100 grams of powdered sugar to cups
100 grams of powdered sugar is 0.83 cups — near enough 3/4 cup + 1 tbsp + 1 tsp.
The answer
0.83 cups
≈ 3/4 cup + 1 tbsp + 1 tsp
Worked out from 120 grams per US cup: 100 ÷ 120 = 0.83. Approximate — density shifts with packing and brand.
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≈
Based on g per cup. Approximate — density varies with packing and brand.
How you measure it changes this
The figure above assumes spooned & levelled. Powdered Sugar has 2 measured techniques on record, and they differ enough to matter — see the full powdered sugar page for the comparison.