Pounds to Kilograms Converter (lb to kg)
Convert pounds to kilograms instantly. 1 lb = 0.4536 kg. Includes the formula, a full conversion table and a calculator that works offline.
The formula
To convert pounds to kilograms, multiply by 0.4536:
kg = lb × 0.4536Going the other way, divide instead — or multiply by 2.205, which is the same thing:
lb = kg × 2.205Pounds to Kilograms conversion table
| Pounds | Kilograms |
|---|---|
| 1 lb | 0.4536 kg |
| 2 lb | 0.9072 kg |
| 3 lb | 1.361 kg |
| 4 lb | 1.814 kg |
| 5 lb | 2.268 kg |
| 6 lb | 2.722 kg |
| 7 lb | 3.175 kg |
| 8 lb | 3.629 kg |
| 9 lb | 4.082 kg |
| 10 lb | 4.536 kg |
| 15 lb | 6.804 kg |
| 20 lb | 9.072 kg |
| 25 lb | 11.34 kg |
| 30 lb | 13.608 kg |
| 40 lb | 18.144 kg |
| 50 lb | 22.68 kg |
| 75 lb | 34.019 kg |
| 100 lb | 45.359 kg |
| 250 lb | 113.4 kg |
| 500 lb | 226.8 kg |
| 1000 lb | 453.59 kg |
Kilograms to Pounds
| Kilograms | Pounds |
|---|---|
| 1 kg | 2.205 lb |
| 2 kg | 4.409 lb |
| 3 kg | 6.614 lb |
| 4 kg | 8.818 lb |
| 5 kg | 11.023 lb |
| 6 kg | 13.228 lb |
| 7 kg | 15.432 lb |
| 8 kg | 17.637 lb |
| 9 kg | 19.842 lb |
| 10 kg | 22.046 lb |
What that actually looks like
A conversion factor is hard to judge on its own. These are quantities most people already have a feel for, converted for you:
- A bag of flour is 5 pounds — 2.268 kg
- A newborn averages 7.5 pounds — 3.402 kg
- A checked-bag limit is usually 50 pounds — 22.68 kg
- An average adult is around 155 pounds — 70.307 kg
Why both units are still in use
Weight is where the two systems collide most awkwardly. Recipes, gym equipment, baggage allowances and medical charts each pick a side, and they do not agree. Airlines are the common trap: an allowance quoted in kilograms at one end of a journey can be quoted in pounds at the other, and the numbers are close enough to look interchangeable while being more than twice apart.
Mistakes worth avoiding
Pounds and ounces have the same trap: 8 pounds 6 ounces is 8.375 pounds, not 8.6, because an ounce is a sixteenth of a pound. And a stone is 14 pounds, so 11 stone 3 is 157 pounds rather than 113.
The other habit worth breaking is rounding too early. Convert first, round once at the end, and you avoid the drift that turns a small approximation into a visible error by the third calculation.
Doing it in your head
When you only need a rough answer, multiply by 4 and divide by 9 — which lands within 2.0 percent of the true value. Ten pounds works out at roughly 4.444 kilograms that way, against 4.536 exactly. An estimate is enough for deciding whether something will fit or whether a figure sounds plausible. When the number has to be right — because you are buying, cooking or building to it — use the calculator and let it carry the decimals.
Common questions
How many kilograms are in one pound?
One pound equals 0.4536 kilograms. The calculator above handles any value, including decimals and very large numbers, and updates as you type.
Is this an exact conversion?
Yes — this is an exact defined ratio, not an approximation. The table rounds for readability; the calculator does not.
Does this work offline?
Yes. The conversion runs in your browser with no network request, so it works on a plane, in a basement, or on a phone with no signal once the page has loaded.