lbs to kg Conversion (Pounds to Kilograms)

Enter the weight in pounds below to get the value converted to kilograms.

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1 lb = 0.453592 kg
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How to Convert Pounds to Kilograms

To convert a pound measurement to a kilogram measurement, multiply the weight by the conversion ratio.

Since one pound is equal to 0.45359237 kilograms, you can use this formula to convert lbs to kg:

kilograms = pounds × 0.45359237

The weight in kilograms is equal to the pounds multiplied by 0.45359237.

For example, here's how to convert 3 pounds to kilograms using the formula above.
5 lbs = (5 × 0.45359237) = 2.267962 kg

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Pounds and kilograms are both units used to measure weight. Keep reading to learn more about each unit of measure.

Pounds

Pounds are a widely used unit of mass/weight in the United States. The National Bureau of Standards approved the international definition of the pound for use in the United States in 1959 after an agreement between six nations referred to as the International Yard and Pound Agreement.[1]

One pound is equal to 16 ounces, or 0.45359237 kilograms. In the avoirdupois or apothecaries' systems, one pound is equal to 7,000 grains.[2]

The pound is a US customary and imperial unit of weight. A pound is sometimes also referred to as a common ounce. Pounds can be abbreviated as lb, and are also sometimes abbreviated as lbs, lbm, or #. For example, 1 pound can be written as 1 lb, 1 lbs, 1 lbm, or 1 #.

Kilograms

The definition of the kilogram changed in 2019. One kilogram was previously equal to the mass of the platinum-iridium bar, known as the International Prototype of the Kilogram, which was stored in Sèvres, France.

The 2019 SI brochure now defines the kilogram using the Planck constant, and it is defined using the meter and second.[3] It is roughly equal to the mass of 1,000 cubic centimeters of water.

The kilogram, or kilogramme, is the SI base unit for weight and is also a multiple of the gram. In the metric system, "kilo" is the prefix for 103. Kilograms can be abbreviated as kg; for example, 1 kilogram can be written as 1 kg.

Pound to Kilogram Conversion Table

Pound measurements converted to kilograms
Pounds Kilograms
1 lb 0.453592 kg
2 lb 0.907185 kg
3 lb 1.3608 kg
4 lb 1.8144 kg
5 lb 2.268 kg
6 lb 2.7216 kg
7 lb 3.1751 kg
8 lb 3.6287 kg
9 lb 4.0823 kg
10 lb 4.5359 kg
11 lb 4.9895 kg
12 lb 5.4431 kg
13 lb 5.8967 kg
14 lb 6.3503 kg
15 lb 6.8039 kg
16 lb 7.2575 kg
17 lb 7.7111 kg
18 lb 8.1647 kg
19 lb 8.6183 kg
20 lb 9.0718 kg
21 lb 9.5254 kg
22 lb 9.979 kg
23 lb 10.43 kg
24 lb 10.89 kg
25 lb 11.34 kg
26 lb 11.79 kg
27 lb 12.25 kg
28 lb 12.7 kg
29 lb 13.15 kg
30 lb 13.61 kg
31 lb 14.06 kg
32 lb 14.51 kg
33 lb 14.97 kg
34 lb 15.42 kg
35 lb 15.88 kg
36 lb 16.33 kg
37 lb 16.78 kg
38 lb 17.24 kg
39 lb 17.69 kg
40 lb 18.14 kg

References

  1. National Bureau of Standards, Refinement of Values for the Yard and Pound, U.S. Department of Commerce, July 1, 1959, https://www.nist.gov/system/files/documents/2017/05/09/frn-59-5442-1959.pdf
  2. Encyclopædia Britannica, Avoirdupois weight, https://www.britannica.com/science/avoirdupois-weight
  3. International Bureau of Weights and Measures, The International System of Units, 9th Edition, 2019, https://www.bipm.org/documents/20126/41483022/SI-Brochure-9-EN.pdf

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