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ItalianoPounds to kilograms: the formula and an example
To convert pounds to kilograms, multiply by 0.45359237: kg = lb × 0.45359237. Example: 150 lb × 0.45359237 = 68.04 kg. The factor is exact, because it is the legal definition of the pound.
The converter on this page is already set to lbs to kg. The answer follows your typing, the formula is shown below it and a table gives the same weight in grams, ounces and stones. The swap button turns it into kg to lbs. Results are rounded to six significant figures.
lbs to kg conversion chart
| Pounds (lb) | kg | For reference |
|---|---|---|
| 1 | 0.45 | A pound of butter |
| 5 | 2.27 | Light dumbbell |
| 10 | 4.54 | Weight plate |
| 25 | 11.34 | Weight plate |
| 35 | 15.88 | Weight plate |
| 45 | 20.41 | Large plate |
| 50 | 22.68 | Checked bag limit |
| 70 | 31.75 | Heavy bag limit |
| 120 | 54.43 | Body weight |
| 140 | 63.50 | Body weight |
| 160 | 72.57 | Body weight |
| 180 | 81.65 | Body weight |
| 200 | 90.72 | Body weight |
| 220 | 99.79 | Body weight |
Gym plates, luggage, recipes, parcels
At the gym. A 45 lb bar with one 45 lb plate on each side is 135 lb, or 61.23 kg. In a gym with metric equipment, the closest setup is a 20 kg bar with two 20 kg plates, 60 kg in all.
Luggage. Your usual 50 lb checked bag is 22.68 kg, just under the 23 kg many international airlines print on the ticket. A 70 lb allowance is 31.75 kg.
Recipes. If you send a recipe to someone who weighs ingredients in grams, 1 lb of butter is 453.6 g and 8 oz is half of that, 226.8 g. One ounce is 28.35 g.
Parcels. International shipping forms ask for kilograms: a 2 lb package is 907 g and a 10 lb box is 4.54 kg.
Mental math: halve it, then take off 10%
For 150 lb: half is 75, minus 7.5 gives 67.5 kg. The exact figure is 68.04 kg, so the shortcut is 0.54 kg low, an error of 0.8%. For 200 lb it says 90 kg instead of 90.72 kg.
Frequently asked questions
How many grams are in a pound?
Exactly 453.59237 g. Do not expect that figure at a market in France or Germany, where "a pound" of fruit is a rounded 500 g. Over 10 lb, the gap already reaches 464 g.
How do I convert pounds and ounces to kilograms?
Divide the ounces by 16 and add them to the pounds. A baby weighing 7 lb 11 oz is 7 + 11 ÷ 16 = 7.6875 lb, which is 3.487 kg.
What about a weight in stones?
Multiply the stones by 14, add the pounds, then convert. 11 st 6 lb is 11 × 14 + 6 = 160 lb, or 72.57 kg. You can also pick the stone as the starting unit in the converter: 1 stone = 6.35029318 kg.