To convert grams of potato starch into cups, multiply by 0.00625: one gram comes to 0.00625 cups. Every ingredient has its own figure here, because the units are measuring different things and only the density links them.
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 potato starch 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 potato starch 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.
Grams are the unit this conversion is really for. A domestic scale resolves to a gram, which is 0.625% of a cup of potato starch, so weighing gets an accuracy no measuring cup can reach. A 500 g pack of it is 3.125 cups, and a 1 kg pack 6.25.
What the number depends on: Denser than cornstarch, and not the same product as potato flour despite the similar name.
The formula
grams- The amount of potato starch you are converting, in grams
0.00625- Cups per gram for potato starch, from its density of 0.67628 g/mL
cups- The equivalent quantity in cups
How it works, step by step
- Enter the quantity in grams.
- It is multiplied by 0.00625, the cups-per-gram figure for potato starch.
- 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
50 g of potato starch in cups
50 g of potato starch weighs out at 0.3125 cups. Divide 0.3125 by 0.00625 and you get back to 50 g, which is the quickest check that the factor is the right way up.
150 g of potato starch in cups
Take 150 g of potato starch: 150 × 0.00625 gives 0.9375 cups. Doubling the batch takes it to 1.875 cups, because the relationship is a straight proportion once the density is known.
500 g of potato starch in cups
500 g of potato starch weighs out at 3.125 cups. Divide 3.125 by 0.00625 and you get back to 500 g, which is the quickest check that the factor is the right way up.
How to read your score
Frequently asked questions
How many cups are in 1 g of potato starch?
One gram of potato starch is 0.00625 cups. Half that quantity is 0.003125 cups and double it is 0.0125 cups, so the figure scales straight up and down — there is no offset in this conversion, only the factor.
Why is a cup of potato starch not 236 g like water?
Because weight per cup depends on what is in the cup. Potato starch 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 potato starch by roughly 20% — about 16 g either side of 160 g — because denser than cornstarch, and not the same product as potato flour despite the similar name. Weighing removes the question entirely.
Is a fluid ounce of potato starch 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 potato starch 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 potato starch 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 potato starch — 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 much does 2 cup of potato starch weigh?
2 cup of potato starch comes to 320 g, or 320 grams. This page runs that calculation in reverse — enter a weight and it returns the volume — and the cups-to-grams page does it in the direction the question is usually asked.
Potato starch in grams and cups
| Grams | Cups | Unrounded |
|---|---|---|
| 5 g | 0.03125 cup | 0.03125 |
| 10 g | 0.0625 cup | 0.0625 |
| 25 g | 0.15625 cup | 0.15625 |
| 50 g | 0.3125 cup | 0.3125 |
| 100 g | 0.625 cup | 0.625 |
| 125 g | 0.78125 cup | 0.78125 |
| 150 g | 0.9375 cup | 0.9375 |
| 200 g | 1.25 cup | 1.25 |
| 250 g | 1.5625 cup | 1.5625 |
| 300 g | 1.875 cup | 1.875 |
| 500 g | 3.125 cup | 3.125 |
| 1000 g | 6.25 cup | 6.25 |
Based on 160 g per cup of potato starch. One gram of potato starch is 0.00625 cups.
| 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) |
|---|---|---|---|
| Cornmeal | 138 g | 4.868 oz | 0.5833 |
| Graham cracker crumbs | 142 g | 5.009 oz | 0.6002 |
| Rice flour | 158 g | 5.573 oz | 0.6678 |
| Potato starch (this page) | 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 |
| Uncooked quinoa | 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.