The best cornstarch replacements depend on what you're making

Cornstarch thickens sauces, gravies, and pie fillings by absorbing liquid and turning it into a gel. If you don't have cornstarch on hand, potato starch, arrowroot powder, and tapioca starch work almost identically — they thicken at similar temperatures and won't change the flavor of your dish. For baking, the choice matters more because cornstarch affects texture differently than flour does, so your substitute depends on whether you need the same crumb structure or just a thickening agent.

The swap usually works 1-to-1, meaning you use the same amount of replacement as you would cornstarch. The main difference is how quickly each one thickens and whether it holds up to reheating or freezing. Some replacements work better in cold dishes, others in hot ones, and a few change the final texture enough that you'll notice the difference.

Key Takeaways

  • Potato starch, arrowroot powder, and tapioca starch thicken sauces and gravies the same way cornstarch does and can be swapped 1-to-1 in most recipes.
  • Flour thickens more slowly than cornstarch and requires about twice as much, but works in gravies and sauces that will be cooked for several minutes.
  • For baking, cake flour or all-purpose flour mixed with arrowroot creates a lighter crumb similar to what cornstarch produces.
  • Xanthan gum thickens without heat and works well in cold sauces, salad dressings, and gravies that won't be reheated.
  • Some replacements break down if frozen or reheated, so check whether your dish needs to hold up to those conditions.

Potato starch for sauces, gravies, and pie fillings

Potato starch is the closest match to cornstarch in how it behaves. It thickens at roughly the same temperature, produces a clear gel, and doesn't add flavor. You can use it 1-to-1 in any recipe where cornstarch is the thickening agent — gravies, pan sauces, fruit pie fillings, and Asian stir-fry sauces all work well.

The main drawback is that potato starch breaks down if you freeze the finished dish or reheat it multiple times. If you're making something you plan to freeze, use arrowroot or tapioca starch instead. Potato starch also separates slightly if a sauce sits for hours, so stir before serving.

Arrowroot powder for dishes that will be frozen or reheated

Arrowroot powder thickens at a slightly lower temperature than cornstarch, so it works faster in cold or warm liquids. It produces a clear, glossy gel and holds up better to freezing and reheating than potato starch does. Use it 1-to-1 as a cornstarch replacement in gravies, sauces, and pie fillings.

Arrowroot has a mild taste and won't cloud clear sauces. It's also easier to find in stores than potato starch and works in recipes for people avoiding corn or potatoes. The one limitation is that arrowroot can become slimy if you cook it too long or at very high heat, so add it near the end of cooking and avoid boiling hard.

Tapioca starch for thick, glossy fillings

Tapioca starch creates a thicker, glossier gel than cornstarch and works especially well in fruit pie fillings and puddings. It's also stable when frozen and reheated, making it a good choice for dishes you plan to store. Use it 1-to-1 in place of cornstarch.

Tapioca starch can leave small, slightly grainy particles visible in the finished dish if you don't cook it long enough or if you don't mix it well with cold liquid first. Make a slurry by mixing tapioca starch with a small amount of cold water before adding it to hot liquid — this prevents lumps. The texture is noticeably thicker than cornstarch, so reduce the amount slightly if you want a thinner sauce.

Flour for gravies and sauces that cook for several minutes

All-purpose flour thickens sauces and gravies but requires roughly twice as much as cornstarch — if a recipe calls for 1 tablespoon of cornstarch, use 2 tablespoons of flour. Flour also thickens more slowly, so you need to cook the mixture for at least 1 to 2 minutes after adding it to let the starch granules swell and thicken the liquid.

Flour produces a cloudier, less glossy result than cornstarch, so it's better suited to gravies and cream sauces where clarity doesn't matter. It won't work well in fruit pie fillings or clear Asian sauces where you want the filling to shine through. Flour also doesn't hold up as well to freezing, and the sauce may separate when thawed.

Xanthan gum for cold sauces and dressings

Xanthan gum is a thickener that works without heat, making it useful for salad dressings, cold sauces, and gravies that won't be cooked. It thickens when ready and creates a smooth, creamy texture. Use much less than you would cornstarch — start with 1/4 teaspoon per cup of liquid and add more if needed, since too much xanthan gum makes the sauce slimy.

Xanthan gum doesn't dissolve the way cornstarch does, so you need to blend it thoroughly with a whisk or immersion blender to avoid lumps. It works well in vinaigrettes, mayonnaise-based dressings, and cold gravies. It's not ideal for hot sauces that will be reheated repeatedly, as the texture can break down.

Cake flour or arrowroot for baking cakes and cookies

In baking, cornstarch is often mixed with flour to create a lighter, more tender crumb — it weakens the gluten network so the cake stays soft. If you're out of cornstarch, you can replace it with cake flour, which is already lower in protein and produces a similar tender texture. Use the same amount of cake flour as the recipe calls for cornstarch.

Alternatively, mix all-purpose flour with arrowroot powder in a 1-to-1 ratio and use that blend as your cornstarch replacement. This mimics what cornstarch does in the recipe without requiring a specialty ingredient. If the recipe calls for 2 tablespoons of cornstarch, mix 1 tablespoon of all-purpose flour with 1 tablespoon of arrowroot and use that blend.

Frequently Asked Questions

Can I use regular flour instead of cornstarch in a pie filling?

Yes, but the filling will be cloudier and slightly less glossy. Use twice as much flour as the recipe calls for cornstarch, and cook the filling for at least 1 to 2 minutes after adding the flour to let it thicken fully. The texture will be slightly grainier than with cornstarch.

What's the difference between cornstarch and tapioca starch?

Tapioca starch creates a thicker, glossier gel and holds up better to freezing. Cornstarch produces a clearer result and thickens slightly faster. Both work 1-to-1 in most recipes, but tapioca may make the finished dish noticeably thicker, so reduce the amount slightly if you prefer a thinner sauce.

Does arrowroot work the same as cornstarch in gravy?

Yes, arrowroot works 1-to-1 in gravy and produces a similar clear, glossy result. It thickens slightly faster than cornstarch and holds up better to freezing and reheating, making it a good choice if you're storing the gravy.

Can I use xanthan gum in hot sauces?

Xanthan gum works in hot sauces but is better suited to cold ones since it thickens without heat. In hot sauces, use a small amount — start with 1/4 teaspoon per cup — and blend it in thoroughly to avoid lumps. It won't break down from heat, but the texture may change if you reheat the sauce multiple times.

What happens if I use too much replacement thickener?

Too much thickener makes the sauce or filling gelatinous and unpleasant to eat. Start with the amount the recipe calls for, then add more if needed. With xanthan gum especially, a little goes a long way — too much creates a slimy texture that's hard to fix.