All-purpose flour grams to cups
To convert grams to cups, divide the grams by 120. For example, 100 g of all-purpose flour ≈ 0.83 cup.
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All-purpose flour is the ingredient where grams beat cups by the widest margin. Scoop a cup straight from the bag and you can pack in 150g or more; spoon and level and you get the standard 120g. That 30g gap quietly ruins cakes and bread.
All-purpose flour grams to cups chart (US cup)
| Grams | Cups (approx.) | Decimal cups |
|---|---|---|
| 25 g | 0.21 cup | 0.21 |
| 50 g | 0.42 cup | 0.42 |
| 75 g | 0.62 cup | 0.62 |
| 100 g | 0.83 cup | 0.83 |
| 125 g | 1 cup | 1.04 |
| 150 g | 1¼ cups | 1.25 |
| 175 g | 1.46 cups | 1.46 |
| 200 g | 1⅔ cups | 1.67 |
| 250 g | 2.08 cups | 2.08 |
| 300 g | 2½ cups | 2.5 |
| 400 g | 3⅓ cups | 3.33 |
| 500 g | 4.17 cups | 4.17 |
Why all-purpose flour weighs what it does
A cup of all-purpose flour weighs about 120g when spooned and leveled, but flour is a powder full of trapped air, so how you fill the cup matters more than almost any other ingredient. Plunging the cup into the bag compresses it to 140-150g. Sifted, fluffed flour can drop to 110g. Brands differ too: King Arthur lists 120g per cup while Gold Medal uses 130g. Humidity also adds weight as flour absorbs moisture. This is why serious bakers weigh.
How to measure all-purpose flour
Use the spoon-and-level method for 120g: stir the flour in its container to loosen it, spoon it lightly into the measuring cup until heaping, then sweep the excess off with a straight edge. Never tap, shake, or scoop directly from the bag. For real accuracy, set a scale to zero and weigh.
Common mistake
The big one is scooping the cup directly into the flour bag, which compacts it and adds 20-30g per cup without you noticing. Across a 3-cup cake recipe that is nearly a full extra cup of flour, giving you dense, dry results. Many also forget to re-fluff settled flour first.
Other cup sizes
| Cup type | 1 cup of all-purpose flour |
|---|---|
| US cup (240 ml) | 120 g |
| Metric cup (250 ml) | 125 g |
| Australian / South African cup (250 ml) | 125 g |
| Imperial cup (284 ml) | 142 g |
Where it matters
All-purpose flour is the backbone of cookies, cakes, muffins, quick breads, pancakes, and roux. Conversion precision matters most in tender bakes like sponge cakes and chiffon, where excess flour kills the rise, and in cookies, where it controls spread. Weighing keeps every batch consistent regardless of who is measuring.
FAQ
Why is 1 cup of flour 120 grams here when other sites say 125 or 130?
It depends on the assumed measuring method and brand. 120g reflects spoon-and-level with a typical brand like King Arthur. Gold Medal and some sources use 125-130g because they assume a slightly denser fill. The differences are real, which is exactly why weighing is more reliable than cups.
Does sifting change how many grams are in a cup?
Yes. Sifting aerates the flour, so a cup of sifted flour can weigh as little as 110g versus 120g unsifted. If a recipe says 'sift, then measure' you'll get less flour by weight than 'measure, then sift.' When in doubt, weigh the flour and sift afterward.
Can I use the same gram weight for bread flour or cake flour?
Not exactly. Bread flour is similar at around 120-127g per cup, but cake flour is lighter and fluffier at roughly 113-120g. If you substitute, weigh rather than relying on the cup, since the densities and protein content differ enough to affect texture.
How do I convert if my recipe is in cups but I want to weigh?
Multiply the number of cups by 120. So 2 cups is 240g, and 1.5 cups is 180g. For fractional amounts, 1/2 cup is 60g, 1/3 cup is 40g, and 1/4 cup is 30g. Weighing eliminates the scoop-versus-spoon guesswork entirely.