How Many Grams in a Cup of All-Purpose Flour?
Updated September 25, 2026
1 US cup of all-purpose flour
120g
4.2 oz, spooned into the cup and leveled
- 1/2 cup
- 60 g
- 1/4 cup
- 30 g
- 1 tablespoon
- 7.5 g
- 1 teaspoon
- 2.5 g
One US cup of all-purpose flour weighs 120 grams (about 4¼ ounces) when you spoon the flour into the cup and level it off. Dip the cup straight into the bag instead and the flour packs down, so the same cup ends up noticeably heavier. That extra flour is one of the most common reasons cookies turn out dry and cakes dense.
All-Purpose Flour converter
Fractions work too, for example 1/3 or 1 1/2.
Cups to grams
| US cups | Grams | Ounces |
|---|---|---|
| 1/8 cup | 15 g | 0.53 oz |
| 1/4 cup | 30 g | 1.1 oz |
| 1/3 cup | 40 g | 1.4 oz |
| 1/2 cup | 60 g | 2.1 oz |
| 2/3 cup | 80 g | 2.8 oz |
| 3/4 cup | 90 g | 3.2 oz |
| 1 cup | 120 g | 4.2 oz |
| 1 1/2 cups | 180 g | 6.3 oz |
| 2 cups | 240 g | 8.5 oz |
| 3 cups | 360 g | 12.7 oz |
| 4 cups | 480 g | 16.9 oz |
Grams to cups
| Grams | Cups (decimal) | With measuring cups and spoons |
|---|---|---|
| 25 g | 0.21 | 3 tbsp + 1 tsp |
| 50 g | 0.42 | 1/3 cup + 1 tbsp + 1 tsp |
| 100 g | 0.83 | 3/4 cup + 1 tbsp + 1 tsp |
| 150 g | 1.25 | 1 1/4 cups |
| 200 g | 1.67 | 1 2/3 cups |
| 250 g | 2.08 | 2 cups + 1 tbsp + 1 tsp |
| 300 g | 2.5 | 2 1/2 cups |
| 400 g | 3.33 | 3 1/3 cups |
| 500 g | 4.17 | 4 cups + 2 tbsp + 2 tsp |
| 1,000 g | 8.33 | 8 1/3 cups |
Why you'll see 120, 125 or 140 grams
Published weights for a cup of all-purpose flour range from about 120 to 140 grams. King Arthur Baking's chart uses 120 g, which reflects spooning and leveling. America's Test Kitchen works with about 5 ounces, roughly 140 g, a figure closer to what you get by dipping the cup and sweeping it level. Many bakers split the difference and use 125 g as a round number.
None of these is wrong; they describe different ways of filling a cup. If a recipe doesn't say how it measures flour, 120–125 g per cup is a sensible starting point, and you can add a spoonful more if the dough looks too wet.
Tips for measuring all-purpose flour
- Stir or whisk the flour in its bag or canister first. Flour settles during shipping and storage, and settled flour weighs more per cup.
- Spoon the flour into a dry measuring cup until it mounds over the rim, then sweep off the excess with the back of a knife. Don't tap the cup or press the flour down.
- Bread flour and cake flour weigh about the same per cup as all-purpose in King Arthur's chart (120 g), but they don't bake the same. Bread flour has more protein for chewy loaves; cake flour has less for tender crumbs.
- If you bake often, an inexpensive digital kitchen scale is the single biggest upgrade to consistency. Set the bowl on the scale, press tare, and add flour until you reach the gram weight.
Frequently asked questions
Is a cup of flour 120 g or 125 g?
Both are in common use. 120 g comes from King Arthur Baking's ingredient chart, and 125 g is a round figure many bakers and cookbooks use. The 5-gram gap is less than a tablespoon and rarely matters at home. Much bigger differences, such as 140 g or more, usually come from scooping the cup into the bag.
Does sifted flour weigh less per cup?
Yes. Sifting adds air, so a cup measured after sifting holds less flour. Read the wording carefully: "1 cup sifted flour" means sift first, then measure; "1 cup flour, sifted" means measure first, then sift.
How many grams are in 1/2 cup of all-purpose flour?
Half a cup of all-purpose flour weighs about 60 grams (2.1 ounces).
How many cups is 100 grams of all-purpose flour?
100 g of all-purpose flour is about 0.83 US cups, which you can measure as 3/4 cup + 1 tbsp + 1 tsp.
How many grams are in a tablespoon of all-purpose flour?
One tablespoon weighs about 7.5 g, and one teaspoon about 2.5 g.
More cups-to-grams conversions
See every ingredient side by side in the baking ingredient weight chart, or convert cups, spoons and milliliters with the kitchen unit converter.
Sources and method
The cup weight on this page comes from King Arthur Baking's Ingredient Weight Chart, which lists all-purpose flour as 1 cup = 4 1/4 oz = 120 g. All other figures are calculated from that weight using a US customary cup (236.6 mL), 16 tablespoons per cup and 3 teaspoons per tablespoon. Using a 250 mL metric cup? Multiply the grams by about 1.06. Brand, humidity and measuring technique can shift real-world weights by a few percent, so weigh when precision matters.