Cups of rice flour to grams runs on one number, 158 grams 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.
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.
Grams are the unit this conversion is really for. A domestic scale resolves to a gram, which is 0.633% of a cup of rice flour, so weighing gets an accuracy no measuring cup can reach. A 500 g pack of it is 3.165 cups, and a 1 kg pack 6.329.
The condition this weight assumes: 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
158- Grams per cup for rice flour, from its density of 0.66783 g/mL
grams- The equivalent quantity in grams
How it works, step by step
- Enter the quantity in cups.
- It is multiplied by 158, the grams-per-cup figure for rice 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
1/3 cup of rice flour in grams
1/3 cup of rice flour weighs out at 52.6667 grams. Divide 52.6667 by 158 and you get back to 1/3 cup, which is the quickest check that the factor is the right way up.
3/4 cup of rice flour in grams
A recipe calling for 3/4 cup of rice flour needs 118.5 grams on the scale. The arithmetic is 0.75 × 158 = 118.5, and halving the recipe halves the weight to 59.25 grams.
3 cup of rice flour in grams
3 cup of rice flour weighs out at 474 grams. Divide 474 by 158 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 grams are in 1 cup of rice flour?
One cup of rice flour is 158 grams. Half that quantity is 79 grams and double it is 316 grams, 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 500 g?
500 g of rice flour is 3.1646 cups — 0.00632911 cups to one gram, so 500 × 0.00632911 = 3.1646. Going that way is a division by 158, or a multiplication by 0.00632911 if you prefer.
Rice flour in cups and grams
| Cups | Grams | Unrounded |
|---|---|---|
| 1/8 cup | 19.75 g | 19.75 |
| 1/4 cup | 39.5 g | 39.5 |
| 1/3 cup | 52.6667 g | 52.66666667 |
| 1/2 cup | 79 g | 79 |
| 2/3 cup | 105.333 g | 105.3333333 |
| 3/4 cup | 118.5 g | 118.5 |
| 1 cup | 158 g | 158 |
| 1 1/2 cup | 237 g | 237 |
| 2 cup | 316 g | 316 |
| 3 cup | 474 g | 474 |
| 4 cup | 632 g | 632 |
Based on 158 g per cup of rice flour. One cup of rice flour is 158 grams.
| 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.