How to use Pounds to Kilograms
Type a value in pounds and the kilograms figure appears straight away. The conversion table further down lists common values.
How the pound is defined
The pound (lb) is a unit of mass in the US customary system and the British imperial system. Since 1959 it has been defined as exactly 0.45359237 kilograms, so the conversion is exact rather than an estimate. The kilogram (kg) is the SI unit of mass used almost everywhere else, which is why medical records, science and most food labels outside the United States use it.
A quick mental shortcut
To go from pounds to kilograms in your head, halve the number and take off 10% of the result. 180 lbs halved is 90, minus 9 gives 81 kg, close to the exact 81.65 kg. For a precise figure, use the converter above.
The formula
kg = lb × 0.45359237
Examples
- 1 pounds to kilograms
0.45359237 kg
- 10 pounds to kilograms
4.5359237 kg
- 250 pounds to kilograms
113.3980925 kg
Pounds to Kilograms conversion table
| Pounds | Kilograms |
|---|---|
| 1 | 0.4536 kg |
| 2 | 0.9072 kg |
| 5 | 2.268 kg |
| 10 | 4.5359 kg |
| 20 | 9.0718 kg |
| 25 | 11.3398 kg |
| 50 | 22.6796 kg |
| 100 | 45.3592 kg |
| 110 | 49.8952 kg |
| 120 | 54.4311 kg |
| 130 | 58.967 kg |
| 140 | 63.5029 kg |
| 150 | 68.0389 kg |
| 160 | 72.5748 kg |
| 170 | 77.1107 kg |
| 180 | 81.6466 kg |
| 190 | 86.1826 kg |
| 200 | 90.7185 kg |
| 220 | 99.7903 kg |
| 250 | 113.3981 kg |
| 300 | 136.0777 kg |
Limitations and assumptions
Uses the international avoirdupois pound; displayed output is rounded to eight decimal places.
Frequently asked questions
What is 150 pounds in kilograms?
150 pounds is 68.0389 kg.
How many kilograms are in one pound?
One pound equals 0.45359237 kg. The formula is kg = lb × 0.45359237.
How do I convert pounds to kilograms?
Use kg = lb × 0.45359237. For example, 10 pounds gives 4.5359237 kg. Enter your own value above and the converter does the arithmetic for you.
How do I convert kilograms back to pounds?
Use the Kilograms to Pounds converter, or invert the factor by dividing instead of multiplying.
Is this conversion exact?
The avoirdupois pound is defined as exactly 0.45359237 kg and the ounce as 1/16 of a pound, so mass conversions are exact apart from display rounding.