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This article is about the unit of mass. For other uses of "g" "gram" and "gramme", see Gram (disambiguation).
The mass of this pen cap is about 1 gram
The mass of this pen cap is about 1 gram
Unit information
Unit system SI derived unit
Unit of Mass
Symbol g 
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[edit]

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).


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.


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.

Conversion factors[edit]


See also[edit]


  1. ^ "Weights and Measures Act 1985 (c. 72)". The UK Statute Law Database. Office of Public Sector Information. Retrieved 2011-01-26. "§92." 
  2. ^ Décret relatif aux poids et aux mesures, 1795
  3. ^ National Institute of Standards and Technology (October 2011). Butcher, Tina; Cook, Steve; Crown, Linda et al. eds. "Appendix C – General Tables of Units of Measurement" (PDF). Specifications, Tolerances, and Other Technical Requirements for Weighing and Measuring Devices. NIST Handbook. 44 (2012 ed.). Washington, D.C.: U.S. Department of Commerce, Technology Administration, National Institute of Standards and Technology. ISSN 0271-4027. OCLC 58927093. Retrieved 30 June 2012.
  4. ^ "Circulating Coin Designs". Japan Mint. Retrieved 7 March 2010. 

External links[edit]