The kilogram is a unit used to measure weight. Use one of the conversion calculators below to convert to another unit of measure, or read on to learn more about kilograms.
Kilogram Conversion Calculators
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Kilogram Definition and Usage
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 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.
Background and Origin
Originally, the kilogram was defined in 1793 as the mass equal to one cubic decimeter of water and was adopted by France as the base unit of mass.
It was later adopted for use internationally, but in 1889 it was redefined as the mass equal to that of a platinum-iridium bar called the International Prototype Kilogram. For a period of time, the kilogram was the only unit in the international system of measures that is defined using a physical artifact.
In 2019 the kilgoram was redefined again using the Planck constant, meters, and seconds, removing the dependence on a physical artifact for the definition.
Kilograms Measurement Conversion Table
If you're here then there's a good chance you might be wondering just how much is a kilogram? The chart below shows how much a kilogram is in other measures of weight.
|kilograms||tons||pounds||ounces||metric tons||long tons||grams||milligrams||carats||calories||stones|
|1 kg||0.001102 t||2.204623 lb||35.273962 oz||0.001 t||0.000984 lt||1,000 g||1,000,000 mg||5,000 ct||7,716 kcal||0.157473 st|
|2 kg||0.002205 t||4.409245 lb||70.547924 oz||0.002 t||0.001968 lt||2,000 g||2,000,000 mg||10,000 ct||15,432 kcal||0.314946 st|
|3 kg||0.003307 t||6.613868 lb||105.821886 oz||0.003 t||0.002953 lt||3,000 g||3,000,000 mg||15,000 ct||23,149 kcal||0.472419 st|
|4 kg||0.004409 t||8.81849 lb||141.095848 oz||0.004 t||0.003937 lt||4,000 g||4,000,000 mg||20,000 ct||30,865 kcal||0.629892 st|
|5 kg||0.005512 t||11.023113 lb||176.36981 oz||0.005 t||0.004921 lt||5,000 g||5,000,000 mg||25,000 ct||38,581 kcal||0.787365 st|
|6 kg||0.006614 t||13.227736 lb||211.643772 oz||0.006 t||0.005905 lt||6,000 g||6,000,000 mg||30,000 ct||46,297 kcal||0.944838 st|
|7 kg||0.007716 t||15.432358 lb||246.917734 oz||0.007 t||0.006889 lt||7,000 g||7,000,000 mg||35,000 ct||54,013 kcal||1.102311 st|
|8 kg||0.008818 t||17.636981 lb||282.191696 oz||0.008 t||0.007874 lt||8,000 g||8,000,000 mg||40,000 ct||61,729 kcal||1.259784 st|
|9 kg||0.009921 t||19.841604 lb||317.465658 oz||0.009 t||0.008858 lt||9,000 g||9,000,000 mg||45,000 ct||69,446 kcal||1.417257 st|
|10 kg||0.011023 t||22.046226 lb||352.739619 oz||0.01 t||0.009842 lt||10,000 g||10,000,000 mg||50,000 ct||77,162 kcal||1.57473 st|
|11 kg||0.012125 t||24.250849 lb||388.013581 oz||0.011 t||0.010826 lt||11,000 g||11,000,000 mg||55,000 ct||84,878 kcal||1.732203 st|
|12 kg||0.013228 t||26.455471 lb||423.287543 oz||0.012 t||0.01181 lt||12,000 g||12,000,000 mg||60,000 ct||92,594 kcal||1.889677 st|
|13 kg||0.01433 t||28.660094 lb||458.561505 oz||0.013 t||0.012795 lt||13,000 g||13,000,000 mg||65,000 ct||100,310 kcal||2.04715 st|
|14 kg||0.015432 t||30.864717 lb||493.835467 oz||0.014 t||0.013779 lt||14,000 g||14,000,000 mg||70,000 ct||108,027 kcal||2.204623 st|
|15 kg||0.016535 t||33.069339 lb||529.109429 oz||0.015 t||0.014763 lt||15,000 g||15,000,000 mg||75,000 ct||115,743 kcal||2.362096 st|
|16 kg||0.017637 t||35.273962 lb||564.383391 oz||0.016 t||0.015747 lt||16,000 g||16,000,000 mg||80,000 ct||123,459 kcal||2.519569 st|
|17 kg||0.018739 t||37.478585 lb||599.657353 oz||0.017 t||0.016732 lt||17,000 g||17,000,000 mg||85,000 ct||131,175 kcal||2.677042 st|
|18 kg||0.019842 t||39.683207 lb||634.931315 oz||0.018 t||0.017716 lt||18,000 g||18,000,000 mg||90,000 ct||138,891 kcal||2.834515 st|
|19 kg||0.020944 t||41.88783 lb||670.205277 oz||0.019 t||0.0187 lt||19,000 g||19,000,000 mg||95,000 ct||146,607 kcal||2.991988 st|
|20 kg||0.022046 t||44.092452 lb||705.479239 oz||0.02 t||0.019684 lt||20,000 g||20,000,000 mg||100,000 ct||154,324 kcal||3.149461 st|
- International Bureau of Weights and Measures, The International System of Units, 9th Edition, 2019, https://www.bipm.org/utils/common/pdf/si-brochure/SI-Brochure-9.pdf