Gram to Cup

120 grams of rolled oats to cups

120 g of rolled oats is about 1.33 cups, which is roughly 1 cup + 1/3 or 21.33 tablespoons. That comes from 90 g per US cup. Old-fashioned rolled oats, loosely filled.

Measure120 g of rolled oats
Cups1.33
Kitchen measure1 cup + 1/3
Tablespoons21.33
Grams per cup used90 g

Rolled oats are mostly air. The flakes stack loosely, so a full cup weighs only about 90 g, one of the lightest entries on this site. Do not pack them down; recipes assume a loose fill.

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 120 g of rolled oats?
1.33 cups, or about 1 cup + 1/3. That is worked out at 90 g per US cup.
How many tablespoons is 120 g of rolled oats?
About 21.33 tablespoons, since one US cup is 16 tablespoons. For small amounts tablespoons are usually the more accurate measure to work with.
Why does 120 g give a different number of cups for other ingredients?
Because cups measure volume and grams measure weight. 120 g of rolled oats is 1.33 cups at 90 g per cup, while the same 120 g of a denser or lighter ingredient fills a different amount of space.

Other amounts of rolled oats

85 g90 g100 g110 g112 g113 g115 g125 g140 g150 g

See all rolled oats conversions or 120 g of every other ingredient.