Ingredient Weight Converter · flour
Oat Flour: cups to grams
1 cup of oat flour weighs 92 grams. Use the converter below for any other amount, or check the quick-reference table.
By Andrew Flores, Editor and publisher, Nathan Management. Last reviewed .
Density source: USDA FoodData Central, cross-checked against the King Arthur Baking weight chart. How these figures are derived and corrected is documented in our editorial standards.
Oat Flour baseline: 1 cup = 92 g.
Common amounts
| Cups | Tablespoons | Grams | Ounces (weight) | Milliliters |
|---|---|---|---|---|
| 1/4 cup | 4.0 | 23 g | 0.81 oz | 59 mL |
| 1/3 cup | 5.3 | 31 g | 1.08 oz | 79 mL |
| 1/2 cup | 8.0 | 46 g | 1.62 oz | 118 mL |
| 2/3 cup | 10.7 | 61 g | 2.16 oz | 158 mL |
| 3/4 cup | 12.0 | 69 g | 2.43 oz | 177 mL |
| 1 cup | 16.0 | 92 g | 3.25 oz | 237 mL |
| 1.5 cups | 24.0 | 138 g | 4.87 oz | 355 mL |
| 2 cups | 32.0 | 184 g | 6.49 oz | 473 mL |
| 3 cups | 48.0 | 276 g | 9.74 oz | 710 mL |
| 4 cups | 64.0 | 368 g | 12.98 oz | 946 mL |
Spoon weights
Derived from the same 92 g per cup — a US tablespoon is 1/16 of a cup and a teaspoon is 1/48.
| Amount | Grams |
|---|---|
| 1 tablespoon | 5.8 g |
| 1 teaspoon | 1.9 g |
| 1/2 teaspoon | 0.96 g |
| 1/4 teaspoon | 0.48 g |
Oat Flour at a glance
- Gluten
- none; oats are gluten-free but are routinely cross-contaminated in milling — buy certified GF if it matters medically
- Grind-your-own yield
- 1 cup rolled oats (81 g) grinds down to about 7/8 cup oat flour — same weight, tighter packing
- Safe substitution ceiling
- about 1/3 of the wheat flour by weight before the crumb turns crumbly
What a cup of oat flour actually weighs
The published 92 g assumes one specific way of filling the cup. Here is what the same cup weighs under the other common handling methods and product forms, and how far off the recipe you end up.
| How it was measured | Grams per cup | vs. published | Why |
|---|---|---|---|
| Store-bought, spooned and leveled | 92 g | published figure | Commercially milled oat flour is uniform and fine. |
| Home-ground fine in a blender | ~100 g | +9% | A long blend produces smaller particles that pack closer together. Blend in 30-second bursts — over-blending warms the oats and turns them pasty. |
A tilde (~) marks a working estimate rather than a published figure — it varies with brand, grind, or how hard the cup was packed.
Why measuring oat flour by cup goes wrong
Oat flour is rolled oats ground fine. It tastes mildly sweet, has no gluten, and tends to give baked goods a tender, slightly cakey crumb. A cup weighs about 92 grams. If you grind your own from rolled oats, the texture varies based on how long you blend — finer flour packs tighter and weighs a few grams more per cup.
Practical tips for working with oat flour
Substitute up to a third of the wheat flour in a quick bread or pancake recipe with oat flour for added chew and a softer crumb. Going higher than that without adding more egg or a binder produces a crumbly result. Sifted oat flour also makes an excellent gluten-free dredge for fried chicken — it's nuttier than rice flour and crisps faster than cornstarch.
Note from this ingredient's record: Lighter than wheat flour and absorbs liquid differently. Best stored sealed — its high natural oil content turns it rancid faster than wheat flour.
Substitutions that work — and what they cost you
Grind your own from rolled oats
Ratio: 81 g rolled oats yields 81 g oat flour (about 7/8 cup)
Trade-off: Weight is conserved, volume is not — measure by weight or you will be short.
Oat flour into a wheat recipe
Ratio: Replace up to 1/3 of the flour by weight
Trade-off: Softer, moister crumb and a faint sweetness. Past a third, add an extra egg or the result crumbles when cut.
When oat flour ruins the recipe
| What you see | What went wrong | What to do |
|---|---|---|
| Muffins fall apart when you peel the liner | Too much of the wheat flour was replaced, so there is not enough gluten holding the crumb together. | Cap oat flour at a third of the flour weight, or add an egg for binding. |
Storing oat flour
Ground oats expose their oil, so oat flour goes rancid faster than whole rolled oats: about 3 months sealed at room temperature, longer in the freezer.
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