Convert pounds (lbs) to kilograms (kg) instantly. Our calculator uses the exact conversion factor: 1 pound = 0.45359237 kilograms.
To convert pounds (lbs) to kilograms (kg), multiply the weight in pounds by 0.45359237. This is the exact conversion factor established by international agreement.
Kilograms = Pounds × 0.45359237
| Pounds (lbs) | Kilograms (kg) |
|---|---|
| 1 lbs | 0.454 kg |
| 2 lbs | 0.907 kg |
| 5 lbs | 2.268 kg |
| 10 lbs | 4.536 kg |
| 20 lbs | 9.072 kg |
| 50 lbs | 22.68 kg |
| 100 lbs | 45.359 kg |
| 120 lbs | 54.431 kg |
| 150 lbs | 68.039 kg |
| 160 lbs | 72.575 kg |
| 170 lbs | 77.111 kg |
| 180 lbs | 81.647 kg |
| 200 lbs | 90.718 kg |
| 250 lbs | 113.398 kg |
| 300 lbs | 136.078 kg |
Here are some everyday items and their weights in both pounds and kilograms:
A standard football
1 lbs = 0.45 kg
A one-kilogram weight
2.2 lbs = 1 kg
Average newborn baby
8 lbs = 3.63 kg
Average bowling ball
15 lbs = 6.8 kg
Standard barbell plate
45 lbs = 20.41 kg
Average adult weight
150 lbs = 68.04 kg
Average adult male weight
175 lbs = 79.38 kg
Professional heavyweight boxer (minimum)
220 lbs = 99.79 kg
The pound (lb) is the standard weight unit in the US and some other countries. One pound equals exactly 0.45359237 kilograms. The abbreviation "lb" comes from the Latin word "libra," which was a unit of measurement in ancient Rome.
The kilogram (kg) is the international standard unit of mass in the metric system. Since 2019, it's defined using the Planck constant, making it a precise and universal measurement standard used for:
The pound has been used for centuries, with variations across different regions. The modern international pound was standardized in 1959 when it was defined as exactly 0.45359237 kilograms. The kilogram was originally defined as the mass of one liter of water at freezing point, but now has a more precise scientific definition based on fundamental physical constants.
Use this conversion table for quick reference when converting common pound values to kilograms:
| Pounds (lbs) | Kilograms (kg) |
|---|---|
| 5 lbs | 2.268 kg |
| 10 lbs | 4.536 kg |
| 15 lbs | 6.804 kg |
| 20 lbs | 9.072 kg |
| 25 lbs | 11.34 kg |
| 30 lbs | 13.608 kg |
| 35 lbs | 15.876 kg |
| 40 lbs | 18.144 kg |
| 45 lbs | 20.412 kg |
| 50 lbs | 22.68 kg |
| 55 lbs | 24.948 kg |
| 60 lbs | 27.216 kg |
| 65 lbs | 29.483 kg |
| 70 lbs | 31.751 kg |
| 75 lbs | 34.019 kg |
| 80 lbs | 36.287 kg |
| 85 lbs | 38.555 kg |
| 90 lbs | 40.823 kg |
| 95 lbs | 43.091 kg |
| 100 lbs | 45.359 kg |
Note: All conversions use the exact factor of 0.45359237 kg per pound for maximum accuracy.
Medical professionals often need to convert between pounds and kilograms for:
Weight conversion is essential in fitness contexts for:
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Converting between pounds and kilograms is common when:
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