Gram to Cup

400 grams of rolled oats to cups

400 g of rolled oats is about 4.44 cups, which is roughly 4 cups + 1/2 or 71.11 tablespoons. That comes from 90 g per US cup. Old-fashioned rolled oats, loosely filled.

Measure400 g of rolled oats
Cups4.44
Kitchen measure4 cups + 1/2
Tablespoons71.11
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 400 g of rolled oats?
4.44 cups, or about 4 cups + 1/2. That is worked out at 90 g per US cup.
How many tablespoons is 400 g of rolled oats?
About 71.11 tablespoons, since one US cup is 16 tablespoons. For small amounts tablespoons are usually the more accurate measure to work with.
Why does 400 g give a different number of cups for other ingredients?
Because cups measure volume and grams measure weight. 400 g of rolled oats is 4.44 cups at 90 g per cup, while the same 400 g of a denser or lighter ingredient fills a different amount of space.

Other amounts of rolled oats

280 g300 g320 g340 g350 g375 g425 g450 g454 g500 g

See all rolled oats conversions or 400 g of every other ingredient.