In the metric system, non-liquid ingredients are measured in grams. Sometimes it is necessary to convert measurements for recipes from grams to the appropriate number of ounces or cups. While a cup is a common cooking measure used in the U.S., the metric system measures the mass of a substance rather than its weight. Unlike weight, which is simply a measure of how heavy a substance is, mass measures the actual amount of something and is unaffected by gravity. For this reason, different ingredients can have different metric measures. Therefore, the number of grams it takes to equal one cup differs depending on the ingredient.
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Things you need
- Conversion table
Find a table that converts the measurements of common cooking ingredients (see Resources).
Take into account that weight in grams varies depending on the density of the ingredient being measured. One cup is an average measurement, but grams give you a more exact measure for an ingredient. Even though the number of grams in ingredients can vary according to their density, on average 1 gram measures approximately .035 oz.
Change the weight of a non-liquid ingredient from grams to cups by comparing the metric measure with the standard American system of unit measurements. For example, 28.4gr in weight is the standard measure for the metric equivalent of about 28 grams. But when converting grams to ounces, multiply the number of grams by .035.
Divide the total number of grams of an ingredient by the average number of grams in 28.4gr to arrive at the measurement in ounces.
Divide the total number of ounces by 8 to find the measurement in cups (there are 227gr in 1 cup). Round off the measurement if necessary.
Tips and warnings
- Fluid ounces and dry ounces differ. One unit measures volume, and the other unit measures weight.
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