World Library  
Flag as Inappropriate
Email this Article


Article Id: WHEBN0000549118
Reproduction Date:

Title: Grams  
Author: World Heritage Encyclopedia
Language: English
Subject: Milo (drink)
Publisher: World Heritage Encyclopedia


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
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

The International System of Units (SI) unit symbol for the gram is "g" following the numeric value with a space, as in "640 g". While some authors use ad hoc abbreviations, this creates confusion. For example, the use of abbreviations such as "gm", "Gm", or "GM" for grams could potentially lead to serious errors in health-care settings where accidentally transposing "gm" to "mg" (milligrams) could result in a 1,000 times dosage error. It is therefore important to use "g" as specified in the SI standard to avoid confusion or misunderstanding.

A bigger mistake is using the abbreviation "gr" for grams. The symbol "gr" stands for grains.


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. For food products that are typically sold in quantities far less than 1 kg, the unit price is normally given per 100 g.

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


See also


External links

  • grams (weight) conversion to spoons (volume) as used in cooking
  • Encyclopædia Britannica
This article was sourced from Creative Commons Attribution-ShareAlike License; additional terms may apply. World Heritage Encyclopedia content is assembled from numerous content providers, Open Access Publishing, and in compliance with The Fair Access to Science and Technology Research Act (FASTR), Wikimedia Foundation, Inc., Public Library of Science, The Encyclopedia of Life, Open Book Publishers (OBP), PubMed, U.S. National Library of Medicine, National Center for Biotechnology Information, U.S. National Library of Medicine, National Institutes of Health (NIH), U.S. Department of Health & Human Services, and, which sources content from all federal, state, local, tribal, and territorial government publication portals (.gov, .mil, .edu). Funding for and content contributors is made possible from the U.S. Congress, E-Government Act of 2002.
Crowd sourced content that is contributed to World Heritage Encyclopedia is peer reviewed and edited by our editorial staff to ensure quality scholarly research articles.
By using this site, you agree to the Terms of Use and Privacy Policy. World Heritage Encyclopedia™ is a registered trademark of the World Public Library Association, a non-profit organization.

Copyright © World Library Foundation. All rights reserved. eBooks from Project Gutenberg are sponsored by the World Library Foundation,
a 501c(4) Member's Support Non-Profit Organization, and is NOT affiliated with any governmental agency or department.