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Pound Converters

Convert pounds to kilograms, ounces, grams, stones, tonnes and other weight units, including troy pounds and ounces.

What this tool does

Convert pounds to kilograms, ounces, grams, stones, tonnes and other weight units, including troy pounds and ounces. Type an amount in pounds (avoirdupois), choose the units, and the tool converts it to kilograms. It offers 11 mass units and also shows the same amount in the others.

Inputs

  • Value: A number.
  • From: Choose one from 11 options, including Pound (avoirdupois), Kilogram, Gram, Milligram, Ounce (avoirdupois), Stone. Starts as Pound (avoirdupois).
  • To: Choose one of the same 11 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. Weight on a scale depends on local gravity, which the converter ignores.
  • Ounces here are avoirdupois ounces unless the label says troy.

FAQs

Q: How many kilograms are in a pound?
A: One pound is exactly 0.45359237 kg, which is about 0.4536 kg. One kilogram is about 2.2046 pounds.
Q: Which pound does this use?
A: The ordinary avoirdupois pound of 16 ounces, used for body weight, food and shipping. The troy pound (12 troy ounces, about 373.24 g) is listed separately for precious metals.
Q: What is the difference between a short ton, a long ton and a tonne?
A: A short ton is 2,000 pounds (US), a long ton is 2,240 pounds (UK) and a tonne is 1,000 kilograms (metric).

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