How pounds to kilograms are calculated
A pound is a fixed weight in kilograms, so the conversion is one multiplication or its reverse.
kg = lb × 0.45359237
- One pound is exactly 0.45359237 kilograms, the figure agreed in 1959.
- Multiply pounds by 0.45359237 for kilograms, or divide kilograms by it to go back.
- One kilogram is about 2.2046 pounds, so 10 lb is roughly 4.5 kg.
- A stone is 14 pounds, still used for body weight — the result shows the total in stone and pounds.
Worked example — 10 lb × 0.45359237 = 4.54 kg, or 4,536 grams. That is 0 st 10 lb — just under half a stone.
Common amounts converted
| Pounds | Kilograms | Grams | Stone and pounds |
|---|---|---|---|
| 0.5 lb | 0.23 kg | 227 g | 0 st 0.5 lb |
| 1 lb | 0.45 kg | 454 g | 0 st 1 lb |
| 2 lb | 0.91 kg | 907 g | 0 st 2 lb |
| 5 lb | 2.27 kg | 2,268 g | 0 st 5 lb |
| 10 lb | 4.54 kg | 4,536 g | 0 st 10 lb |
| 25 lb | 11.34 kg | 11,340 g | 1 st 11 lb |
| 50 lb | 22.68 kg | 22,680 g | 3 st 8 lb |
| 100 lb | 45.36 kg | 45,359 g | 7 st 2 lb |
| 200 lb | 90.72 kg | 90,718 g | 14 st 4 lb |
Swipe the table sideways to see the rest.
To go the other way, switch the converter above to kg → Pounds.
Things to consider
- Luggage limits, body weight and postage are the common uses — check which unit your scale is set to.
- Postal and baggage limits are usually in kg, so round up, not down, when you check a bag.
- 1 stone = 14 lb = 6.35 kg, so 10 stone is 63.5 kg.
- A weight ounce is 28.35 g. This page converts weight, not fluid ounces.
Frequently asked questions
How many kilograms is a pound?
Exactly 0.45359237 kg. Ten pounds is 4.54 kg.
How many pounds is a kilogram?
About 2.2046 lb, so 5 kg is 11.02 lb.
What is 10 stone in kilograms?
10 stone is 140 lb, which is 63.5 kg.
Is a pound on a scale the same as a troy pound?
No. Everyday scales use the avoirdupois pound of 453.59 g. Precious metals use the lighter troy pound.
How do I convert kg back to pounds?
Divide the kilograms by 0.45359237, or switch this converter to kg → Pounds.
Results are estimates for general information only, not financial, medical or professional advice.