Convert pounds to kilograms
Pound (lb) to kilogram (kg). One pound equals 0.453592 kilograms.
Formula
Pound to kilogram conversion table
| Pounds | Kilograms | Kilograms | Pounds |
|---|---|---|---|
| 1 lb | 0.453592 kg | 1 kg | 2.2046 lb |
| 2 lb | 0.907185 kg | 2 kg | 4.4092 lb |
| 3 lb | 1.3608 kg | 3 kg | 6.6139 lb |
| 5 lb | 2.268 kg | 5 kg | 11.0231 lb |
| 10 lb | 4.5359 kg | 10 kg | 22.0462 lb |
| 20 lb | 9.0718 kg | 20 kg | 44.0925 lb |
| 50 lb | 22.6796 kg | 50 kg | 110.23 lb |
| 100 lb | 45.3592 kg | 100 kg | 220.46 lb |
| 500 lb | 226.8 kg | 500 kg | 1102.31 lb |
| 1000 lb | 453.59 kg | 1000 kg | 2204.62 lb |
Decimal pounds to kilograms conversion table
The exact decimal amounts people look up most often, worked out with the same factor the converter above uses. Every row is calculated, not rounded off a chart.
| Pounds | Kilograms |
|---|---|
| 0.5 lb | 0.226796 kg |
| 1 lb | 0.453592 kg |
| 2 lb | 0.907185 kg |
| 3 lb | 1.3608 kg |
| 4 lb | 1.8144 kg |
| 5 lb | 2.268 kg |
| 6 lb | 2.7216 kg |
| 7 lb | 3.1751 kg |
| 8 lb | 3.6287 kg |
| 9 lb | 4.0823 kg |
| 10 lb | 4.5359 kg |
| 11 lb | 4.9895 kg |
| 12 lb | 5.4431 kg |
| 13 lb | 5.8967 kg |
| 14 lb | 6.3503 kg |
| 15 lb | 6.8039 kg |
| 16 lb | 7.2575 kg |
| 17 lb | 7.7111 kg |
| 18 lb | 8.1647 kg |
| 19 lb | 8.6183 kg |
| 20 lb | 9.0718 kg |
| 30 lb | 13.6078 kg |
| 40 lb | 18.1437 kg |
| 50 lb | 22.6796 kg |
| 60 lb | 27.2155 kg |
| 70 lb | 31.7515 kg |
| 80 lb | 36.2874 kg |
| 90 lb | 40.8233 kg |
| 100 lb | 45.3592 kg |
| 110 lb | 49.8952 kg |
| 120 lb | 54.4311 kg |
| 130 lb | 58.967 kg |
| 140 lb | 63.5029 kg |
| 150 lb | 68.0389 kg |
| 160 lb | 72.5748 kg |
| 170 lb | 77.1107 kg |
| 180 lb | 81.6466 kg |
| 190 lb | 86.1826 kg |
| 200 lb | 90.7185 kg |
| 210 lb | 95.2544 kg |
| 220 lb | 99.7903 kg |
| 230 lb | 104.33 kg |
| 240 lb | 108.86 kg |
| 250 lb | 113.4 kg |
| 260 lb | 117.93 kg |
Kilograms back to pounds
The same conversion in reverse, for when you have the answer and need the question.
| Kilograms | Pounds |
|---|---|
| 1 kg | 2.2046 lb |
| 5 kg | 11.0231 lb |
| 10 kg | 22.0462 lb |
| 20 kg | 44.0925 lb |
| 45 kg | 99.208 lb |
| 50 kg | 110.23 lb |
| 68 kg | 149.91 lb |
| 90 kg | 198.42 lb |
Where the pound to kilogram factor comes from
- The avoirdupois pound is exactly 0.45359237 kilograms by the 1959 international agreement.
- That constant is the conversion directly, no reciprocal needed.
- kilograms = pounds × 0.45359237. Every digit is definitional, so the result is exact at any weight.
- 150 lb is 68.04 kg, 180 lb is 81.65 kg, and 200 lb is 90.72 kg.
Sources
Common mistakes
Halving is only a rough guess
A pound is a little under half a kilogram, so halving pounds overestimates: 150 lb halved is 75, but the real answer is 68.04 kg, about 9 percent lower. Multiply by 0.4536 for the correct figure.
US pounds and UK stone describe the same weight differently
A US weigh-in of 154 lb and a UK one of 11 stone are the same 70 kg. If you are converting from a UK source that says '11 st 6 lb', turn it fully into pounds first (11 × 14 + 6 = 160 lb) before converting to kilograms.
To convert pounds to kilograms, divide the number of pounds by 2.2046. One pound equals 0.453592 kilograms, and one kilogram equals 2.2046 pounds, so the relationship is fixed and exact. As a worked example, 10 lb comes to 4.5359 kg. Enter your own figure in the converter above to get an instant answer, or use the swap button to flip the direction. This is a mass conversion, and like every tool on UnitGlide it runs locally in your browser with no account or upload required. The table further down shows a range of common pound values already worked out in kilograms, plus the reverse kilogram to pound direction, which is handy for quick reference or double-checking a result by hand.
Frequently asked questions
How many kg is 150 lbs?
150 lb is 68.04 kg. Multiply pounds by 0.45359237: 150 × 0.45359237 = 68.04.
How many kg is 180 lbs?
180 lb is 81.65 kg. The factor is constant, so 100 lb is 45.36 kg and 200 lb is 90.72 kg.
Is a pound half a kilogram?
Not quite. A pound is 0.4536 kg, a bit under half. Two pounds is 0.907 kg, so it takes about 2.2 lb to make a full kilogram.
How many kilograms are in a pound?
One pound equals 0.453592 kilograms. The ratio is constant, so you can multiply any number of pounds by 0.453592 to get kilograms.
What is the formula to convert pounds to kilograms?
Use kilograms = pounds ÷ 2.2046. UnitGlide applies this exact formula for every value, so results stay accurate across the whole range.
How do I convert kilograms back to pounds?
Go the other way by using one kilogram equals 2.2046 pounds. You can also press the swap button in the converter above to flip the direction in one click.
Is this pound to kilogram converter accurate?
Yes. It uses internationally defined SI conversion factors, as maintained by the BIPM, and all math runs in your browser so nothing is rounded away on a server. For everyday use the displayed precision is more than enough.