How many grams in a cup of all-purpose flour?

1 cup of all-purpose flour weighs 120 g by King Arthur Baking's chart. USDA lists 125 g. Either works; how you fill the cup matters more than which figure you pick.

Sources: King Arthur Baking ingredient weight chart, USDA FoodData Central · Checked October 10, 2026

Amount

Unit

120 g 4.2 oz

Sources range from 120 g to 125 g for 1 cup.

Converting a whole recipe?

Sous Chef converts every ingredient in a recipe to grams and millilitres in one tap, rounded to amounts you would actually weigh.

All-purpose flour cups to grams table

Using 120 g per US cup. A US cup is 236.6 mL; 1 cup is 16 tablespoons.

All-purpose flour cups to grams
US cups	Grams	Ounces	Tablespoons
⅛ cup	15 g	0.5 oz	2
¼ cup	30 g	1.1 oz	4
⅓ cup	40 g	1.4 oz	5.3
½ cup	60 g	2.1 oz	8
⅔ cup	80 g	2.8 oz	10.7
¾ cup	90 g	3.2 oz	12
1 cup	120 g	4.2 oz	16
1½ cups	180 g	6.3 oz	24
2 cups	240 g	8.5 oz	32
3 cups	360 g	12.7 oz	48
4 cups	480 g	16.9 oz	64

Why sources disagree

Flour compresses. A cup scooped straight from the bag holds more flour than a cup filled lightly with a spoon, so two careful bakers can measure different weights from the same cup. The 5 g gap between King Arthur and USDA is small next to that. If a recipe lists grams, weigh and skip the cup.

Source	Listed as	Grams per cup
King Arthur Baking ingredient weight chart All-Purpose Flour	1 cup = 120 g	120 g
USDA FoodData Central Wheat flour, white, all-purpose, enriched, bleached	1 cup = 125 g	125 g

Bold row is the figure the calculator uses. Figures listed for a smaller measure are multiplied up to one cup.

How to measure all-purpose flour accurately

Fluff the flour with a spoon, then spoon it into the cup instead of scooping, which packs it.
Weigh on a digital scale when you can, since cup scoops vary from cook to cook.
If you use cups, fill the same way every time so your results stay consistent.

Convert the whole recipe, not one line

Converting a recipe one ingredient at a time is where mistakes slip in. Sous Chef imports a recipe from a link or pasted text, then converts every ingredient at once: dry ingredients and butter to grams, liquids to millilitres. Tap again to go back to cups.

US recipe

2¼ cups all-purpose flour
1 cup butter, softened
¾ cup brown sugar, packed
1½ cups milk

In Sous Chef, after "Convert to metric"

275 g all-purpose flour
225 g butter, softened
170 g brown sugar, packed
350 ml milk

Example output. Sous Chef rounds to amounts you would actually weigh, so its numbers can differ by a few grams from the table above.

Common questions

How many grams is half a cup of all-purpose flour?

Half a cup of all-purpose flour is about 60 g, using 120 g per cup.

How many grams is 1 tablespoon of all-purpose flour?

1 tablespoon of all-purpose flour is about 8 g, since 1 cup is 16 tablespoons and 120 g per cup divided by 16 is 8 g.

More conversions

Cook in grams without doing the math.

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