One millilitre of oat flour is 0.38886126 grams, so converting millilitres of oat flour to grams means multiplying by 0.38886126. That factor is specific to this ingredient — it comes from its density, not from any relationship between the two units.
The density behind that figure is 0.38886 g per mL, against 1.00 for water. A cup of water weighs 236.6 g and a cup of oat flour weighs 92 g, so this ingredient is 38.89% as heavy as the same volume of water — the single fact the whole page rests on.
Oat flour has a density of 0.38886 g per mL, so 100 mL of it weighs 38.89 g and 250 mL weighs 97.22 g. That single figure is what every other number on this page is built from — water is 1.00 g per mL, so this ingredient is 38.89% as heavy as the same volume of water.
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.
What the number depends on: Ground rolled oats, and almost as light per cup as the flakes it came from.
The formula
millilitres- The amount of oat flour you are converting, in millilitres
0.388861261071- Grams per millilitre 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 millilitres.
- It is multiplied by 0.388861261071, the grams-per-millilitre 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
15 mL of oat flour in grams
A recipe calling for 15 mL of oat flour needs 5.83292 grams on the scale. The arithmetic is 15 × 0.38886126 = 5.8329189, and halving the recipe halves the weight to 2.91646 grams.
100 mL of oat flour in grams
Take 100 mL of oat flour: 100 × 0.38886126 gives 38.8861 grams. Doubling the batch takes it to 77.7723 grams, because the relationship is a straight proportion once the density is known.
250 mL of oat flour in grams
250 mL of oat flour weighs out at 97.2153 grams. Divide 97.2153 by 0.38886126 and you get back to 250 mL, which is the quickest check that the factor is the right way up.
How to read your score
Frequently asked questions
How many grams are in 1 mL of oat flour?
One millilitre of oat flour is 0.38886126 grams. Half that quantity is 0.194431 grams and double it is 0.777723 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?
At this size the spoon wins. One millilitre of oat flour is 0.3889 g, and a scale reading to the nearest gram is working at 257% resolution on that — a measuring spoon is the more accurate instrument below about 5 g, which is why spice quantities are still written in spoons.
How many millilitres of oat flour is 500 g?
500 g of oat flour is 1285.8 millilitres — 2.57161 millilitres to one gram, so 500 × 2.57161 = 1285.8. Going that way is a division by 0.388861, or a multiplication by 2.57161 if you prefer.
Oat flour in millilitres and grams
| Millilitres | Grams | Unrounded |
|---|---|---|
| 5 mL | 1.94431 g | 1.944306305 |
| 10 mL | 3.88861 g | 3.888612611 |
| 15 mL | 5.83292 g | 5.832918916 |
| 30 mL | 11.6658 g | 11.66583783 |
| 50 mL | 19.4431 g | 19.44306305 |
| 100 mL | 38.8861 g | 38.88612611 |
| 125 mL | 48.6077 g | 48.60765763 |
| 150 mL | 58.3292 g | 58.32918916 |
| 200 mL | 77.7723 g | 77.77225221 |
| 250 mL | 97.2153 g | 97.21531527 |
| 500 mL | 194.431 g | 194.4306305 |
Based on 92 g per cup of oat flour. One millilitre of oat flour is 0.38886126 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.