Pounds to Kilograms
Type pounds (lb), see kilograms (kg).
By Akash Yadav Updated 22 October 2026
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The formula
How to convert pounds to kilograms
To change pounds into kilograms, multiply by 0.45359237.
kilograms = pounds × 0.45359237
Going the other way: pounds = kilograms × 2.204622621849
1 pound = 0.45359237 kilograms. This factor is the exact definition of the unit, not a rounded estimate.
Worked example
You have 150 pounds. Multiply by 0.45359237. 150 × 0.45359237 = 68.0389 kg.
Common values
Pounds to kilograms conversion table
| Pounds (lb) | Kilograms (kg) |
|---|---|
| 1 lb | 0.4536 kg |
| 5 lb | 2.268 kg |
| 10 lb | 4.5359 kg |
| 20 lb | 9.0718 kg |
| 50 lb | 22.6796 kg |
| 80 lb | 36.2874 kg |
| 100 lb | 45.3592 kg |
| 120 lb | 54.4311 kg |
| 140 lb | 63.5029 kg |
| 150 lb | 68.0389 kg |
| 160 lb | 72.5748 kg |
| 180 lb | 81.6466 kg |
| 200 lb | 90.7185 kg |
| 250 lb | 113.3981 kg |
Before you rely on it
One exact number, no rounding needed
1 pound is defined as exactly 0.45359237 kilograms, agreed internationally in 1959. It is not an estimate.
The quick "halve it and take off a bit" trick gets you close, but the number above is the exact one.
For a weight in pounds and ounces — a newborn at 7 lb 8 oz, say — turn the ounces into a fraction of a pound first. There are 16 ounces to the pound, so 8 oz is 0.5 lb, and 7.5 lb is about 3.4 kg.
Gym plates are marked in one unit or the other and are not interchangeable: a 45 lb plate is about 20.4 kg, close to a 20 kg plate but not the same weight. Load a bar in one unit throughout.
Common questions
Frequently asked questions
How many kilograms is 1 pound?
1 pound is exactly 0.45359237 kg.
Why is the pound-to-kilogram conversion factor so exact?
Because the pound was formally redefined in 1959 as exactly 0.45359237 kilograms by international agreement — it is not a rounded estimate.
How do I convert my body weight from lbs to kg?
Use the same formula as above. For example, 165 lb is about 74.84 kg.
How many kilos is 5 lb?
5 lb is about 2.27 kg. "Kilo" is everyday shorthand for kilogram.
How many kg is 200 lb?
200 lb is about 90.72 kg.
What is 7 lb 8 oz in kg?
7 lb 8 oz is 120 oz, or 7.5 lb, which is about 3.4 kg.
Keep going
Related converters
- Kilograms to Pounds kg → lb
- Pounds to Stone lb → st
- Pounds to Ounces lb → oz
- Grams to Pounds g → lb
- All weight converters
Every factor on this page is listed in our conversion methodology.