The pound (lb) is a unit of mass commonly used in the United States and other countries.
Pounds to Kilograms
Convert pounds (lb) to kilograms (kg) instantly. Free online weight converter with formulas, tables and examples.
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The kilogram (kg) is the SI base unit of mass.
kg = lb × 0.45359237
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Formula
kg = lb × 0.45359237
lb = kg ÷ 0.45359237
Conversion table
| 1 lb | 0.453592 kg |
| 5 lb | 2.267962 kg |
| 10 lb | 4.535924 kg |
| 20 lb | 9.071847 kg |
| 50 lb | 22.679619 kg |
| 100 lb | 45.359237 kg |
| 500 lb | 226.796185 kg |
| 1000 lb | 453.592370 kg |
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Frequently asked questions
What is the source unit in this conversion?
The source unit is the pound (lb), the customary unit of mass used mainly in the United States and, informally, in the United Kingdom.
What is the destination unit in this conversion?
The destination unit is the kilogram (kg), the SI base unit of mass used worldwide in science, industry, and everyday measurement.
How do I convert pounds to kilograms?
Multiply the number of pounds by 0.45359237 to get the equivalent value in kilograms. For example, 5 lb × 0.45359237 = 2.267962 kg.
Is the pound to kilogram conversion exact?
Yes. The pound is legally defined as exactly 0.45359237 kilograms, so the factor 0.45359237 is an exact, non-rounded value.
Where is this conversion commonly used?
It's used in body-weight tracking, shipping and freight documentation, nutrition labeling, and any exchange between metric countries and countries that still use pounds, such as the United States.
Can I convert kilograms back to pounds?
Yes. Multiply the kilogram value by 2.2046226218487757, or divide it by 0.45359237, to convert back to pounds.
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About this conversion
This page converts pounds (lb), the customary unit of mass used in the United States and parts of the United Kingdom, into kilograms (kg), the SI base unit of mass.
Pound-to-kilogram conversions are common in body-weight tracking, gym equipment, luggage allowances, shipping labels, and recipes that mix imperial and metric measurements.
The formula is kg = lb × 0.45359237, derived from the internationally agreed definition of the pound as exactly 0.45359237 kilograms.
Because the pound is defined in terms of the kilogram by international agreement, the conversion is exact rather than approximate or measured.
The kilogram is the SI base unit of mass under the International System of Units, while the international avoirdupois pound is standardized by agreement among the US, UK, and other countries.