A unit of mass, approximately 15.4324 grains. It is one thousandth of a kilogram, the unit of mass in SI and in previous versions of the metric system. Symbol, g. In Britain and in many other languages it is spelled gramme, but there is also a different unit with that name. See gramme.

A handy way for Americans to become familiar with the metric masses of small objects is to compare them to coins with “round number” masses:

Coin After Mass in grams
U.S. 1 cent (penny) 1982 2.5 ± 0.100
Euro 5 cent 1999 3.92
U.S. 5 cent (nickel) 1938 5 ± 0.194
1 Euro 1999 7.5
2 Euro 1999 8.5

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