Convert Pounds to Kilograms
1 lb = 0.453592 kg
Conversion Table
| pounds (lb) | kilograms (kg) |
|---|---|
| 0.5 | 0.226796 |
| 1 | 0.453592 |
| 2 | 0.907184 |
| 5 | 2.268 |
| 10 | 4.5359 |
| 25 | 11.3398 |
| 50 | 22.6796 |
| 100 | 45.3592 |
| 250 | 113.4 |
| 500 | 226.8 |
| 1000 | 453.59 |
How to Convert pounds to kilograms
To convert pounds to kilograms, multiply the value by the conversion factor:
For example: 10 lb = 4.5359 kg
Related Converters
About pounds and kilograms
The Conversion Formula
To convert pounds to kilograms, multiply the value by the conversion factor: 1 lb = 0.453592 kg. For a worked example, suppose you need to convert 25 lb to kilograms: 25 × 0.453592 = 11.3398 kg. To convert in the opposite direction, divide by 0.453592, or equivalently multiply by 2.2046.
About pounds
The pound (lb) traces its roots to the Roman 'libra', which is why its abbreviation is 'lb'. The modern 'avoirdupois pound' was standardized in 1959 to be exactly 0.45359237 kilograms, creating a bridge between the imperial and metric worlds. While the UK has officially adopted metric, the pound remains the cultural standard for body weight there (often via 'stones') and is the official unit of weight in the United States. pounds are commonly used in Body weight (US), Grocery produce (US), Baby birth weight, and Dumbbells and kettlebells (US), Boxing weight classes.
A loaf of sandwich bread weighs about 1 pound.
About kilograms
The kilogram (kg) is the base unit of mass in the International System of Units (SI). Established in 1795 as the mass of one liter of water at the freezing point, it has been the world's standard for over two centuries. Until 2019, it was defined by a physical platinum-iridium cylinder locked in a vault in Paris (Le Grand K). Today, it is defined by the Planck constant, a fundamental constant of quantum physics, ensuring it remains stable and precise forever. kilograms are commonly used in Body weight (worldwide except US), Gym equipment (plates/dumbbells), International shipping, and Scientific mass measurements, Food packaging (globally).
A liter of bottled water weighs exactly 1 kilogram.
When Would You Convert pounds to kilograms?
Converting between pounds and kilograms is one of the most common weight conversions. You might need this conversion when working with international specifications, following instructions written for a different measurement system, or comparing values across different standards. Having the conversion factor (1 lb = 0.453592 kg) memorized or bookmarked can save time in professional and everyday contexts alike.