What Can I Substitute for Cornstarch? | Practical Swaps That Work

The best cornstarch substitute depends on the job — all-purpose flour, potato starch, arrowroot powder, tapioca starch, and rice flour each handle thickening, frying, and baking differently.

Cornstarch is a pantry workhorse, turning thin sauces into glossy gravies and delivering the crunch that makes fried chicken sing. But when the box is empty or a guest avoids gluten, the right swap keeps the dish on track. The catch: no single substitute does everything cornstarch does, and using the wrong one at the wrong ratio is the fastest way to a broken sauce. Here is exactly what to reach for, and when.

Thickening Sauces, Soups, and Gravies

Cornstarch thickens with a clear, glossy finish that holds well at serving temperature. For stovetop jobs, three replacements work cleanly — but each has a quirk worth knowing.

All-purpose flour is the most common swap. Use 2 tablespoons of flour for every 1 tablespoon of cornstarch. Mix it into a slurry with cold water or make a roux with butter before adding liquid to avoid lumps. Flour gives a matte, opaque finish — less glossy than cornstarch — but holds up to long simmering without breaking down. It is not gluten-free.

Potato starch matches cornstarch at a 1:1 ratio. It thickens rapidly and leaves a clear, smooth texture. The catch: add it at the very end of cooking and do not boil it hard, because the sauce will thin out again. Sauces thickened with potato starch also lose their body when reheated, so serve the dish right away.

Arrowroot powder also works at 1:1. Dissolve it in cold water first, then stir it into a room-temperature sauce. Arrowroot delivers the same glossy look cornstarch is prized for, but the sauce does not hold its thickness after cooling — serve immediately for best results.

Tapioca starch (also called cassava flour) is flavorless, gluten-free, and uses 2 tablespoons per 1 tablespoon of cornstarch. It thickens well at moderate heat, but boiling it destroys the thickening power. Keep the heat medium and pull the pot off before it starts bubbling hard.

Frying and Crispy Coatings

For crunchy crusts on proteins and vegetables, cornstarch creates that delicate, brittle shell. Two substitutes excel here.

Rice flour uses 2 tablespoons per 1 tablespoon of cornstarch. It produces a tender, craggy, crunchy crust that stays crispy after frying. It works for both pan frying and deep frying, though it costs a bit more than cornstarch. Rice flour is also gluten-free.

Potato starch works at 1:1 and is excellent for high-temperature deep frying. It creates an ultra-crispy texture that fries up cleanly. Like the sauce swap above, it does best when added as a dusting just before the oil.

Baking and Gluten-Free Applications

In baking, cornstarch softens flour and adds tenderness. When baking without gluten, its structure-building role shifts — you need ingredients that bind and hold moisture.

Almond flour can replace cornstarch at a 1:1 ratio when you need bulk rather than thickening in baked goods. It adds richness but is not suitable for people with nut allergies.

Xanthan gum is a potent option — use 1/4 teaspoon for every 1 tablespoon of cornstarch. It is critical for gluten-free structure, adding chewiness to doughs and batters. Exceed that tiny amount and the result turns slimy and gummy, so measure with care.

Glucomannan powder needs only 1/4 teaspoon per 2 teaspoons of cornstarch. It is a high-fiber, low-carb choice that works well in gluten-free breads and chewy cookies. Psyllium husk powder uses 1/2 tablespoon per 1 tablespoon of cornstarch and forms a thick gel with water that helps structure breads. Flaxseed meal (ground flaxseeds) works at 1/2 tablespoon per 1 tablespoon of cornstarch; it adds a nutty flavor and binds well in bread recipes. For a gel substitute, mix 1 tablespoon of ground flaxseeds with 4 tablespoons of water and let it sit for five minutes.

Common Mistakes to Skip

Using the wrong ratio is the most frequent error. Flour at 1:1 produces a weak, watery sauce — always double the amount. Reheating sauces thickened with potato starch or arrowroot often leaves them thin, so plan to serve those dishes fresh. Overheating tapioca destroys its thickening power outright, so keep the burner on medium. And while all-purpose flour is fine for most, it is not gluten-free — swap it with rice flour or a gluten-free all-purpose blend for anyone avoiding wheat. Overdoing xanthan gum creates a gummy mess; a light hand is the only safe one.