To convert cups of oat flour into grams, multiply by 92: one cup comes to 92 grams. Every ingredient has its own figure here, because the units are measuring different things and only the density links them.
Put next to water — 1 g per mL exactly — oat flour measures 0.38886 g per mL. That ratio, 38.89%, is what separates this page from every other ingredient in the same units, and it is measured rather than defined.
A cup of oat flour is 92 g when it is measured the standard way, but how it gets into the cup changes the answer: between about 82.8 g and 110.4 g covers the range from lightly spooned to firmly packed. That 20% spread is larger than most of the adjustments recipes fuss over, and it disappears entirely the moment the ingredient is weighed instead.
Grams are the unit this conversion is really for. A domestic scale resolves to a gram, which is 1.09% of a cup of oat flour, so weighing gets an accuracy no measuring cup can reach. A 500 g pack of it is 5.435 cups, and a 1 kg pack 10.87.
How the figure is arrived at: Ground rolled oats, and almost as light per cup as the flakes it came from.
The formula
cups- The amount of oat flour you are converting, in cups
92- Grams per cup for oat flour, from its density of 0.38886 g/mL
grams- The equivalent quantity in grams
How it works, step by step
- Enter the quantity in cups.
- It is multiplied by 92, the grams-per-cup figure for oat flour.
- The result appears in grams, with a second reading in oz beneath it.
- Use the measure table if you want a standard recipe quantity rather than a number you type in.
Worked examples
1/3 cup of oat flour in grams
Take 1/3 cup of oat flour: 0.333333 × 92 gives 30.6667 grams. Doubling the batch takes it to 61.3333 grams, because the relationship is a straight proportion once the density is known.
3/4 cup of oat flour in grams
Take 3/4 cup of oat flour: 0.75 × 92 gives 69 grams. Doubling the batch takes it to 138 grams, because the relationship is a straight proportion once the density is known.
3 cup of oat flour in grams
Take 3 cup of oat flour: 3 × 92 gives 276 grams. Doubling the batch takes it to 552 grams, because the relationship is a straight proportion once the density is known.
How to read your score
Frequently asked questions
How many grams are in 1 cup of oat flour?
One cup of oat flour is 92 grams. Half that quantity is 46 grams and double it is 184 grams, so the figure scales straight up and down — there is no offset in this conversion, only the factor.
Why is a cup of oat flour not 236 g like water?
Because weight per cup depends on what is in the cup. Oat flour has a density of 0.38886 g per mL where water has 1.00, so a cup of it weighs 92 g rather than 236.6 g. That is a difference of 144.6 g per cup, and it is the reason a single volume-to-weight factor cannot be applied to every ingredient.
Does how I measure it change the weight?
Yes, and by more than most people expect. Handling changes the weight of a cup of oat flour by roughly 20% — about 9.2 g either side of 92 g — because ground rolled oats, and almost as light per cup as the flakes it came from. Weighing removes the question entirely.
Is a fluid ounce of oat flour the same as an ounce?
No. A fluid ounce is a volume — one eighth of a US cup, 29.57 mL — and an ounce is a weight. One fluid ounce of oat flour weighs 0.4057 oz, so the two readings differ by 59.4%. They coincide only for something with the density of water, and then only roughly.
Is this a US cup or a metric cup?
US customary: 236.59 mL, which is the cup every US recipe means. A metric cup is 250 mL, so the same cup of oat flour would weigh 97.215 g instead of 92 g — 5.22 g more, or 5.67%. Australian and some European recipes use the metric cup, and the difference is large enough to matter in baking.
Do I need a scale for this, or will measuring cups do?
A scale, if the result matters. Volume measuring carries a spread of about 20% for oat flour — roughly 18.4 g on a 92 g cup — while a domestic scale is accurate to a gram or two. For anything where the ratio of ingredients drives the outcome, bread and pastry above all, weigh it.
How many cups of oat flour is 500 g?
500 g of oat flour is 5.4348 cups — 0.0108696 cups to one gram, so 500 × 0.0108696 = 5.4348. Going that way is a division by 92, or a multiplication by 0.0108696 if you prefer.
Oat flour in cups and grams
| Cups | Grams | Unrounded |
|---|---|---|
| 1/8 cup | 11.5 g | 11.5 |
| 1/4 cup | 23 g | 23 |
| 1/3 cup | 30.6667 g | 30.66666667 |
| 1/2 cup | 46 g | 46 |
| 2/3 cup | 61.3333 g | 61.33333333 |
| 3/4 cup | 69 g | 69 |
| 1 cup | 92 g | 92 |
| 1 1/2 cup | 138 g | 138 |
| 2 cup | 184 g | 184 |
| 3 cup | 276 g | 276 |
| 4 cup | 368 g | 368 |
Based on 92 g per cup of oat flour. One cup of oat flour is 92 grams.
| Measure | Grams | Ounces | Millilitres |
|---|---|---|---|
| 1 cup | 92 g | 3.25 oz | 236.6 mL |
| 3/4 cup | 69 g | 2.43 oz | 177.4 mL |
| 2/3 cup | 61.33 g | 2.16 oz | 157.7 mL |
| 1/2 cup | 46 g | 1.62 oz | 118.3 mL |
| 1/3 cup | 30.67 g | 1.08 oz | 78.86 mL |
| 1/4 cup | 23 g | 0.811 oz | 59.15 mL |
| 1 tbsp | 5.75 g | 0.203 oz | 14.79 mL |
| 1 tsp | 1.917 g | 0.0676 oz | 4.929 mL |
US customary measures: 1 cup = 236.59 mL, 1 tbsp = 14.79 mL, 1 tsp = 4.93 mL.
| Ingredient | Grams per cup | Ounces per cup | Density (g/mL) |
|---|---|---|---|
| Panko breadcrumbs | 60 g | 2.116 oz | 0.2536 |
| Cocoa powder | 85 g | 2.998 oz | 0.3593 |
| Rolled oats | 90 g | 3.175 oz | 0.3804 |
| Oat flour (this page) | 92 g | 3.245 oz | 0.3889 |
| Almond flour | 96 g | 3.386 oz | 0.4058 |
| Rye flour | 102 g | 3.598 oz | 0.4311 |
| Dry breadcrumbs | 108 g | 3.81 oz | 0.4565 |
Ordered by weight. The spread across this group is why a single generic cups-to-grams factor cannot work.