Gram to Cup

30 grams of rolled oats to cups

30 g of rolled oats is about 0.33 cups, which is roughly 1/3 cup or 5.33 tablespoons. That comes from 90 g per US cup. Old-fashioned rolled oats, loosely filled.

Measure30 g of rolled oats
Cups0.33
Kitchen measure1/3 cup
Tablespoons5.33
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 30 g of rolled oats?
0.33 cups, or about 1/3 cup. That is worked out at 90 g per US cup.
How many tablespoons is 30 g of rolled oats?
About 5.33 tablespoons, since one US cup is 16 tablespoons. For small amounts tablespoons are usually the more accurate measure to work with.
Why does 30 g give a different number of cups for other ingredients?
Because cups measure volume and grams measure weight. 30 g of rolled oats is 0.33 cups at 90 g per cup, while the same 30 g of a denser or lighter ingredient fills a different amount of space.

Other amounts of rolled oats

15 g20 g24 g25 g28 g32 g33 g35 g39 g40 g

See all rolled oats conversions or 30 g of every other ingredient.