Direct answer
Cup to Grams for Flour, Sugar, and Butter
A practical density-aware answer page for common cup-to-gram recipe conversions.
Question
How many grams are in a cup of flour, sugar, or butter?
Approximate US cup weights: all-purpose flour 120 g, granulated sugar 200 g, butter 227 g.
1 US cup all-purpose flour
about 120 g
1 US cup granulated sugar
about 200 g
1 US cup butter
about 227 g
Explanation
Cups measure volume, while grams measure weight. The conversion depends on ingredient density.
For recipe work, use ingredient-specific references instead of treating every cup as the same gram weight.
A US cup is about 236.588 ml; a metric cup is 250 ml.
Important caveat
Ingredient packing, brand, humidity, and measurement style can change real recipe weights.