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Pound to Kilogram Converter

Instant, two-way conversion across common engineering units.

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1 lb = 0.45359237 kg(Pound → Kilogram)

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Converting pounds to kilograms

To convert pounds to kilograms, multiply the value by 0.45359237. Mass conversions support load take-offs, steel tonnage and transport limits, where imperial and metric figures often appear in the same package.

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To scale
1 pound = 0.45359237 kilograms.
1 kilogram = 2.2046226 pounds.

Pound (lb)

The pound (lb) is the base mass unit of US customary practice.

Origin
Defined internationally since 1959 as exactly 0.45359237 kg.
Where it is used
Used for loads, material weights and equipment ratings on US projects.
Relation to SI
1 lb = 0.45359237 kg exactly, so 1 kg is about 2.2046 lb.

Kilogram (kg)

The kilogram (kg) is the SI base unit of mass.

Origin
Once defined by a platinum-iridium prototype, it has been defined since 2019 by fixing the Planck constant.
Where it is used
Used for material densities, structural loads, equipment weights and specifications worldwide.
Relation to SI
The kilogram is the SI base unit; all other mass units here derive from it.

Frequently asked questions

How many kilograms are in one pound?

1 lb equals 0.45359237 kg.

How do I convert pounds to kilograms?

Multiply the value by 0.45359237. For example, 10 lb equals 4.5359237 kg.

How do I convert back from kilograms to pounds?

1 kg equals 2.2046226 lb. The converter above works in both directions, so you can type into either field.

Is this converting mass or weight?

Mass. Kilograms and pounds measure mass; force units such as newtons or kilonewtons are a separate quantity used in structural load calculations.

What is the difference between a US ton and a metric tonne?

A US short ton is 2,000 lb, about 907 kg, while a metric tonne is exactly 1,000 kg. The imperial long ton is 2,240 lb, about 1,016 kg.

Is this mass converter free to use?

Yes. Every unit conversion runs in your browser, needs no account and is free for professional use.

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