Last updated: October 2026
How many grams are in a cup? It depends on the ingredient
Short answer: a cup is volume, grams are weight — 1 cup of all-purpose flour is 120 g, but 1 cup of honey is 340 g. Pick your ingredient above and convert cups ↔ grams, tbsp, ml or oz in either direction.
Why ingredient-aware matters
Most converters use one fixed number, which is wrong for almost everything. Flour (120 g/cup), granulated sugar (200 g/cup), butter (227 g/cup) and honey (340 g/cup) differ by nearly 3x. This converter uses published densities (King Arthur Baking, USDA) for 23 common ingredients, so baking conversions actually work.
Quick reference
1 cup water = 237 g · 1 cup milk = 245 g · 1 cup flour = 120 g · 1 cup sugar = 200 g · 1 cup butter = 227 g · 1 cup honey = 340 g · 1 cup rolled oats = 90 g · 1 cup cocoa = 100 g. A US cup is 236.6 ml (a metric cup is 250 ml — about 6% larger).
Frequently asked questions
How many grams are in a cup of flour?
1 US cup of all-purpose flour weighs 120 grams (King Arthur standard). Bread flour is 127 g, whole wheat 113 g, cake flour 114 g. Select your flour type in the converter above for the exact number.
How many grams are in a cup of sugar?
1 cup of granulated sugar is 200 g, packed brown sugar is 220 g, and powdered sugar is 120 g. A cup is a volume — the weight depends on the ingredient, which is why this converter asks what you're measuring.
How do I convert grams back to cups?
Pick your ingredient, enter the grams, and set the target unit to cups — the converter works both directions. For example, 250 g of all-purpose flour is about 2.08 cups.
Is a US cup the same as a metric cup?
No — a US cup is 236.6 ml while a metric cup (used in Australia and some recipes) is 250 ml, about 6% larger. This converter uses the US cup; for metric-cup recipes, convert via milliliters.
Why does a cup of honey weigh more than a cup of flour?
Density. A cup of honey weighs 340 g versus 120 g for flour — nearly 3x — because honey is far denser. That's why volume-to-weight conversion must be ingredient-aware; a single 'cups to grams' number is always wrong for something.