400 grams of potato starch to cups
400 grams of potato starch is 2.63 cups — near enough 2 1/2 cups + 2 tbsp.
The answer
2.63 cups
≈ 2 1/2 cups + 2 tbsp
Worked out from 152 grams per US cup: 400 ÷ 152 = 2.63. Approximate — density shifts with packing and brand.
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Based on g per cup. Approximate — density varies with packing and brand.