LB to KG Converter
Convert pounds to kilograms instantly. One pound is exactly 0.45359237 kilograms, the international definition agreed in 1959 and still in force today.
Enter any value below and the result updates as you type. The formula, a full chart and answers to common questions follow.
LB to KG converter
pounds (lb)= kilograms (kg)The formula
pounds × 0.45359237 = kilograms. To reverse it, multiply kilograms by 2.20462262 to get pounds.
Because the pound is defined from the kilogram rather than measured against it, this conversion is exact. Any rounding you see is only in how the answer is displayed, not in the factor itself.
A reliable mental shortcut is to halve the pounds and then take off about ten per cent. One hundred and sixty pounds halves to 80, less ten per cent gives 72, against a true value of 72.6 kilograms. If you are starting from stones, multiply the stones by 14 first to get pounds, then convert.
Pounds to kilograms chart
| Pounds | Kilograms | Stones and pounds |
|---|---|---|
| 1 lb | 0.45 kg | 0 st 1 lb |
| 10 lb | 4.54 kg | 0 st 10 lb |
| 14 lb | 6.35 kg | 1 st 0 lb |
| 50 lb | 22.68 kg | 3 st 8 lb |
| 100 lb | 45.36 kg | 7 st 2 lb |
| 140 lb | 63.50 kg | 10 st 0 lb |
| 160 lb | 72.57 kg | 11 st 6 lb |
| 180 lb | 81.65 kg | 12 st 12 lb |
| 200 lb | 90.72 kg | 14 st 4 lb |
Frequently asked questions
How many kilograms is 1 pound?
One pound is exactly 0.45359237 kilograms, usually rounded to 0.454 kg.
How do I convert 150 lb to kg?
Multiply 150 by 0.45359237, which gives 68.04 kilograms.
How many pounds are in a stone?
Fourteen. To convert stones straight to kilograms, multiply the stones by 6.35029318.
Why does my luggage allowance use kilograms?
Airlines and most international trade use metric mass, so allowances are set in kilograms even where passengers weigh their bags in pounds at home.
Is there a quick mental method?
Halve the pounds, then subtract about ten per cent of that half. It is accurate to within roughly one per cent.
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