Convert lbs to kg
Convert lbs to kg instantly. 1 lb = 0.453592 kg. Formula, worked examples and a quick reference table.
Last updated
One pound equals 0.453592 kilograms. To convert any number of pounds to kilograms, multiply by 0.45359237.
The converter above works in both directions and updates as you type. Below you will find the formula, a worked example and a reference table of common values.
Weight and mass conversions matter most in three places: shipping, where a rate band can turn on a single kilogram; cooking, where recipes cross between metric grams and imperial ounces; and personal weight, where Britain and Ireland use stones, the United States uses pounds, and everywhere else uses kilograms. Strictly these are mass units rather than weight units, and the distinction only bites in physics, where weight is a force measured in newtons.
lbs to kg formula
To go the other way, use pound = kilogram ÷ 0.45359237.
About these units
The international avoirdupois pound is exactly 0.45359237 kilograms — defined in terms of the metric system, not the other way round.
Since 2019 the kilogram has been defined by the Planck constant rather than a metal cylinder in Paris, making it reproducible in any properly equipped laboratory.
Pound is also written pounds, lbs and #. Kilogram is also written kilogramme, kilogrammes, kilograms, kilos, kilo and kgs.
Sources
lbs to kg conversion table
| Pound | Kilogram |
|---|---|
| 1 lb | 0.4536 kg |
| 2 lb | 0.9072 kg |
| 3 lb | 1.3608 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 |
Frequently asked questions
How many kilograms are in a pound? +
There are 0.453592 kilograms in one pound.
What is 10 lb in kg? +
10 lb equals 4.5359 kg. Multiply 10 by 0.45359237.
How do I convert kilogram back to pound? +
Use pound = kilogram ÷ 0.45359237. The converter above handles both directions, or see our dedicated kg to lbs page.
How accurate is this pound to kilogram conversion? +
The factor used is 0.45359237, carried at full double precision. Where a unit has an exact legal definition the factor is exact rather than approximate. Rounding is applied only to the displayed result, so the answer is never a calculation done on an already-rounded number.
Is there a quick way to estimate lb to kg in my head? +
Divide by 2.2. That is 0.2101% off the exact factor of 0.453592, which is fine for a rough figure and not for anything that has to balance.