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Rolled oats: cups to grams

1 cup of rolled oats = 81 grams (2.9 oz). 1 tablespoon = 5.1 g, 1 teaspoon = 1.7 g. Measured: dry, old-fashioned or quick.
Fractions work: 1/3, 1 1/2

Rolled oats cups to grams chart

US cupsGramsOunces
1/8 cup10 g0.36 oz
1/4 cup20 g0.71 oz
1/3 cup27 g0.95 oz
1/2 cup41 g1.4 oz
2/3 cup54 g1.9 oz
3/4 cup61 g2.1 oz
1 cup81 g2.9 oz
1 1/2 cups122 g4.3 oz
2 cups162 g5.7 oz
3 cups243 g8.6 oz
4 cups324 g11.4 oz

Tablespoons and teaspoons

Spoon measureGrams
1 teaspoon1.7 g
2 teaspoons3.4 g
1 tablespoon5.1 g
2 tablespoons10 g
3 tablespoons15 g
4 tablespoons (1/4 cup)20 g

Rolled oats grams to cups

GramsUS cups (decimal)Closest kitchen measure
25 g0.311/4 cup + 1 tbsp
50 g0.621/2 cup + 2 tbsp
100 g1.231 cup + 4 tbsp
125 g1.541 1/2 cups + 0.5 tbsp
150 g1.851 3/4 cups + 1.5 tbsp
200 g2.472 1/3 cups + 2 tbsp
250 g3.093 cups + 1.5 tbsp
300 g3.703 2/3 cups + 0.5 tbsp
400 g4.944 3/4 cups + 3 tbsp
500 g6.176 cups + 3 tbsp
750 g9.269 1/4 cups
1000 g12.3512 1/3 cups

"Closest kitchen measure" rounds down to the nearest standard cup size, then makes up the rest in tablespoons, to the nearest half tablespoon.

Where this number comes from

The weight is taken from the USDA FoodData Central SR Legacy record "Cereals, oats, regular and quick, not fortified, dry" (FDC ID 173904), portion "1 cup" = 81 g. US cups are 236.59 mL. A metric cup (250 mL) holds about 86 g, and a UK imperial cup (284 mL) about 97 g.

Real kitchens vary. Brand, humidity, how finely something is ground and how hard you pack the cup can all move the weight by 5–15%. If a recipe author gives grams, use their number.

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