Cups to grams: rolled oats

A US cup of rolled oats weighs roughly 90 grams, or 3.17 ounces. Weighing is always more repeatable than scooping, which is why professional recipes give grams.

Amount in US cups

Or a weight to convert back

Weight

90.0g

= Exact rolled oats cups to grams Show in

Weight in ounces: 3.175
Cups in the weight you entered: 1.111
Tablespoons in that weight: 17.78
Tablespoons: 16.00
Teaspoons: 48.0
Volume: 236.6
Grams per cup used: 90.0
Implied bulk density: 0.3804 g/mL

Show the working

Amount in US cups = 1
Or a weight to convert back = 100
Grams per cup used = 90 = 90
Weight = 1 * 90 = 90
Weight in ounces = 90 / 28.349523125 = 3.174 66
Tablespoons = 1 * 16 = 16
Teaspoons = 1 * 48 = 48
Volume = 1 * 236.5882365 = 236.588
Cups in the weight you entered = 90 > 0 ? 100 / 90 : 0 = 1.111 11
Tablespoons in that weight = 1.111 11 * 16 = 17.7778
Implied bulk density = 90 / 236.5882365 = 0.380 408

Values are shown to six significant figures here; the arithmetic itself runs on exact fractions and is only rounded where a number is printed.

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The formula

grams = cups x grams per cup
1 US cup = 16 tablespoons = 48 teaspoons = 236.588 236 5 mL exactly
1 ounce = 28.349 523 125 g exactly

Cup figures assume the spoon-and-level convention: fluff the ingredient, spoon it into the cup and sweep the top flat. Dipping the cup straight into the bag packs in up to 20% more.

The volume conversions on this page are exact by definition. Only the grams-per-cup figure is a measured convention, and it is stated above so you can substitute your own.

Common measures of rolled oats

Measure	Grams	Ounces
1 teaspoon	1.88	0.066
1 tablespoon	5.63	0.198
1/4 cup	22.5	0.79
1/3 cup	30.0	1.06
1/2 cup	45.0	1.59
1 cup	90.0	3.17
2 cups	180.0	6.35

Rounded for the kitchen. The calculator above keeps full precision.

Frequently asked

How many grams are in a cup of rolled oats?

About 90 g, using the spoon-and-level convention for a US cup.

How many grams are in a tablespoon of rolled oats?

About 5.63 g, since a tablespoon is exactly one sixteenth of a US cup.

Is a US cup the same as a metric cup?

No. A US cup is 236.588 mL, a metric cup is 250 mL and an imperial cup is 284.13 mL. A recipe that says "cup" without qualification almost always means the US one.

Where the numbers come from

Volume relationships follow the US customary definitions; the grams-per-cup figure is the widely published spoon-and-level convention for this ingredient.