Cups to Grams Converter
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Convert a volume in US cups to grams using ingredient-specific density — flour and sugar are not the same weight per cup.
Cups & ingredient
Weight
120 g
1 cup of all-purpose flour
- Grams
- 120 g
- Ounces
- 4.2 oz
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Why ingredient matters
A cup measures volume, not weight, so the same cup holds a different mass depending on the ingredient. A cup of all-purpose flour weighs about 120 g, while a cup of honey weighs about 340 g — nearly three times as much — because honey is denser and flour has air pockets between particles.
For baking accuracy, weighing ingredients on a kitchen scale removes the variability of how tightly flour is packed into a measuring cup (scooped vs. spooned-and-leveled can differ by 20 g or more). These gram figures are common baking references, not laboratory measurements, so treat them as reliable estimates.
Example: a recipe calling for 2½ cups of granulated sugar needs about 500 g (2.5 × 200 g per cup). The same 2½ cups of all-purpose flour is only about 300 g (2.5 × 120 g) — proof that cup-to-gram conversion must be ingredient-specific.
Common questions
Why does 1 cup of flour weigh less than 1 cup of sugar?
Granulated sugar packs more densely than flour, which traps air between particles. Flour is about 120 g per cup while granulated sugar is about 200 g per cup.
Is scooping or spooning flour more accurate?
Spooning flour into the cup and leveling with a knife gives a lighter, more consistent result than scooping directly from the bag, which compacts the flour and can add 10–20% extra weight.
Should I just use a kitchen scale instead?
Weighing ingredients is more precise than measuring by volume, especially for baking. Use this converter as a solid approximation when a scale is not available.