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Pounds to Kilograms

Convert pounds (lbs) to kilograms (kg) with a precise result, and see other mass units alongside.

What this tool does

Convert pounds (lbs) to kilograms (kg) with a precise result, and see other mass units alongside. Type an amount in pounds (avoirdupois), choose the units, and the tool converts it to kilograms. It offers 5 mass units and also shows the same amount in the others.

Inputs

  • Value: A number.
  • From: Choose one: Pound (avoirdupois), Kilogram, Gram, Ounce (avoirdupois), Stone. Starts as Pound (avoirdupois).
  • To: Choose one of the same 5 units as "From". Starts as Kilogram.

How to use

  1. Enter the amount you want to convert.
  2. Choose the unit to convert from and the unit to convert to.
  3. Read the result: the converted amount and the same amount in the other units. It appears once every required field has a valid value.

Worked examples

Conversions from pounds (avoirdupois) to kilograms:

  • 1 lb = 0.45359237 kg
  • 5 lb = 2.26796185 kg
  • 10 lb = 4.5359237 kg
  • 50 lb = 22.6796185 kg
  • 100 lb = 45.359237 kg

Multiply the number of pounds (avoirdupois) by 0.45359237 to get kilograms. Both units are exact definitions, so 0.45359237 is the exact factor: 1 lb = 0.45359237 kg.

Sources: Pound (avoirdupois): International yard and pound agreement, 1959. Kilogram: SI Brochure, 9th edition (2019, updated 2022), Table 7 (SI prefixes).

Limitations

  • Converts mass units only. It does not convert between mass and volume or energy, which needs a density or other second value.

FAQs

Q: How many kilograms is one pound?
A: One pound is exactly 0.45359237 kilograms, about 0.4536 kg.
Q: How many pounds is a kilogram?
A: One kilogram is about 2.2046 pounds.

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