Pounds to Kilograms Calculator
lb
Kilograms:
Grams:
Pounds and ounces:
Calculation:
This calculator converts pounds to kilograms using the exact factor. Type a weight in pounds and you get the result in kilograms, in grams, and in pounds and ounces.
Many charts round the factor to 0.45 or divide by 2.2, which is why their answers differ. This page uses the exact definition of the pound: 0.45359237 kg.
How to use the pounds to kilograms calculator?
Step 1: Type the weight in pounds. Decimals can be written with a point or a comma.
Step 2: Click Convert or press Enter.
Step 3: The weight in kilograms appears on the right. Below it you get the grams and the same weight in pounds and ounces.
Step 4: The Calculation box shows the multiplication with your numbers.
Pounds to kilograms formula
Since 1959, one international pound has been exactly 0.45359237 kilograms. To convert pounds to kilograms, multiply the pounds by that factor:
| m(kg) = m(lb) × 0.45359237 |
For a quick estimate without a calculator, divide the pounds by 2.2. With 150 lb that gives about 68.18 kg, against 68.04 kg exactly. The gap is small, but it grows with heavy weights.
Pounds to kilograms examples
Example 1: How many kilograms is 40 pounds?
m(kg) = 40 × 0.45359237 ≈ 18.14 kg
Example 2: How many kilograms is 50 pounds?
m(kg) = 50 × 0.45359237 ≈ 22.68 kg
US airlines commonly set the limit for a checked bag at 50 lb, while many airlines elsewhere use 23 kg. The two figures are not identical, but they are very close.
Example 3: Convert 150 pounds to kilograms
m(kg) = 150 × 0.45359237 ≈ 68.04 kg
A person who weighs 150 pounds weighs 68.04 kg.
Example 4: How many kilograms is a 45 lb barbell plate?
m(kg) = 45 × 0.45359237 ≈ 20.41 kg
A 45 lb plate weighs 20.41 kg, so it is a bit heavier than the 20 kg plates used in metric gyms.
Pounds to kilograms chart
| Pounds (lb) | Kilograms (kg) | Grams (g) |
|---|---|---|
| 1 lb | 0.4536 kg | 453.59 g |
| 2 lb | 0.9072 kg | 907.18 g |
| 5 lb | 2.268 kg | 2268 g |
| 10 lb | 4.536 kg | 4536 g |
| 15 lb | 6.804 kg | 6804 g |
| 20 lb | 9.072 kg | 9072 g |
| 25 lb | 11.34 kg | 11340 g |
| 30 lb | 13.61 kg | 13608 g |
| 40 lb | 18.14 kg | 18144 g |
| 45 lb | 20.41 kg | 20412 g |
| 50 lb | 22.68 kg | 22680 g |
| 60 lb | 27.22 kg | 27216 g |
| 70 lb | 31.75 kg | 31751 g |
| 80 lb | 36.29 kg | 36287 g |
| 90 lb | 40.82 kg | 40823 g |
| 100 lb | 45.36 kg | 45359 g |
| 120 lb | 54.43 kg | 54431 g |
| 150 lb | 68.04 kg | 68039 g |
| 200 lb | 90.72 kg | 90718 g |
| 250 lb | 113.4 kg | 113398 g |
Frequently asked questions
How many kilograms is one pound?
One pound is 0.4536 kg, or 453.59 g. The exact value is 0.45359237 kg.
How many pounds are in a kilogram?
A kilogram is 2.205 pounds. To convert in that direction, use the kilograms to pounds calculator.
How do I convert pounds to kilograms in my head?
Divide the pounds by 2.2 for a good estimate, or cut the pounds in half and subtract 10 percent of that. For example, 80 lb ÷ 2.2 ≈ 36.36 kg, and the exact value is 36.29 kg.
How many ounces and grams are in a pound?
A pound is 16 ounces or 453.59 g. A single ounce of weight is 28.35 g.
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