One ounce equals 28.3495 grams, to convert 13 ounces to grams we have to multiply the amount of ounces by 28.3495 to obtain the amount in grams. 13 ounces is equal to 13 x 28.3495 = 368.5435 grams.
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).
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.
To calculate a ounce value to the corresponding value in grams, just multiply the quantity in ounces by 28.3495 (the conversion factor).
Grams = Ounces * 28.3495
The factor 28.3495 is the result from the division 1 / 0.035274 (ounce definition). Therefore, another way would be:
Grams = Ounces / 0.035274
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