Substitute for cornstarch in frying
Quick answer
Rice flour is the closest match for frying: use it 1:1 for cornstarch. It produces a comparably light, shatteringly crisp crust that holds up well. If you only have all-purpose flour, use 2 tablespoons all-purpose flour for every 1 tablespoon cornstarch, but expect a thicker, slightly chewier result.
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| Rank | Substitute | Ratio (replaces 1 cup cornstarch) | Notes |
|---|---|---|---|
| #1 | Rice flour | 1:1 by weight or volume (e.g., 2 tbsp rice flour for 2 tbsp cornstarch) | Rice flour has very low protein and almost no gluten, which is why it produces a thin, crisp crust nearly indistinguishable from cornstarch in most frying applications. It's the standard substitute used in Korean and Japanese fried chicken recipes and is widely endorsed for this purpose. Works well in both dry dredges and wet batters. Fine or superfine rice flour gives the best texture; coarse-ground rice flour can leave a gritty coating. |
| #2 | Potato starch | 1:1 by weight or volume (e.g., 2 tbsp potato starch for 2 tbsp cornstarch) | Potato starch produces an extremely crisp, delicate crust — some cooks consider it even crispier than cornstarch. It's the preferred starch in many Korean fried chicken recipes. One practical difference: potato starch coating can go slightly gummy faster once the food is out of the oil, so serve quickly. Works well in dry dredges; less common in wet batters. |
| #3 | All-purpose flour | 2 tbsp all-purpose flour for every 1 tbsp cornstarch | All-purpose flour works in a pinch but produces a noticeably different result — the gluten network creates a thicker, breadier crust that absorbs more oil and softens faster. Acceptable for pan-frying or when a heartier coating is fine (e.g., fried chicken with a thicker crust), but it won't replicate cornstarch's characteristic lightness. Not recommended if the recipe specifically calls for a thin, crisp coating. |
| #4 | Arrowroot powder | 1:1 by weight or volume (e.g., 2 tbsp arrowroot for 2 tbsp cornstarch) | Arrowroot behaves similarly to cornstarch and produces a crisp, light crust. The practical downside for frying is that it's more expensive than both cornstarch and rice flour, and it can turn slightly slimy if the coating sits in oil too long at lower temperatures. Keep oil at the correct frying temperature (350–375°F / 175–190°C) and it performs well. Less commonly tested in published frying recipes than rice flour or potato starch, so treat as a solid but secondary option. |
Why frying is different
In frying, cornstarch's role is structural, not flavor-based. It creates a thin starch coating around the food that gelatinizes quickly on contact with hot oil, then dehydrates into a rigid, glassy crust. The low moisture absorption and absence of gluten are what produce that shatteringly crisp texture — properties that all-purpose flour, with its protein and gluten, can only partially replicate. Getting this wrong means a crust that's thick, greasy, or soft within minutes of leaving the fryer.
Common mistakes
The most common error is substituting all-purpose flour at a 1:1 ratio — because flour is much less dense and absorbs far more oil, the crust ends up heavy and greasy. A second frequent mistake is using a coarse-ground starch or flour, which creates a gritty rather than smooth coating. Finally, some cooks use arrowroot or potato starch at too low an oil temperature; both are more sensitive to temperature drops than cornstarch, which causes the coating to absorb oil rather than crisp.
Cornstarch’s value in frying comes down to two properties: it contains no gluten, and it gelatinizes and dehydrates into a rigid coating very quickly in hot oil. Any substitute needs to approximate at least one of those properties to produce a comparable result. Rice flour and potato starch both succeed because they share cornstarch’s low-protein, low-gluten profile — which is why they’re the options you’ll see recommended consistently across Serious Eats, King Arthur Baking, and America’s Test Kitchen rather than whatever happens to be on hand.
All-purpose flour is included here because it’s what most people actually reach for first, and it’s worth being direct: it works, but the gap in texture is real and noticeable. If crispness matters to the dish — fried chicken, karaage, Korean-style double-fried wings, crispy tofu — it’s worth having rice flour or potato starch in the pantry specifically for this purpose.
Frequently asked questions
- Can I use baking powder instead of cornstarch for frying?
- Baking powder is sometimes added to frying batters (roughly 1 tsp per cup of flour) to increase lightness via gas bubbles, but it's not a direct 1:1 cornstarch substitute in a dredge. If you have no starch at all, a small amount of baking powder mixed into all-purpose flour improves crispness somewhat, but the result is still closer to a fluffy tempura than a thin cornstarch crust.
- Does it matter whether I use a wet batter or a dry dredge when choosing a substitute?
- Yes. Rice flour and potato starch work well in both wet batters and dry dredges. Arrowroot is better suited to dry dredges — in wet batters it can become gummy if the batter sits too long before frying. All-purpose flour is the most forgiving in wet batters but produces the softest final crust.
- Will tapioca starch work as a cornstarch substitute for frying?
- Tapioca starch can work at a 1:1 ratio, but it produces a chewier, slightly gummy crust rather than a crisp one. It's occasionally used in Southeast Asian fried dishes deliberately for that texture, but if you want the same result as cornstarch, rice flour or potato starch are more reliable choices.
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