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Oat flour — Cups to Grams

One US cup of oat flour weighs about 92 grams. That makes it lighter than all-purpose flour, which is 120 grams per cup. Oat flour is light and fluffy — you can make your own by blending rolled oats to a powder. Use the converter below to switch oat flour between cups, grams, ounces, tablespoons and millilitres — or read the full chart underneath.

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Oat flour conversion chart

Oat flour — cups to grams chart
Cups	Grams	Ounces	Tablespoons	Millilitres
⅛ cup	11.5 g	0.406 oz	2	29.57 ml
¼ cup	23 g	0.811 oz	4	59.15 ml
⅓ cup	30.67 g	1.08 oz	5.33	78.86 ml
½ cup	46 g	1.62 oz	8	118.3 ml
⅔ cup	61.33 g	2.16 oz	10.67	157.7 ml
¾ cup	69 g	2.43 oz	12	177.4 ml
1 cup	92 g	3.25 oz	16	236.6 ml
1¼ cups	115 g	4.06 oz	20	295.7 ml
1½ cups	138 g	4.87 oz	24	354.9 ml
2 cups	184 g	6.49 oz	32	473.2 ml
3 cups	276 g	9.74 oz	48	709.8 ml

Grams to cups: oat flour

Oat flour — grams to cups chart
Grams	Cups	Ounces	Tablespoons
10 g	0.109	0.353 oz	1.74
25 g	0.272	0.882 oz	4.35
50 g	0.543	1.76 oz	8.7
75 g	0.815	2.65 oz	13.04
100 g	1.09	3.53 oz	17.39
125 g	1.36	4.41 oz	21.74
150 g	1.63	5.29 oz	26.09
200 g	2.17	7.05 oz	34.78
250 g	2.72	8.82 oz	43.48
300 g	3.26	10.58 oz	52.17
400 g	4.35	14.11 oz	69.56
500 g	5.43	17.64 oz	86.96

How to measure oat flour

Oat flour is light and fluffy — you can make your own by blending rolled oats to a powder.

Because a cup measures volume rather than weight, the most reliable way to measure oat flour 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 oat flour

1 cup oat flour = 1¼ cups rolled oats blitzed in a food processor or blender
Pulse 30–60 seconds until powdery. Sift to remove larger flakes if texture matters.

See all oat flour substitutes, ratios and sources →

Oat flour conversions: FAQ

Why doesn't a cup of oat flour weigh the same as a cup of water?

A cup measures volume, not weight. Oat flour is less dense than water (92 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 oat flour conversions

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

100 g to cups

100 g oat flour ≈ 1.09 cups

200 g to cups

200 g oat flour ≈ 2.17 cups

250 g to cups

250 g oat flour ≈ 2.72 cups

500 g to cups

500 g oat flour ≈ 5.43 cups

¼ cup to grams

¼ cup oat flour ≈ 23 g

½ cup to grams

½ cup oat flour ≈ 46 g

1 cup to grams

1 cup oat flour ≈ 92 g

2 cups to grams

2 cups oat flour ≈ 184 g

Related converters

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* 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.