Flours & Starches
Convert cups of oat flour to ounces
One cup of oat flour weighs about 3.1 oz, and half a cup comes to roughly 1.55 oz. Enter any amount below to convert it, or use the chart further down as a quick reference while you cook.
1 cup of oat flour =
3.1 oz
- kg
- 0.088
- lb
- 0.194
Oat Flour: 88 g per US cup · USDA FoodData Central. Home-ground oat flour is fluffier than commercial flour. Weigh it if you blend your own oats.
Full oat flour chart →Oat Flour at a glance
Every number on this page comes from a single figure: 88 grams per US cup (USDA FoodData Central).
- 1 cup
- 88 g
- 1 tablespoon
- 5.5 g
- 1 teaspoon
- 1.83 g
- 1 cup in ounces
- 3.1 oz
- 100 g in cups
- 1.14 cups
- Density
- 0.37 g/ml
cups to ounces chart for oat flour
Print it, screenshot it, or bookmark this page — these are the amounts recipes ask for most often.
| Cups (US) | Grams | Ounces (weight) | Pounds |
|---|---|---|---|
| 1/8 cup | 11 g | 0.388 oz | 0.024 lb |
| 1/4 cup | 22 g | 0.776 oz | 0.049 lb |
| 1/3 cup | 29.3 g | 1.03 oz | 0.065 lb |
| 1/2 cup | 44 g | 1.55 oz | 0.097 lb |
| 2/3 cup | 58.7 g | 2.07 oz | 0.129 lb |
| 3/4 cup | 66 g | 2.33 oz | 0.146 lb |
| 1 cup | 88 g | 3.1 oz | 0.194 lb |
| 1 1/2 cup | 132 g | 4.66 oz | 0.291 lb |
| 2 cup | 176 g | 6.21 oz | 0.388 lb |
| 3 cup | 264 g | 9.31 oz | 0.582 lb |
| 4 cup | 352 g | 12.4 oz | 0.776 lb |
How this conversion is calculated
Volume-to-weight conversions are only as good as the density behind them. We treat oat flour as 88 g per US customary cup, which works out to 0.372 g/ml. From there:
- Your cups figure is converted into millilitres or grams using standard unit sizes (cup = 237 ml).
- The density above bridges volume and weight in whichever direction you need.
- The result is rounded the way a cook would round it — to the nearest gram, or to a usable fraction such as 1 1/8 cups.
Measuring oat flour accurately
Home-ground oat flour is fluffier than commercial flour. Weigh it if you blend your own oats.
If a recipe matters to you — bread, macarons, anything with a tight hydration or ratio — weigh it. A £10 digital scale removes the single largest source of variation in home baking, and it is faster than washing three measuring cups.
When cups are fine
- Liquids measured in a proper jug, where volume is the honest unit anyway.
- Forgiving savoury cooking: soups, stews, stir-fries, marinades.
- Small amounts of leaveners and spices, as long as you use level spoons.
Frequently asked questions
How many ounces are in 1 cup of oat flour?
1 cup of oat flour is 3.1 oz. This is based on a density of 88 g per US cup.
How many ounces are in 2 cups of oat flour?
2 cups of oat flour is 6.21 oz, and 1.55 oz for half a cup.
How much is 100 g of oat flour in cups?
100 g of oat flour is about 1 1/8 cups. Weight is always the more reliable measurement, so use a scale when the recipe gives grams.
Why do other sites give a different number for oat flour?
Home-ground oat flour is fluffier than commercial flour. Weigh it if you blend your own oats.
Do UK and Australian cups give the same result?
No. A US customary cup is 236.6 ml, a metric cup used in Australia and New Zealand is 250 ml, and an old UK imperial cup is 284 ml. Our default is the US cup, but you can pick metric cups in the converter.