Grams of oat flour to millilitres runs on one number, 2.5716113 millilitres per gram. It is a measured property of this ingredient rather than a defined conversion, which is why a generic volume-to-weight tool cannot give you it.
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.
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.
How the figure is arrived at: Ground rolled oats, and almost as light per cup as the flakes it came from.
The formula
grams- The amount of oat flour you are converting, in grams
2.5716112663- Millilitres per gram for oat flour, from its density of 0.38886 g/mL
millilitres- The equivalent quantity in millilitres
How it works, step by step
- Enter the quantity in grams.
- It is multiplied by 2.5716112663, the millilitres-per-gram figure for oat flour.
- The result appears in millilitres, with a second reading in tsp beneath it.
- Use the measure table if you want a standard recipe quantity rather than a number you type in.
Worked examples
50 g of oat flour in millilitres
Take 50 g of oat flour: 50 × 2.5716113 gives 128.581 millilitres. Doubling the batch takes it to 257.161 millilitres, because the relationship is a straight proportion once the density is known.
150 g of oat flour in millilitres
A recipe calling for 150 g of oat flour needs 385.742 millilitres on the scale. The arithmetic is 150 × 2.5716113 = 385.74169, and halving the recipe halves the weight to 192.871 millilitres.
500 g of oat flour in millilitres
A recipe calling for 500 g of oat flour needs 1285.81 millilitres on the scale. The arithmetic is 500 × 2.5716113 = 1285.8056, and halving the recipe halves the weight to 642.903 millilitres.
How to read your score
Frequently asked questions
How many millilitres are in 1 g of oat flour?
One gram of oat flour is 2.5716113 millilitres. Half that quantity is 1.28581 millilitres and double it is 5.14322 millilitres, 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 much does 15 mL of oat flour weigh?
15 mL of oat flour comes to 5.8329 g, or 5.8329 grams. This page runs that calculation in reverse — enter a weight and it returns the volume — and the ml-to-grams page does it in the direction the question is usually asked.
Oat flour in grams and millilitres
| Grams | Millilitres | Unrounded |
|---|---|---|
| 5 g | 12.8581 mL | 12.85805633 |
| 10 g | 25.7161 mL | 25.71611266 |
| 25 g | 64.2903 mL | 64.29028166 |
| 50 g | 128.581 mL | 128.5805633 |
| 100 g | 257.161 mL | 257.1611266 |
| 125 g | 321.451 mL | 321.4514083 |
| 150 g | 385.742 mL | 385.7416899 |
| 200 g | 514.322 mL | 514.3222533 |
| 250 g | 642.903 mL | 642.9028166 |
| 300 g | 771.483 mL | 771.4833799 |
| 500 g | 1285.81 mL | 1285.805633 |
| 1000 g | 2571.61 mL | 2571.611266 |
Based on 92 g per cup of oat flour. One gram of oat flour is 2.5716113 millilitres.
| 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.