Baking
Potato Starch Conversion
Potato Starch weighs 152g per US cup.
| Amount | Grams | Ounces |
|---|---|---|
| 1 cup | 152.0 g | 5.36 oz |
| 1/2 cup | 76.0 g | 2.68 oz |
| 1/4 cup | 38.0 g | 1.34 oz |
| 1 tbsp | 9.5 g | 0.34 oz |
| 1 tsp | 3.2 g | 0.11 oz |
| 100 g | 100.0 g | 3.53 oz |
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Potato starch weighs 152 grams per cup, the densest of the pure starches on this site — heavier than cornstarch (120g) despite both being used similarly as thickeners, since potato starch's granules are physically larger and pack differently into a measuring cup.
As a thickener, potato starch performs a lot like cornstarch — it gels when heated in liquid, producing a glossy, translucent finish — but it thickens at a somewhat lower temperature and can lose its thickening power if boiled too vigorously or for too long, a real difference worth knowing if a sauce or gravy needs to hold at a rolling simmer.
Potato starch is also a common ingredient in gluten-free baking blends, where it contributes lightness and moisture retention alongside other gluten-free flours — distinct from potato FLOUR, a different, denser product made from whole dried potatoes rather than just the extracted starch, and one that behaves quite differently in a recipe.
Potato starch's 152g-per-cup weight makes it noticeably heavier than cornstarch (120g/cup) despite both being used similarly as thickeners — potato starch's granules are larger and denser, and it thickens at a lower temperature than cornstarch, which makes it a common substitute in recipes (particularly some gluten-free and Passover baking) where a milder, less starchy aftertaste than cornstarch's is preferred.
Potato starch also breaks down faster under prolonged high heat or vigorous stirring than cornstarch does, which is why it's better suited to sauces finished quickly rather than dishes simmered for a long stretch after thickening.
It's naturally gluten-free, which is exactly why it appears so often in gluten-free flour blends alongside rice flour and tapioca starch.
It's flavorless enough that it doesn't compete with a delicate sauce the way a starch with more of its own taste might.
It's a traditional thickener in many Eastern European soups and stews, valued there for the smooth, glossy finish it gives a broth.
Frequently asked questions
Is potato starch the same as potato flour?
No — potato starch is the pure starch extracted from potatoes, light and neutral, while potato flour is made from whole dried, ground potatoes and is denser, heavier, and carries a more noticeable potato flavor; the two aren't interchangeable.
Can I substitute potato starch for cornstarch 1:1?
Yes, generally — both work as thickeners with a similar glossy result, though potato starch thickens at a slightly lower temperature and loses its thickening power more easily if boiled too long, so a gentler simmer works better with it.
Why does potato starch weigh more per cup than cornstarch?
Its granules are physically larger than cornstarch's, and that difference in granule size and packing is what accounts for potato starch's heavier weight in the same cup volume, even though both are pure, refined starches.
Is potato starch gluten-free?
Yes — as a starch extracted from potatoes with no wheat involved, it's naturally gluten-free and a common component in commercial gluten-free flour blends specifically for the lightness it contributes.
Does potato starch work in a cold application, like a fruit filling that isn't cooked?
Not well — like cornstarch, potato starch needs heat to activate its thickening gel structure, so it won't thicken a cold mixture the way a starch mixed into an already-hot liquid will.