One gram equals 0.035274 grams, to convert 21 grams to ounces we have to multiply the amount of grams by 0.035274 to obtain amount in ounces. 21 grams is equal to 21 x 0.035274 = 0.740754 ounces.
A gram (symbol: g) is a metric unit of mass equal to one thousandth of a kilogram. The gram is today the most widely used unit of measurement for non-liquid ingredients in cooking and grocery shopping worldwide.
The ounce (symbol: oz) is a unit of mass with several definitions, the most popularly used being equal to approximately 28 grams. The size of an ounce varies between systems. Today, the most commonly used ounces are the international avoirdupois ounce (equal to 28.3495231 grams) and the international troy ounce (equal to 31.1034768 grams).
To calculate a gram value to the corresponding value in ounces, just multiply the quantity in kilogram by 0.035274 (the conversion factor).
Ounces = Grams * 0.035274
The factor 0.035274 is the result from the division 1 / 28.3495 (ounce definition). Therefore, another way would be:
Ounces = Grams / 28.3495
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