Pounds to kilograms (lb to kg)
Convert pounds to kilograms. For mass, 1 lb equals 0.45359237 kg.
Converter
lb to kg conversion table
| Pounds | Kilograms |
|---|---|
| 1 lb | 0.45359237 kg |
| 2 lb | 0.90718474 kg |
| 5 lb | 2.2679619 kg |
| 10 lb | 4.5359237 kg |
| 25 lb | 11.339809 kg |
| 50 lb | 22.679619 kg |
| 100 lb | 45.359237 kg |
| 1000 lb | 453.59237 kg |
Formula
kg = lb × 0.45359237
Worked example
25 lb × 0.45359237 = 11.33980925 kg
Popular conversion examples
Choose an example to open this converter with the value filled in. These are useful examples, not a claim about search rankings.
- 1 lb to kg = 0.453592 kg
- 5 lb to kg = 2.26796 kg
- 100 lb to kg = 45.3592 kg
- 130 lb to kg = 58.967 kg
- 50 kg to lb = 110.231 lb
- 80 kg to lb = 176.37 lb
About pounds and kilograms
Pound (lb)
The avoirdupois pound is defined as exactly 0.45359237 kilograms. It is used for body weight, groceries and shipping in the US and UK.
Kilogram (kg)
The kilogram is the SI base unit of mass. It is used for body weight, groceries and shipping in most countries.
Both are units of mass; the base unit used internally is kg.
Notes
- Ounces and pounds are avoirdupois units of mass (1 lb = 0.45359237 kg exactly).
- The stone is the British unit of 14 avoirdupois pounds (6.35029318 kg). The troy ounce (31.1034768 g, used for precious metals) is a different unit from the avoirdupois ounce, and the grain is exactly 1/7000 of a pound (64.79891 mg).
- Mass cannot be negative.
lb to kg FAQs
How do I convert pounds to kilograms?
Multiply the number of pounds by 0.45359237 to get kilograms. For example, 25 lb × 0.45359237 = 11.3398 kg.
How many kilograms are in one pound?
1 lb = 0.45359237 kg and 1 kg = 2.204622622 lb. To go the other way, use the kilograms to pounds converter.
How many kilograms are in 200 pounds?
200 lb = 90.7185 kg, rounded to 6 significant digits. Change the value in the converter above for any other amount.
How many kilograms are in 180 pounds?
180 lb = 81.6466 kg, rounded to 6 significant digits.
What is the formula for pounds to kilograms?
kg = lb × 0.45359237, where lb is the number of pounds and kg is the result in kilograms. The reverse is lb = kg × 2.204622622.
Is the lb to kg conversion exact?
Yes. The factor 0.45359237 follows directly from the unit definitions (The avoirdupois pound is defined as exactly 0.45359237 kilograms; the kilogram is the SI base unit of mass), so the only rounding is in the digits you choose to display.
What is the difference between pounds and kilograms?
The avoirdupois pound is defined as exactly 0.45359237 kilograms. It is used for body weight, groceries and shipping in the US and UK. The kilogram is the SI base unit of mass. It is used for body weight, groceries and shipping in most countries.
Does this convert weight or mass?
Strictly it converts mass. The pound, ounce and stone here are units of mass, which is what scales and everyday “weight” refer to on Earth. Pound-force and other units of force are different and are not handled by this converter.
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