | 113.3981 kg |
| 500 lb | 226.7962 kg |
| 1,000 lb | 453.5924 kg |
Common questions
Is lb to kg exact?
The factors used here are the internationally defined values where they exist; results are rounded for display only.
How do I convert back?
Use the Kilograms to Pounds converter.
Mistakes to avoid
Mixing similar-sounding units
US and imperial gallons, pints and tons are different sizes, and decimal kilobytes differ from binary kibibytes.
Forgetting squared and cubed units
Area and volume factors are the length factor squared or cubed, so 1 m² is about 10.76 sq ft, not 3.28.
Multiplying when you should divide
Converting to a smaller unit gives a bigger number, and converting to a larger unit gives a smaller one. If your answer moves the wrong way, you have inverted the factor.
Background
Writing the units next to every number while you work is the simplest way to avoid mistakes. If the units do not cancel to leave the one you want, the calculation is set up wrongly.
Singapore adopted the metric system in the 1970s, replacing imperial units and traditional Chinese measures in most official uses. Metric units are now standard in schools, trade and government, but older units survive in property, markets and imported goods.
Unit conversion is simply multiplication by a fixed ratio. The ratio between two units of the same quantity never changes, so once you know it you can convert any value in either direction.
For any value, use the Pounds to Kilograms Converter or browse all weight converters.
Run your own numbers: Pounds to Kilograms Converter