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Metric Ton (t) Kilonewton (kN) Kilogram (kg) Hectogram (hg) Gram (g) Carat Centigram Milligram (mg) Microgram (µg) Nanogram (ng) Atomic mass unit (u)   Avoirdupois (U.S.) Long ton Short ton Long hundredweight Short hundredweight Stone Pound (lb) Ounce Dram (dr) Grain (gr)   Troy Pound Ounce Pennyweight Carat Grain Mite Doite   Japanese Koku Kann Kinn Monnme   Chinese Tael Ku ping   Old Swedish Skeppspund Lispund Skålpund Mark Uns Lod 0 decimals 1 decimals 2 decimals 3 decimals 4 decimals 5 decimals 6 decimals 7 decimals 8 decimals 9 decimals 10 decimals

The kilogram or kilogramme, (symbol: kg) is the SI base unit of mass. It is defined as being equal to the mass of the international prototype of the kilogram. It is the only SI base unit that employs a prefix, and the only SI unit that is still defined in relation to an artifact rather than to a fundamental physical property. A kilogram is equivalent to 2.205 avoirdupois pounds in the Imperial system that is used in the United States.
In the physical sciences, weight is the downward force exerted on matter as a result of gravity. An object's weight is equal to its mass multiplied by the magnitude of the gravitational field. The word entered Old English sometime around the 9th century, and meant the quantity measured with a balance. The word "weight" is commonly used synonymously with "mass", though the two concepts are technically quite distinct. >> Read more