pounds to kilograms converter
1 lb = 0.45359237 kg. Type a value in either box — the other side updates instantly, using the exact definition factor, not a rounded shortcut. Airline baggage allowances and medical charts outside the US are written in kilograms, while US scales report pounds.
Rate: 1 lb = 0.45359237 kg · 1 kg = 2.2046226219 lb
Formula and a worked example
kilograms = pounds × 0.45359237. Worked example: 150 lb × 0.45359237 = 68.038855 kg. To go back, divide by the same factor (or multiply by 2.2046226219).
Where the factor comes from: The pound is defined as exactly 0.45359237 kilograms. Factors on UnitPairs follow the NIST definitions, so results agree between pages to the last digit shown.
pounds to kilograms chart
| pounds (lb) | kilograms (kg) |
|---|---|
| 1 | 0.453592 |
| 5 | 2.267962 |
| 10 | 4.535924 |
| 20 | 9.071847 |
| 50 | 22.679619 |
| 100 | 45.359237 |
| 150 | 68.038855 |
| 200 | 90.718474 |
| 250 | 113.398093 |
| 300 | 136.077711 |
Questions
How many kilograms are in one pound?
Exactly 0.45359237 kg — that is the rate this converter applies in both directions.
How do I convert lb to kg by hand?
Multiply the pounds value by 0.45359237. For a rough mental estimate, 0.454 is usually close enough — but use the full factor for anything you plan to build, buy or dose.
How accurate is this converter?
The factors are the exact international definitions, so the only rounding is in the display — results are shown to six decimal places, and the underlying value is never pre-rounded.
Related conversions
- kilograms to pounds — the reverse of this page
- kilograms to pounds
- grams to ounces
- ounces to grams
- kilograms to stone
- Height converter — centimetres to feet and inches
- Full conversion chart — every pair on one page