Pounds to Kilograms Converter
Enter the weight in pounds below to convert it to kilograms.
Convert Pounds to Kilograms
Enter a value in pounds (lb) to convert to kilograms (kg).
Pound to Kilogram Conversion Table
Table showing various pound measurements converted to kilograms. Click any preset value or arrow to load it into the converter.
| Pounds (lb) | Kilograms (kg) |
|---|---|
| 1 lb | 0.4535924 kg |
| 2 lb | 0.9071847 kg |
| 5 lb | 2.2679619 kg |
| 10 lb | 4.5359237 kg |
| 15 lb | 6.8038856 kg |
| 20 lb | 9.0718474 kg |
| 25 lb | 11.3398093 kg |
| 30 lb | 13.6077711 kg |
| 50 lb | 22.6796185 kg |
| 75 lb | 34.0194277 kg |
How to Convert Pounds to Kilograms
To convert pounds to kilograms, multiply the weight by the following conversion ratio: 0.4535924 kilograms/pound.
Since one pound is equal to 0.4535924 kilograms, you can use this simple formula to convert:
The weight in kilograms is equal to the weight in pounds multiplied by 0.4535924.
For example, here's how to convert 150 pounds to kilograms using the formula above.
How Many Kilograms Are in a Pound?
There are 0.4535924 kilograms in a pound, which is why we use this value in the formula above.
Our pound to kilogram calculator automatically converts your weight measurements with full decimal and scientific precision across US customary, imperial, and SI metric standards.
Pounds and kilograms are both units used to measure weight. Keep reading to learn more about each unit.
What Is a Pound?
A pound is a unit of weight equal to 0.4535924 kilograms (kg), the base unit for weight. Imperial and US Customary unit defined legally as exactly 0.45359237 kg. [1]
The pound is classified as a US customary and imperial unit of weight. Pounds can be abbreviated as lb; for example, 1 pound can be written as 1 lb.
When working with pounds (lb) in formulas or technical specifications, always verify whether your target system uses SI metric, US customary, or British imperial standards.
In practice, pounds (lb) are widely used across standard weight applications within US customary and imperial workflows, engineering documentation, and technical data sheets.
What Is a Kilogram?
The fundamental SI unit of mass. It serves as a primary reference unit for measuring weight across scientific and practical applications. [2]
The kilogram is classified as an International System of Units (SI) unit of weight. Kilograms can be abbreviated as kg; for example, 1 kilogram can be written as 1 kg.
Although the name "kilogram" begins with the SI prefix "kilo" (1,000 grams), the kilogram (kg) is the sole SI base unit whose definition includes a prefix for historical reasons established by the BIPM.
In practice, kilograms (kg) are widely used across standard weight applications within International System of Units (SI) workflows, engineering documentation, and technical data sheets.
When converting weight between pounds (lb) and kilograms (kg), keep full floating-point precision (1 lb = 0.4535924 kg; 1 kg = 2.2046226 lb) during intermediate calculations and round only the final kilogram figure to match your instrument tolerance.
More Pound & Kilogram Conversions
Need to calculate in the opposite direction? Use our kilograms to pounds converter (kg to lb) to switch your starting unit immediately. You can also explore related tools such as converting grams to kilograms, converting stones to kilograms, or converting pounds to stones.
Convert from Pounds
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Frequently Asked Questions
References
- [1]NIST OWM StandardNIST OWM (SI Units — Mass)·Mass & Weight Metrology Standard — Pounds (lb) to Kilograms (kg)
- [2]NIST HB 44 SpecificationNIST HB 44 (NIST Handbook 44 (Current Ed.))·Unit Specifications: Pound (Avoirdupois) (lb) & Kilogram (kg)
- [3]BIPM ReferenceBIPM (SI Base Unit: Kilogram (kg))·Conversion Factors & Mathematical Basis (lb to kg)