How many grams in a cup of rolled oats?

1 cup of rolled oats weighs 81 grams (2.9 oz). Half a cup is 41 grams and a tablespoon is about 5.1 grams. Use the converter for any other amount.

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1 cup of rolled oats weighs

81 g

2.9 oz

Cups of rolled oats to grams

Cups	Grams	Ounces
⅛ cup	10 g	0.4 oz
¼ cup	20 g	0.7 oz
⅓ cup	27 g	1 oz
½ cup	41 g	1.4 oz
⅔ cup	54 g	1.9 oz
¾ cup	61 g	2.1 oz
1 cup	81 g	2.9 oz
1½ cups	122 g	4.3 oz
2 cups	162 g	5.7 oz
3 cups	243 g	8.6 oz
4 cups	324 g	11.4 oz
1 tablespoon	5.1 g	0.2 oz
1 teaspoon	1.7 g	0.1 oz

Grams of rolled oats to cups

Grams	Cups	In measuring cups and spoons
25 g	0.31	¼ cup + 1 tbsp
50 g	0.62	½ cup + 2 tbsp
100 g	1.23	1 cup + 3⅔ tbsp
125 g	1.54	1½ cups + ⅔ tbsp
150 g	1.85	1¾ cups + 1⅔ tbsp
200 g	2.47	2⅓ cups + 2⅓ tbsp
250 g	3.09	3 cups + 1⅓ tbsp
300 g	3.7	3⅔ cups + ⅔ tbsp
500 g	6.17	6 cups + 2⅔ tbsp
1000 g	12.35	12⅓ cups + ⅓ tbsp

Measuring rolled oats

Old-fashioned and quick oats weigh about the same per cup. Steel-cut oats are much denser.

These weights come from the USDA FoodData Central and assume a level US cup of 236.6 milliliters. For example, 1½ cups of rolled oats is 122 grams.

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Frequently asked questions

How many grams is 1 cup of rolled oats?

1 cup of rolled oats weighs 81 grams, or 2.9 ounces, measured in a level US cup.

How many grams is ½ cup of rolled oats?

½ cup of rolled oats weighs 41 grams. ¼ cup weighs 20 grams.

How many grams are in a tablespoon of rolled oats?

1 tablespoon of rolled oats weighs about 5.1 grams, and 1 teaspoon about 1.7 grams.

How many cups is 100 grams of rolled oats?

100 grams of rolled oats is 1.23 cups, or about 1 cup + 3⅔ tbsp.

Last updated November 5, 2026 · Sources: USDA FoodData Central

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