Gram to Cup

300 grams of all-purpose flour to cups

300 g of all-purpose flour is about 2.5 cups, which is roughly 2 cups + 1/2 or 40 tablespoons. That comes from 120 g per US cup. Assumes spoon-and-level. Scooped flour runs closer to 140 g a cup.

Measure300 g of all-purpose flour
Cups2.5
Kitchen measure2 cups + 1/2
Tablespoons40
Grams per cup used120 g

Flour is the ingredient where cup measuring goes wrong most often. It compresses easily, so the same cup can hold anywhere from 120 g when spooned in gently to 145 g when the cup is dipped straight into the bag. That swing is about two extra tablespoons, enough to turn a chewy cookie dry or a tender cake dense.

Result
0.83 cups
About 7/8 cup of all-purpose flour. 100 g is 3.53 oz by weight.
Assumes spoon-and-level. Scooped flour runs closer to 140 g a cup.

Questions

How many cups is 300 g of all-purpose flour?
2.5 cups, or about 2 cups + 1/2. That is worked out at 120 g per US cup, and a cup of all-purpose flour can run 120 to 145 g depending on how the cup is filled.
How many tablespoons is 300 g of all-purpose flour?
About 40 tablespoons, since one US cup is 16 tablespoons. For small amounts tablespoons are usually the more accurate measure to work with.
Why does 300 g give a different number of cups for other ingredients?
Because cups measure volume and grams measure weight. 300 g of all-purpose flour is 2.5 cups at 120 g per cup, while the same 300 g of a denser or lighter ingredient fills a different amount of space.

Other amounts of all-purpose flour

227 g230 g240 g250 g260 g270 g280 g320 g340 g350 g

See all all-purpose flour conversions or 300 g of every other ingredient.