How many grams in an ounce?


There is 28.35 grams (metric system) in 1 ounce (British Imperial and US Standards for weights and measures). Both the gram and the ounce are measurements of mass.

The gram (or alternative British English spelling: gramme) is a metric system unit of mass, the word gram originates from the Late Latin word gramma, which means a small weight. The original definition of gram was “the absolute weight of volume of pure water to the cube of the hundredth part of a meter, and at the temperature of melting ice.”  The current definition of a gram is “one one-thousandth of the SI base unit, the kilogram, or 1×10−3 kg. A gram was used at the base unit of mass in the original French metric system and the centimetre-gram-second (CGS) system of units that proceeded the original French metric system.

The ounce (abbreviation: oz) is a form of measuring mass, has several definitions, the most common of which being a unit of measurement equal to approximately 28 grams. described  originates from the Latin word uncia, meaning a unit of measurement equal to one-twelfth (1/12) of a Roman pound called a libra. Ounce was introduced into modern language first in Old English as ynsan or yndsan through an unattested Vulgar Latin form with the c before i, then ounce was used in Middle English through Anglo-Norman and Middle French (unce, once, ounce). Now the ounce is used in many different measurement systems, including measurements of mass that form part of the United States customary, and imperial, systems. The size of an ounce varies between systems. The two ounces most commonly used today are the international avoirdupois ounce and the international troy ounce.

Other instances of how many grams are in an ounce:

  • 28.35 grams =  1 avoirdupois ounce
  • 31.10 gm = 1 troy ounce – is used for weighing precious metals such gold
  • 29.57 ml = 1 fluid ounce


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