Cups of steel-cut oats to ounces runs on one number, 5.6438339 ounces per cup. 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.
The density behind that figure is 0.67628 g per mL, against 1.00 for water. A cup of water weighs 236.6 g and a cup of steel-cut oats weighs 160 g, so this ingredient is 67.63% as heavy as the same volume of water — the single fact the whole page rests on.
A cup of steel-cut oats is 160 g when it is measured the standard way, but how it gets into the cup changes the answer: between about 144 g and 192 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.
One cup of steel-cut oats is 5.644 oz. US kitchen scales usually step in eighths of an ounce, which is 3.54 g — around 2.21% of a cup of this ingredient, so the scale is precise enough for a full cup and coarse for a spoonful. That is why recipes mix the two systems: ounces for the bulk, spoons for the small amounts.
The condition this weight assumes: Cut rather than rolled, so the pieces are dense and pack far tighter than flakes of the same grain.
The formula
cups- The amount of steel-cut oats you are converting, in cups
5.64383391193- Ounces per cup for steel-cut oats, from its density of 0.67628 g/mL
ounces- The equivalent quantity in ounces
How it works, step by step
- Enter the quantity in cups.
- It is multiplied by 5.64383391193, the ounces-per-cup figure for steel-cut oats.
- The result appears in ounces, with a second reading in g 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 steel-cut oats in ounces
Take 1/3 cup of steel-cut oats: 0.333333 × 5.6438339 gives 1.88128 ounces. Doubling the batch takes it to 3.76256 ounces, because the relationship is a straight proportion once the density is known.
3/4 cup of steel-cut oats in ounces
Take 3/4 cup of steel-cut oats: 0.75 × 5.6438339 gives 4.23288 ounces. Doubling the batch takes it to 8.46575 ounces, because the relationship is a straight proportion once the density is known.
3 cup of steel-cut oats in ounces
3 cup of steel-cut oats weighs out at 16.9315 ounces. Divide 16.9315 by 5.6438339 and you get back to 3 cup, which is the quickest check that the factor is the right way up.
How to read your score
Frequently asked questions
How many ounces are in 1 cup of steel-cut oats?
One cup of steel-cut oats is 5.6438339 ounces. Half that quantity is 2.82192 ounces and double it is 11.2877 ounces, so the figure scales straight up and down — there is no offset in this conversion, only the factor.
Why is a cup of steel-cut oats not 236 g like water?
Because weight per cup depends on what is in the cup. Steel-cut oats has a density of 0.67628 g per mL where water has 1.00, so a cup of it weighs 160 g rather than 236.6 g. That is a difference of 76.6 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 steel-cut oats by roughly 20% — about 16 g either side of 160 g — because cut rather than rolled, so the pieces are dense and pack far tighter than flakes of the same grain. Weighing removes the question entirely.
Is a fluid ounce of steel-cut oats 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 steel-cut oats weighs 0.7055 oz, so the two readings differ by 29.5%. 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 steel-cut oats would weigh 169.07 g instead of 160 g — 9.07 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 steel-cut oats — roughly 32 g on a 160 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 steel-cut oats is 16 oz?
16 oz of steel-cut oats is 2.835 cups — 0.177185 cups to one ounce, so 16 × 0.177185 = 2.835. Going that way is a division by 5.64383, or a multiplication by 0.177185 if you prefer.
Steel-cut oats in cups and ounces
| Cups | Ounces | Unrounded |
|---|---|---|
| 1/8 cup | 0.705479 oz | 0.705479239 |
| 1/4 cup | 1.41096 oz | 1.410958478 |
| 1/3 cup | 1.88128 oz | 1.881277971 |
| 1/2 cup | 2.82192 oz | 2.821916956 |
| 2/3 cup | 3.76256 oz | 3.762555941 |
| 3/4 cup | 4.23288 oz | 4.232875434 |
| 1 cup | 5.64383 oz | 5.643833912 |
| 1 1/2 cup | 8.46575 oz | 8.465750868 |
| 2 cup | 11.2877 oz | 11.28766782 |
| 3 cup | 16.9315 oz | 16.93150174 |
| 4 cup | 22.5753 oz | 22.57533565 |
Based on 160 g per cup of steel-cut oats. One cup of steel-cut oats is 5.6438339 ounces.
| Measure | Grams | Ounces | Millilitres |
|---|---|---|---|
| 1 cup | 160 g | 5.64 oz | 236.6 mL |
| 3/4 cup | 120 g | 4.23 oz | 177.4 mL |
| 2/3 cup | 106.7 g | 3.76 oz | 157.7 mL |
| 1/2 cup | 80 g | 2.82 oz | 118.3 mL |
| 1/3 cup | 53.33 g | 1.88 oz | 78.86 mL |
| 1/4 cup | 40 g | 1.41 oz | 59.15 mL |
| 1 tbsp | 10 g | 0.353 oz | 14.79 mL |
| 1 tsp | 3.333 g | 0.118 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) |
|---|---|---|---|
| Graham cracker crumbs | 142 g | 5.009 oz | 0.6002 |
| Rice flour | 158 g | 5.573 oz | 0.6678 |
| Potato starch | 160 g | 5.644 oz | 0.6763 |
| Steel-cut oats (this page) | 160 g | 5.644 oz | 0.6763 |
| Semolina | 167 g | 5.891 oz | 0.7059 |
| Uncooked quinoa | 170 g | 5.997 oz | 0.7185 |
| Dry couscous | 170 g | 5.997 oz | 0.7185 |
Ordered by weight. The spread across this group is why a single generic cups-to-grams factor cannot work.