Pounds to Kilograms Converter
There are exactly 0.45359237 kilograms in one pound. To convert pounds to kilograms, multiply by 0.45359237.
How to Convert Pounds to Kilograms
To convert pounds to kilograms, multiply by 0.45359237.
For example: 5 pounds × 0.45359237 = 2.26796185 kilograms.
Where This Comes Up
American scales, gym plates, luggage limits and shipping rates are all in pounds, while airline allowances, medical dosing and almost every form abroad want kilograms. This is the single most looked-up weight conversion in the United States.
A 180-pound person weighs 81.6466 kilograms, the figure a doctor outside the US would use to calculate a dose.
What People Get Wrong
Airline baggage limits are set in kilograms and rounded down, not up. A 50-pound bag is 22.6796 kg, which is over a 22 kg allowance even though 50 lb sounds like the usual limit.
Pounds to Kilograms Conversion Table
| Pounds (lb) | Kilograms (kg) |
|---|---|
| 1 | 0.45359237 |
| 2 | 0.90718474 |
| 3 | 1.36077711 |
| 4 | 1.81436948 |
| 5 | 2.26796185 |
| 6 | 2.72155422 |
| 7 | 3.17514659 |
| 8 | 3.62873896 |
| 9 | 4.08233133 |
| 10 | 4.5359237 |
| 11 | 4.98951607 |
| 12 | 5.44310844 |
| 13 | 5.89670081 |
| 14 | 6.35029318 |
| 15 | 6.80388555 |
| 16 | 7.25747792 |
| 17 | 7.71107029 |
| 18 | 8.16466266 |
| 19 | 8.61825503 |
| 20 | 9.0718474 |
| 25 | 11.3398 |
| 30 | 13.6077711 |
| 40 | 18.1436948 |
| 50 | 22.6796185 |
| 75 | 34.0194 |
| 100 | 45.359237 |
| 250 | 113.398 |
| 500 | 226.796185 |
| 1,000 | 453.59237 |
About These Units
The pound
The pound is exactly 0.45359237 kilograms and contains 16 ounces. It is the standard American unit for body weight, groceries and shipping.
The kilogram
The kilogram is the SI base unit of mass, redefined in 2019 in terms of the Planck constant. The pound is now legally defined as exactly 0.45359237 kilograms.
Definitions follow NIST Special Publication 811, Appendix B. See how we calculate for the exact values and rounding rules.
Frequently Asked Questions
Is a pound exactly 0.45359237 kilograms?
Yes. The international avoirdupois pound has been defined as exactly 0.45359237 kilograms since 1959, so the conversion is exact rather than measured.
How many kilograms is 150 pounds?
150 pounds is 68.0389 kilograms.
Is dividing by 2.2 accurate enough?
It is within 0.2 percent, which is fine for body weight. For a 50-pound bag it is off by about 48 grams.
Does this work for pounds-force?
No. The pound here is a unit of mass. Pound-force is a unit of force and converts to newtons, not kilograms.