Cups of rice flour to ounces runs on one number, 5.573286 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.
Water is the yardstick: 1 mL of it weighs 1 g. Rice flour comes in at 0.66783 g per mL, or 66.78% of water, which is why a cup of it is 158 g rather than 236.6 g. Volume and weight only line up for water, and only in metric.
A cup of rice flour is 158 g when it is measured the standard way, but how it gets into the cup changes the answer: between about 142.2 g and 189.6 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 rice flour is 5.573 oz. US kitchen scales usually step in eighths of an ounce, which is 3.54 g — around 2.24% 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.
How the figure is arrived at: Fine, dense and gluten-free. Common in gluten-free blends and in tempura and rice-noodle batters.
The formula
cups- The amount of rice flour you are converting, in cups
5.57328598803- Ounces per cup for rice flour, from its density of 0.66783 g/mL
ounces- The equivalent quantity in ounces
How it works, step by step
- Enter the quantity in cups.
- It is multiplied by 5.57328598803, the ounces-per-cup figure for rice flour.
- 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 rice flour in ounces
Take 1/3 cup of rice flour: 0.333333 × 5.573286 gives 1.85776 ounces. Doubling the batch takes it to 3.71552 ounces, because the relationship is a straight proportion once the density is known.
3/4 cup of rice flour in ounces
3/4 cup of rice flour weighs out at 4.17996 ounces. Divide 4.17996 by 5.573286 and you get back to 3/4 cup, which is the quickest check that the factor is the right way up.
3 cup of rice flour in ounces
A recipe calling for 3 cup of rice flour needs 16.7199 ounces on the scale. The arithmetic is 3 × 5.573286 = 16.719858, and halving the recipe halves the weight to 8.35993 ounces.
How to read your score
Frequently asked questions
How many ounces are in 1 cup of rice flour?
One cup of rice flour is 5.573286 ounces. Half that quantity is 2.78664 ounces and double it is 11.1466 ounces, so the figure scales straight up and down — there is no offset in this conversion, only the factor.
Why is a cup of rice flour not 236 g like water?
Because weight per cup depends on what is in the cup. Rice flour has a density of 0.66783 g per mL where water has 1.00, so a cup of it weighs 158 g rather than 236.6 g. That is a difference of 78.6 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 rice flour by roughly 20% — about 15.8 g either side of 158 g — because fine, dense and gluten-free. Weighing removes the question entirely.
Is a fluid ounce of rice 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 rice flour weighs 0.6967 oz, so the two readings differ by 30.3%. 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 rice flour would weigh 166.96 g instead of 158 g — 8.96 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 rice flour — roughly 31.6 g on a 158 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 rice flour is 16 oz?
16 oz of rice flour is 2.8708 cups — 0.179427 cups to one ounce, so 16 × 0.179427 = 2.8708. Going that way is a division by 5.57329, or a multiplication by 0.179427 if you prefer.
Rice flour in cups and ounces
| Cups | Ounces | Unrounded |
|---|---|---|
| 1/8 cup | 0.696661 oz | 0.6966607485 |
| 1/4 cup | 1.39332 oz | 1.393321497 |
| 1/3 cup | 1.85776 oz | 1.857761996 |
| 1/2 cup | 2.78664 oz | 2.786642994 |
| 2/3 cup | 3.71552 oz | 3.715523992 |
| 3/4 cup | 4.17996 oz | 4.179964491 |
| 1 cup | 5.57329 oz | 5.573285988 |
| 1 1/2 cup | 8.35993 oz | 8.359928982 |
| 2 cup | 11.1466 oz | 11.14657198 |
| 3 cup | 16.7199 oz | 16.71985796 |
| 4 cup | 22.2931 oz | 22.29314395 |
Based on 158 g per cup of rice flour. One cup of rice flour is 5.573286 ounces.
| Measure | Grams | Ounces | Millilitres |
|---|---|---|---|
| 1 cup | 158 g | 5.57 oz | 236.6 mL |
| 3/4 cup | 118.5 g | 4.18 oz | 177.4 mL |
| 2/3 cup | 105.3 g | 3.72 oz | 157.7 mL |
| 1/2 cup | 79 g | 2.79 oz | 118.3 mL |
| 1/3 cup | 52.67 g | 1.86 oz | 78.86 mL |
| 1/4 cup | 39.5 g | 1.39 oz | 59.15 mL |
| 1 tbsp | 9.875 g | 0.348 oz | 14.79 mL |
| 1 tsp | 3.292 g | 0.116 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) |
|---|---|---|---|
| Cornstarch | 128 g | 4.515 oz | 0.541 |
| Cornmeal | 138 g | 4.868 oz | 0.5833 |
| Graham cracker crumbs | 142 g | 5.009 oz | 0.6002 |
| Rice flour (this page) | 158 g | 5.573 oz | 0.6678 |
| Potato starch | 160 g | 5.644 oz | 0.6763 |
| Steel-cut oats | 160 g | 5.644 oz | 0.6763 |
| Semolina | 167 g | 5.891 oz | 0.7059 |
Ordered by weight. The spread across this group is why a single generic cups-to-grams factor cannot work.