# How many pounds are in a kilogram?

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3093 Are you trying to convert pounds to kilograms for cooking or know your own weight? How many pounds are in a kilogram?

Kilogram, designation kg, is the unit of mass in SI. It is defined by adopting the set numerical value of Planck’s constant h, which is 6.62607015⋅10−34, expressed in the unit J · s, which is equal to kg⋅m2⋅s − 1, where meter and second are defined by ci ∆ νCs. The pound, on the other hand, is an off-system unit of mass derived from the Roman libra. The pound measure has varied over the centuries across countries, usually between 0.4 and 0.5 kilograms. Currently, in the Anglo-Saxon countries, an international pound of 0.453 592 37 kg is adopted and the abbreviation lb is used.

To convert pounds to kilograms you can use the practical rule:

• To get kilograms, divide by 2 and then take 1/10 of your answer
• Eg 100 pounds … Divide by two = 50 kg. Take off 1/10 = (50 – 5) = 45 kg.

This is close to the real answer of 45,355923 kg and is much easier to do in your head!

However, if you need an accurate conversion of pounds to kilograms. Use these conversion rates.

1 pound (pound) is equal to 0.45359237 kilogram (kg)

1 pound = 0.45359237 kg

The mass m in kilograms (kg) is equal to the mass m in pounds (pounds) times 0.45359237:

m (kg) = m (pound) × 0.45359237

## Example

Convert 5 pounds to kilograms:

m (kg) = 5 pounds × 0.45359237 = 2.268 kg