Grams to cups for rolled oats

One US cup of rolled oats weighs about 90 g, so 100 g is about 1.11 cups (1 cup + 1/8). Old-fashioned, loose. The calculator and table below use this figure for any amount.

IngredientGrams

Result

1.11 cups

About 1 cup + 1/8 of rolled oats. 100 g is 3.53 oz by weight.

Old-fashioned rolled oats, loosely filled.

Conversion table

Grams	Cups	Closest kitchen measure
25 g	0.28	1/4 cup
50 g	0.56	1/2 cup
75 g	0.83	7/8 cup
100 g	1.11	1 cup + 1/8
125 g	1.39	1 cup + 3/8
150 g	1.67	1 cup + 2/3
200 g	2.22	2 cups + 1/4
250 g	2.78	2 cups + 3/4
300 g	3.33	3 cups + 1/3
400 g	4.44	4 cups + 1/2
500 g	5.56	5 cups + 1/2

How to measure it

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.

Quick oats are cut smaller and settle tighter, landing closer to 95 g a cup. Steel cut oats are dense whole pieces at about 160 g a cup, so never swap them into a conversion meant for rolled oats.

For granola and cookies the difference between 85 g and 95 g rarely matters. For a structured bake like oat flour cake, grind then weigh.

Density source: Published baking company ingredient charts. Method assumed: Old-fashioned rolled oats, loosely filled.

Questions about rolled oats

How many cups is 100 g of oats?

About 1.11 cups of old-fashioned rolled oats, so a level cup plus a heaped tablespoon.

Are quick oats the same conversion?

Close. Quick oats run about 95 g a cup because the smaller flakes settle tighter. The 90 g figure is for old-fashioned rolled oats.

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