This converter turns pounds into kilograms instantly, using the exact factor 1 pound = 0.45359237 kilograms. Type any number and the result updates as you go — nothing is sent to a server, so the arithmetic happens entirely in your browser.
Exactly 0.45359237 kilograms, the primary US unit of body and produce weight. The SI base unit of mass, redefined in 2019 in terms of the Planck constant.
Because the relationship is a simple proportion, one multiplication does the whole job. The table further down gives pre-computed values for the amounts people look up most often, and the result panel also reports the reverse conversion so you can check the figure both ways.
The formula
pounds- The amount you are converting, measured in pounds
0.45359237- The exact number of kilograms in one pound
kilograms- The converted result
How it works, step by step
- Enter the number of pounds you want to convert.
- The value is multiplied by 0.45359237, the exact conversion factor.
- The result is displayed in kilograms, rounded for readability.
- The unrounded value and the reverse conversion appear underneath so you can verify it.
Worked examples
Converting 5 pounds
Multiply 5 by 0.45359237. That gives 2.268 kilograms. A quick sanity check: one pound is smaller than one kilogram, so the number should get smaller — and it does.
Converting 72 pounds
72 × 0.45359237 = 32.6587 kilograms. Working backwards, 32.6587 ÷ 0.45359237 returns 72 pounds, which confirms the factor is applied the right way round.
How to read your score
Frequently asked questions
How many kilograms are in one pound?
Exactly 0.45359237. Every conversion on this page is that single number multiplied by your input, so the result carries no rounding error beyond what is shown.
What is the formula to convert pounds to kilograms?
Kilograms = pounds × 0.45359237. To reverse it, divide instead: pounds = kilograms ÷ 0.45359237, which is the same as multiplying by 2.204622622.
Is the pound bigger than the kilogram?
No. One pound is only 0.453592 of a kilogram, so the kilogram is the larger unit.
Why does my answer differ slightly from other pounds to kg converters?
Most differences come from rounding the factor too early. This tool keeps full double precision through the calculation and only rounds at the final display step, and it also shows the unrounded value so you can see exactly where any difference appears.
What is a pound?
Exactly 0.45359237 kilograms, the primary US unit of body and produce weight.
What is a kilogram?
The SI base unit of mass, redefined in 2019 in terms of the Planck constant.
Pounds to kilograms reference table
| Pounds | Kilograms |
|---|---|
| 0.5 lb | 0.226796 kg |
| 1 lb | 0.453592 kg |
| 2 lb | 0.907185 kg |
| 3 lb | 1.3608 kg |
| 5 lb | 2.268 kg |
| 10 lb | 4.5359 kg |
| 15 lb | 6.8039 kg |
| 20 lb | 9.0718 kg |
| 25 lb | 11.3398 kg |
| 50 lb | 22.6796 kg |
| 75 lb | 34.0194 kg |
| 100 lb | 45.3592 kg |
| 250 lb | 113.3981 kg |
| 500 lb | 226.7962 kg |
| 1000 lb | 453.5924 kg |
Exact factor: 1 pound = 0.45359237 kilograms. Values rounded for display.