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Rolled oats — Cups to Grams

One US cup of rolled oats weighs about 90 grams. That makes it lighter than all-purpose flour, which is 120 grams per cup. Rolled oats are flaky and light — never press them down into the cup. Use the converter below to switch rolled oats between cups, grams, ounces, tablespoons and millilitres — or read the full chart underneath.

Also known as old-fashioned oats, porridge oats or oatmeal.

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Rolled oats conversion chart

Rolled oats — cups to grams chart
Cups	Grams	Ounces	Tablespoons	Millilitres
⅛ cup	11.25 g	0.397 oz	2	29.57 ml
¼ cup	22.5 g	0.794 oz	4	59.15 ml
⅓ cup	30 g	1.06 oz	5.33	78.86 ml
½ cup	45 g	1.59 oz	8	118.3 ml
⅔ cup	60 g	2.12 oz	10.67	157.7 ml
¾ cup	67.5 g	2.38 oz	12	177.4 ml
1 cup	90 g	3.17 oz	16	236.6 ml
1¼ cups	112.5 g	3.97 oz	20	295.7 ml
1½ cups	135 g	4.76 oz	24	354.9 ml
2 cups	180 g	6.35 oz	32	473.2 ml
3 cups	270 g	9.52 oz	48	709.8 ml

Grams to cups: rolled oats

Rolled oats — grams to cups chart
Grams	Cups	Ounces	Tablespoons
10 g	0.111	0.353 oz	1.78
25 g	0.278	0.882 oz	4.44
50 g	0.556	1.76 oz	8.89
75 g	0.833	2.65 oz	13.33
100 g	1.11	3.53 oz	17.78
125 g	1.39	4.41 oz	22.22
150 g	1.67	5.29 oz	26.67
200 g	2.22	7.05 oz	35.56
250 g	2.78	8.82 oz	44.44
300 g	3.33	10.58 oz	53.33
400 g	4.44	14.11 oz	71.11
500 g	5.56	17.64 oz	88.89

How to measure rolled oats

Rolled oats are flaky and light — never press them down into the cup.

Because a cup measures volume rather than weight, the most reliable way to measure rolled oats is with a digital kitchen scale. If you are working from cups, keep your technique consistent every time so your results are repeatable. For more, see our guide on baking by weight versus volume.

No scale yet? You don't need a fancy one; any digital kitchen scale that reads in 1-gram steps does everything on this site. Well-rated kitchen scales on Amazon →

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Substitutes for rolled oats

Equal quick oats by volume (cookies, muffins, quick breads) (King Arthur Baking)
Quick oats yield a finer, less chewy crumb; rolled oats are larger and chewier. Not interchangeable with steel-cut oats, which won't soften in baking time.

See all rolled oats substitutes, ratios and sources →

Compare rolled oats

Quick oats vs Rolled oats

Rolled oats conversions: FAQ

Why doesn't a cup of rolled oats weigh the same as a cup of water?

A cup measures volume, not weight. Rolled oats is less dense than water (90 g versus 237 g per cup), so the same volume has a different weight. Weighing in grams is the most accurate way to measure it.

Common rolled oats conversions

Quick-answer pages for the conversions people search for most.

100 g to cups

100 g rolled oats ≈ 1.11 cups

200 g to cups

200 g rolled oats ≈ 2.22 cups

250 g to cups

250 g rolled oats ≈ 2.78 cups

500 g to cups

500 g rolled oats ≈ 5.56 cups

¼ cup to grams

¼ cup rolled oats ≈ 22.5 g

½ cup to grams

½ cup rolled oats ≈ 45 g

1 cup to grams

1 cup rolled oats ≈ 90 g

2 cups to grams

2 cups rolled oats ≈ 180 g

Related converters

← All ingredient converters Cups to grams chart Recipe scaler

* Conversion figures are typical average weights for one US customary cup (236.6 ml), based on the King Arthur Baking Ingredient Weight Chart and cross-referenced with the U.S. Department of Agriculture FoodData Central database. Actual weight varies with packing, brand and humidity — see our methodology.