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The kilogram is the base unit of mass in the International System of Units (SI).
One kilogram (kg) is equal to 1,000 grams (g) or 106 milligrams (mg) (SI units of mass), or 0.001 tonnes (t) (a unit of mass in the metric system), or approximately 2.20462 pounds (lb) or 35.27396 ounces (oz), which are US customary / Imperial units of mass.
Although the kilogram is the base unit of mass in the SI, within the name or symbol of an SI unit of mass the SI prefixes are used in combination with "gram" and not "kilogram" which already has a prefix (kilo-) included in its name. Examples of SI units of mass include: picogram, nanogram, microgram, milligram, centigram, decigram, etc.
The kilogram is the only base unit of measurement in the International System of Units that has an SI prefix as part of its name.
Also known as: kilogramme (plural: kilogrammes, traditional British-English spelling)