To convert ounces of rice flour into cups, multiply by 0.17942736: one ounce comes to 0.17942736 cups. Every ingredient has its own figure here, because the units are measuring different things and only the density links them.
Put next to water — 1 g per mL exactly — rice flour measures 0.66783 g per mL. That ratio, 66.78%, is what separates this page from every other ingredient in the same units, and it is measured rather than defined.
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.
What the number depends on: Fine, dense and gluten-free. Common in gluten-free blends and in tempura and rice-noodle batters.
The formula
ounces- The amount of rice flour you are converting, in ounces
0.179427361551- Cups per ounce for rice flour, from its density of 0.66783 g/mL
cups- The equivalent quantity in cups
How it works, step by step
- Enter the quantity in ounces.
- It is multiplied by 0.179427361551, the cups-per-ounce figure for rice flour.
- The result appears in cups, with a second reading in tbsp beneath it.
- Use the measure table if you want a standard recipe quantity rather than a number you type in.
Worked examples
2 oz of rice flour in cups
Take 2 oz of rice flour: 2 × 0.17942736 gives 0.358855 cups. Doubling the batch takes it to 0.717709 cups, because the relationship is a straight proportion once the density is known.
4 oz of rice flour in cups
Take 4 oz of rice flour: 4 × 0.17942736 gives 0.717709 cups. Doubling the batch takes it to 1.43542 cups, because the relationship is a straight proportion once the density is known.
12 oz of rice flour in cups
Take 12 oz of rice flour: 12 × 0.17942736 gives 2.15313 cups. Doubling the batch takes it to 4.30626 cups, because the relationship is a straight proportion once the density is known.
How to read your score
Frequently asked questions
How many cups are in 1 oz of rice flour?
One ounce of rice flour is 0.17942736 cups. Half that quantity is 0.0897137 cups and double it is 0.358855 cups, 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 much does 2 cup of rice flour weigh?
2 cup of rice flour comes to 316 g, or 11.147 ounces. This page runs that calculation in reverse — enter a weight and it returns the volume — and the cups-to-ounces page does it in the direction the question is usually asked.
Rice flour in ounces and cups
| Ounces | Cups | Unrounded |
|---|---|---|
| 1/2 oz | 0.0897137 cup | 0.08971368078 |
| 1 oz | 0.179427 cup | 0.1794273616 |
| 2 oz | 0.358855 cup | 0.3588547231 |
| 3 oz | 0.538282 cup | 0.5382820847 |
| 4 oz | 0.717709 cup | 0.7177094462 |
| 6 oz | 1.07656 cup | 1.076564169 |
| 8 oz | 1.43542 cup | 1.435418892 |
| 12 oz | 2.15313 cup | 2.153128339 |
| 16 oz | 2.87084 cup | 2.870837785 |
Based on 158 g per cup of rice flour. One ounce of rice flour is 0.17942736 cups.
| 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.