Pounds to kilograms (lb to kg)
The answer, the exact formula and a table with the values people look up most.
1 lb = 0.453592 kg1 kg = 2.20462 lbKilograms = Pounds × 0.45359237Example: 120 lb = 54.4311 kg
1 lb = 0.45359237 kg
Conversions people ask for most
Convert pounds to kilograms
| lb | kg |
|---|---|
| 1 lb | 0.45359 kg |
| 2 lb | 0.90718 kg |
| 5 lb | 2.268 kg |
| 10 lb | 4.5359 kg |
| 20 lb | 9.0718 kg |
| 25 lb | 11.34 kg |
| 50 lb | 22.68 kg |
| 100 lb | 45.359 kg |
| 110 lb | 49.895 kg |
| 120 lb | 54.431 kg |
| 130 lb | 58.967 kg |
| 140 lb | 63.503 kg |
| 150 lb | 68.039 kg |
| 160 lb | 72.575 kg |
| 170 lb | 77.111 kg |
| 180 lb | 81.647 kg |
| 200 lb | 90.718 kg |
| 220 lb | 99.79 kg |
| 250 lb | 113.4 kg |
The factor is exact: it comes from the official definition of the units. The table rounds to a few decimals; the converter above gives up to 10 significant digits.
The two units
Pound lb
A pound (avoirdupois) is exactly 0.45359237 kilograms; it is the everyday unit of weight in the United States.
Kilogram kg
The kilogram is the SI base unit of mass; since 2019 it is defined from the Planck constant instead of a metal cylinder.
Frequently asked questions
How many kilograms are 120 pounds?
120 lb = 54.4311 kg.
What is the formula to convert pounds to kilograms?
Kilograms = Pounds × 0.45359237. 120 lb = 54.4311 kg.
Is this conversion exact?
Yes. The factor comes from the international definition of both units, so the only difference you may see is rounding.