How many grams in a cup of flour?

1 US cup of all-purpose flour ≈ 120 g (King Arthur Baking, spoon-and-level). 1 metric cup (250 mL) ≈ 127 g. Packing density changes the answer by 10–25%, so use a kitchen scale when accuracy matters.

Are US, metric and Imperial cups the same?

No. A US cup is 236.59 mL, a metric cup is 250 mL, an Imperial cup is 284.13 mL. Recipes don't always specify which — toggle the cup origin in the converter to match the recipe.

Is the cooking converter accurate enough for baking?

For precision baking, a kitchen scale beats any cup. We surface an "Approximate" badge for volume↔mass cooking conversions because flour packing density varies materially.

Cooking conversions

A cup of flour does not weigh the same as a cup of sugar. This converter knows. Pick your ingredient below to get an accurate cup-to-gram (or gram-to-cup) result, and toggle between US, metric and Imperial cup sizes.

Realtime·volume·us

Approx

From

cup (US)

× ρ

Result

236.5882

Ingredient · density-awareρ = 1.000 g/mL

Approximate. Packing density of flour/brown sugar can shift by 10–25%. For baking, a kitchen scale beats any cup measure.

Precision [auto]

Why this matters

• A US cup is 236.59 mL; a metric cup is 250 mL; an Imperial cup is 284.13 mL. Recipes don't always say which.
• A US tablespoon is 14.79 mL; a metric tablespoon is 15 mL; an Australian tablespoon is 20 mL.
• Flour weight depends on whether you scoop-and-level or spoon-and-level. King Arthur Baking lists 1 cup AP flour = 120 g (spooned & leveled).
• For baking accuracy, a $15 kitchen scale beats any cup measure.

Popular cooking conversions

Ingredient densities used

We use widely-published densities from King Arthur Baking, USDA FoodData Central and standard culinary references.

Ingredient	Density (g/mL)	1 US cup ≈	1 metric cup ≈
All-purpose flour (spooned & leveled)	0.529	125 g	132 g
Bread flour	0.550	130 g	138 g
Cake flour	0.473	112 g	118 g
Whole wheat flour	0.549	130 g	137 g
Almond flour	0.406	96 g	102 g
Rice flour	0.550	130 g	138 g
Granulated sugar (white)	0.845	200 g	211 g
Powdered sugar (confectioner’s)	0.507	120 g	127 g
Brown sugar (packed)	0.930	220 g	232 g
Brown sugar (loose)	0.592	140 g	148 g
Honey	1.420	336 g	355 g
Maple syrup	1.320	312 g	330 g
Water	1.000	237 g	250 g
Milk (whole)	1.030	244 g	258 g
Heavy cream	0.994	235 g	249 g
Buttermilk	1.035	245 g	259 g
Olive oil	0.913	216 g	228 g
Vegetable oil	0.920	218 g	230 g
Butter (melted)	0.911	216 g	228 g
Butter (softened)	0.959	227 g	240 g
Peanut butter	1.080	256 g	270 g
Long-grain rice (uncooked)	0.790	187 g	198 g
Short-grain rice (uncooked)	0.850	201 g	213 g
Rolled oats	0.345	82 g	86 g
Breadcrumbs (dry)	0.467	110 g	117 g
Almonds (whole)	0.582	138 g	146 g
Walnuts (chopped)	0.467	110 g	117 g
Chia seeds	0.711	168 g	178 g
Cocoa powder	0.590	140 g	148 g
Salt (table)	1.217	288 g	304 g
Salt (kosher, Diamond Crystal)	0.586	139 g	147 g
Cornstarch	0.541	128 g	135 g
Baking powder	0.972	230 g	243 g