Convert Pounds to Kilograms
Use our free online converter to easily convert from Pounds to Kilograms. Get accurate conversions instantly.
Converting Pounds to Kilograms
Converting pounds to kilograms is essential for international travel, shipping, health and fitness tracking, and understanding product specifications across different measurement systems.
Mathematical Relationship
The mathematical relation between pounds and kilograms is: 1 pound = 0.453592 kilograms. To convert a mass in pounds to kilograms, multiply the pound value by 0.453592.
Common Conversion Values
| Pounds | Kilograms |
|---|---|
| 1 | 0.453592 |
| 5 | 2.26796 |
| 10 | 4.53592 |
| 50 | 22.6796 |
| 100 | 45.3592 |
Unit Definitions
Pounds
The pound (symbol: lb) is a unit of mass in the imperial and US customary systems of measurement. The international avoirdupois pound is defined as exactly 0.45359237 kilograms.
Kilograms
The kilogram (symbol: kg) is the base unit of mass in the International System of Units (SI). Since 2019, it has been defined in terms of the Planck constant, which relates a photon's energy to its frequency.
Historical Context
The pound has ancient origins, with variations used throughout history. The current international pound was standardized in 1959 based on the kilogram. The kilogram was originally defined in 1795 as the mass of one liter of water.