400 grams of all-purpose flour to cups
400 grams of all-purpose flour is 3.33 cups — near enough 3 1/3 cups.
The answer
3.33 cups
≈ 3 1/3 cups
Worked out from 120 grams per US cup: 400 ÷ 120 = 3.33. 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. All-Purpose Flour has 3 measured techniques on record, and they differ enough to matter — see the full all-purpose flour page for the comparison.