How Many Grams in a Cup of Old-Fashioned Rolled Oats?

1 cup of old-fashioned rolled oats weighs 89 grams. Every other measure is below, in both directions.

1 cup of old-fashioned rolled oats

89 g

≈ 3.14 oz

Data & method: From the King Arthur Baking ingredient weight chart. An automated test pins the figure to that published source. How we calculate →

Convert any amount

Preset to old-fashioned rolled oats — change the amount, units or ingredient to convert anything else.

Amount From To Ingredient

Result

89 g

Rolled oats (old-fashioned): 89 g per cup

Recipe now in grams? Next: scale it to your batch →

Old-Fashioned Rolled Oats: cups to grams chart

Rolled oats (old-fashioned)	Grams	Ounces
¼ cup	22 g	0.78 oz
⅓ cup	30 g	1.05 oz
½ cup	45 g	1.57 oz
⅔ cup	59 g	2.09 oz
¾ cup	67 g	2.35 oz
1 cup	89 g	3.14 oz
1½ cups	134 g	4.71 oz
2 cups	178 g	6.28 oz
3 cups	267 g	9.42 oz
1 tablespoon	5.6 g	0.2 oz
1 teaspoon	1.9 g	0.07 oz

Grams to cups: old-fashioned rolled oats

Working the other way — a recipe in grams, and cups are what you have in the drawer:

Grams of old-fashioned rolled oats	Cups (approx.)
50 g	0.56 cup
100 g	1⅛ cups
125 g	1⅜ cups
200 g	2¼ cups
250 g	2⅚ cups
500 g	5⅝ cups

Other flours & dry bases

See the full CrumbCalc ingredient weight chart →

Frequently Asked Questions

How many grams is 1 cup of old-fashioned rolled oats?

One US cup of old-fashioned rolled oats weighs 89 grams (about 3.14 ounces). This is the King Arthur Baking ingredient weight chart figure, the reference most US test kitchens use.

How many grams is a tablespoon of old-fashioned rolled oats?

A tablespoon of old-fashioned rolled oats is about 5.6 grams, since one cup holds 16 tablespoons. A teaspoon is about 1.9 grams.

How many cups is 250 g of old-fashioned rolled oats?

250 grams of old-fashioned rolled oats is about 2⅚ cups (250 ÷ 89). Weighing is more reliable than measuring by cup.