How Many Kilograms in a Pound?
0.4536 kg
1 pound equals 0.4536 kilogram; it takes 2.205 pounds to make 1 kilogram.
Exact: 1 lb = 0.45359237 kg
Pounds to Kilograms conversion chart
| Pounds | Kilograms |
|---|---|
| 0.25 lb | 0.1134 |
| 0.5 lb | 0.2268 |
| 0.75 lb | 0.3402 |
| 1 lb | 0.4536 |
| 1.5 lb | 0.6804 |
| 2 lb | 0.9072 |
| 3 lb | 1.361 |
| 4 lb | 1.814 |
| 5 lb | 2.268 |
| 10 lb | 4.536 |
| 15 lb | 6.804 |
| 20 lb | 9.072 |
| 25 lb | 11.34 |
| 30 lb | 13.61 |
| 40 lb | 18.14 |
| 50 lb | 22.68 |
| 53 lb | 24.04 |
| 60 lb | 27.22 |
| 75 lb | 34.02 |
| 100 lb | 45.36 |
| 120 lb | 54.43 |
| 130 lb | 58.97 |
| 150 lb | 68.04 |
| 160 lb | 72.57 |
| 180 lb | 81.65 |
| 200 lb | 90.72 |
| 220 lb | 99.79 |
| 250 lb | 113.4 |
How to convert pounds to kilograms
kilograms = pounds ÷ 2.20462
Example: 5 lb ÷ 2.20462 = 2.268 kg.
Multiply the pounds by 0.45359237, the exact size of one pound in kilograms. Dividing by 2.20462 gives the same result to four digits, but the multiplier is exact by definition, so nothing is lost to rounding. Either way, round only once, at the end.
150 lb is 68.04 kg, and a 40 lb bag of dog food is 18.14 kg. One decimal place in kilograms is enough for body weight. For a parcel, round up to the next tenth so the declared weight is never too low.
How to estimate pounds to kilograms in your head
Halve the pounds, then take away a tenth of that half. For 180 lb: half is 90, a tenth of 90 is 9, and 90 minus 9 leaves 81.
The exact answer is 81.65 kg. The shortcut multiplies by 0.45 instead of the true factor, so it always comes out a little under 1% low. That is close enough to check a scale reading or a gym plate, but not for a shipping label.
Converting pounds and ounces to kilograms
Turn the ounces into part of a pound first by dividing them by 16, then convert the total. A parcel of 7 lb 12 oz is 7.75 lb, which comes to 3.515 kg.
You can also go through ounces alone. The same parcel holds 7 × 16 + 12 = 124 oz, and 124 oz is also 3.515 kg, so both routes agree.
Pounds and kilograms: questions
Is a pound more or less than a kilogram?
Less. A pound is a little under half a kilogram, so a weight in kilograms is always a smaller number than the same weight in pounds. It takes 2.205 pounds to make one kilogram.
How many kilograms is 100 lb?
100 lb is 45.36 kg. Because the factor is exact, the result scales cleanly: 200 lb is 90.72 kg, and 50 lb is 22.68 kg. Doubling the pounds always doubles the kilograms, so you can build other amounts from these.
Why is a pound exactly 0.45359237 kg?
Because that is how the pound is defined. Since 1959, the avoirdupois pound used in the US and UK has been set in terms of the kilogram, and NIST Handbook 44 notes that the change made no appreciable difference to its actual size.
How do I convert stones and pounds to kilograms?
Turn the stones into pounds first; each stone is 14 pounds. 11 st 4 lb is 11 × 14 + 4 = 158 lb, which is 71.67 kg. The pounds to stones converter handles the reverse.
What is half a pound in kilograms?
0.5 lb is 0.2268 kg, or about 227 g. A quarter pound is half of that again: 0.1134 kg, or 113 g. Both are handy for recipes that list meat or cheese by the pound.
Related conversions
Sources: Unit definitions: NIST Handbook 44 · Last reviewed · Report an error
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