# Gram

Gram
The mass of this pen cap is about 1 gram
Unit information
Unit systemSI derived unit
Unit ofMass
Symbolg
Unit conversions
1 g in ...... is equal to ...
SI base units   10-3 kilograms
CGS units   1 gram
U.S. customary   0.0353 ounces

Gram
The mass of this pen cap is about 1 gram
Unit information
Unit systemSI derived unit
Unit ofMass
Symbolg
Unit conversions
1 g in ...... is equal to ...
SI base units   10-3 kilograms
CGS units   1 gram
U.S. customary   0.0353 ounces

The gram (alternative British English spelling: gramme;[1] SI unit symbol: g) (Greek/Latin root grámma) is a metric system unit of mass.

Originally defined as "the absolute weight of a volume of pure water equal to the cube of the hundredth part of a metre, and at the temperature of melting ice"[2] (later 4 °C), a gram is now defined as one one-thousandth of the SI base unit, the kilogram, or 1×10−3 kg, which itself is defined as being equal to the mass of a physical prototype preserved by the International Bureau of Weights and Measures.

## Symbol and abbreviations

The International System of Units (SI) unit symbol for the gram is "g" following the numeric value with a space, as in "640 g". It is not "gr" (which is the symbol for grains)[3]:C-19, "gm" (easily mistaken for "mg", milligrams) or "Gm" (giga-metre).

## History

It was the base unit of mass in the original French metric system and the later centimetre-gram-second (CGS) system of units. The word originates from Late Latin gramma – a small weight.

## Uses

The gram is today the most widely used unit of measurement for non-liquid ingredients in cooking and grocery shopping worldwide.

Most standards and legal requirements for nutrition labels on food products require relative contents to be stated per 100 g of the product, such that the resulting figure can also be read as a percentage.