Understanding Pounds to Kilograms Conversion
Converting between pounds (lb or lbs) and kilograms (kg)
is essential when working with weights from different measurement systems.
The pound is a unit of mass in the imperial system, primarily used in the United States, United Kingdom,
and other English-speaking countries. The kilogram is the base unit of mass in the International System (SI),
used in most countries worldwide.
What is a Pound?
The pound is an Anglo-Saxon unit of mass measurement. Its value is internationally standardized:
- 1 pound (lb) = 0.453 592 37 kilogram exactly
- 1 pound = 16 ounces (oz)
- 14 pounds = 1 stone (used in the UK)
This unit is commonly used to measure body weight in the United States,
food products, luggage at American airports, and in many sports contexts.
What is a Kilogram?
The kilogram is the base unit of mass in the International System of Units (SI).
Since 2019, it has been defined based on the Planck constant:
- 1 kilogram = 1000 grams
- 1 kilogram = 2.204 622 62 pounds
- 1 kilogram approximately equals the mass of one liter of water
Conversion Formulas
To convert between pounds and kilograms:
- From pounds to kilograms: multiply by 0.453 592 37
- From kilograms to pounds: divide by 0.453 592 37 (or multiply by 2.204 622 62)
Pounds to Kilograms Conversion Table
| Pounds (lb) |
Kilograms (kg) |
| 1 lb |
0.45 kg |
| 5 lb |
2.27 kg |
| 10 lb |
4.54 kg |
| 20 lb |
9.07 kg |
| 50 lb |
22.68 kg |
| 100 lb |
45.36 kg |
| 150 lb |
68.04 kg |
| 200 lb |
90.72 kg |
Kilograms to Pounds Conversion Table
| Kilograms (kg) |
Pounds (lb) |
| 1 kg |
2.20 lb |
| 5 kg |
11.02 lb |
| 10 kg |
22.05 lb |
| 25 kg |
55.12 lb |
| 50 kg |
110.23 lb |
| 75 kg |
165.35 lb |
| 100 kg |
220.46 lb |
Practical Conversion Examples
- Body weight: A person weighing 150 pounds weighs approximately 68 kg
- Airline luggage: A 50 lb limit corresponds to about 23 kg
- Dumbbells: 25 lb weights equal approximately 11.3 kg
- Newborn: An 8 lb baby at birth weighs about 3.6 kg
Common Uses for Pounds/Kilograms Conversion
This conversion is particularly useful in the following areas:
- Health and fitness: For tracking weight with American or European scales
- Travel: To comply with luggage limits at airports
- Sports: For weight classes (boxing, MMA, weightlifting)
- Cooking: To adapt American recipes to the metric system
- International trade: For shipping and freight