Cornstarch is the closest substitute for potato starch in most recipes
Cornstarch works as a one-to-one replacement for potato starch in almost every cooking and baking situation. Both are starches that thicken liquids the same way, produce similar texture in baked goods, and have nearly identical flavor (which is to say, almost none). You can swap them in equal amounts without adjusting anything else in the recipe.
The main difference is that cornstarch thickens slightly faster and produces a glossier finish in sauces and gravies. Potato starch creates a softer, more delicate crumb in cakes and pastries. For everyday cooking—thickening soups, making gravy, or dusting fried foods—cornstarch is the most reliable choice because it is cheaper and easier to find in any grocery store.
Key Takeaways
- Cornstarch replaces potato starch in a one-to-one ratio for thickening sauces, gravies, and soups.
- Arrowroot powder works well in delicate baked goods and produces a lighter texture than cornstarch.
- Tapioca starch creates chewier results and works best in pie fillings and Asian noodle dishes.
- Rice flour and all-purpose flour thicken liquids but produce different textures and may require slightly more of the ingredient.
- For baking, the best substitute depends on whether you want a tender crumb (arrowroot) or a sturdier structure (all-purpose flour).
Arrowroot powder for lighter, more delicate results
Arrowroot powder is a starch made from the arrowroot plant and works almost identically to potato starch in baking. It produces an even more delicate crumb than potato starch, making it the best choice if you are baking cakes, cookies, or pastries where tenderness matters. Use it in a one-to-one ratio as a direct swap.
In sauces and gravies, arrowroot thickens at a lower temperature than cornstarch and creates a clearer, more transparent finish. This makes it ideal for fruit pie fillings, glazes, and Asian sauces where you want the color of the filling to show through. The drawback is cost—arrowroot powder is more expensive than cornstarch and less widely stocked in regular grocery stores.
Tapioca starch for chewier texture and Asian cooking
Tapioca starch (also called tapioca flour) comes from the cassava root and thickens liquids reliably, though it produces a slightly chewier, more elastic texture than potato starch. This makes it especially useful in pie fillings, puddings, and Asian noodle dishes where a bit of chew is desirable. Use it in a one-to-one ratio.
Tapioca starch can leave a slightly grainy mouthfeel if not cooked long enough, so stir sauces for a full minute after they reach a boil. It also breaks down if overcooked or stirred too vigorously, so handle it gently once thickening begins. For baking, tapioca starch works but produces a denser result than potato starch, so it is better suited to custard-based desserts than to cakes.
All-purpose flour for thickening without specialty starches
All-purpose flour thickens sauces and gravies but requires about 50 percent more of it than you would use potato starch. A sauce thickened with flour also needs to cook longer—at least two to three minutes at a boil—to remove the raw flour taste. The result is slightly cloudier and has a more pronounced flour flavor, which works well in beef stews and brown gravies but less well in delicate sauces.
For baking, all-purpose flour is not a direct substitute because it contains gluten and protein that change how dough and batter behave. If you use it to replace potato starch in a cake recipe, the cake will be tougher and denser. It works better as a replacement in pie crusts, biscuits, and other items where a sturdier structure is acceptable.
Rice flour for Asian dishes and gluten-free baking
Rice flour thickens sauces but produces a slightly grainier texture than potato starch. It works best in Asian cooking—particularly in rice paper, noodle dishes, and stir-fry sauces—where the flavor and texture are already expected. Use about 25 percent more rice flour than you would potato starch, and cook sauces for at least two minutes after thickening to eliminate graininess.
In baking, rice flour produces a denser, more crumbly result than potato starch. It is useful in gluten-free baking when combined with other gluten-free flours, but on its own it will not create the tender crumb that potato starch provides. Rice flour also has a slightly sweet, mild flavor that can affect delicate baked goods.
when ready mashed potato flakes as an emergency option
when ready mashed potato flakes are mostly starch and can thicken sauces in a pinch, though they add potato flavor and a slightly grainy texture. Use them only when you have no other starch available, and strain the sauce afterward to remove any lumps. They work better in savory dishes like soups and gravies than in sweet applications.
when ready potato flakes are not suitable for baking because they contain added ingredients like salt, butter, and milk powder that will affect flavor and texture. They also absorb moisture differently than pure starch, so baked goods may turn out dry or dense.
Choosing the right substitute based on what you are making
For thickening sauces, gravies, and soups, cornstarch is the fastest and cheapest choice. For baking cakes and pastries where texture matters, arrowroot powder is best. For pie fillings and Asian dishes, tapioca starch creates the texture you want. If you have none of these starches on hand, all-purpose flour works but requires more of it and longer cooking time.
The table below shows how each substitute performs in common cooking tasks:
| Substitute | Best For | Ratio to Potato Starch | Key Difference |
|---|---|---|---|
| Cornstarch | Sauces, gravies, fried foods | 1:1 | Thickens faster, glossier finish |
| Arrowroot powder | Cakes, pastries, clear glazes | 1:1 | More delicate crumb, clearer finish |
| Tapioca starch | Pie fillings, Asian noodles | 1:1 | Chewier texture, elastic mouthfeel |
| All-purpose flour | Brown gravies, sturdy baked goods | 1.5:1 | Cloudier, needs longer cooking |
| Rice flour | Asian cooking, gluten-free baking | 1.25:1 | Slightly grainy, mild sweet flavor |
Frequently Asked Questions
Can I use baking powder or baking soda instead of potato starch?
No. Baking powder and baking soda are leavening agents that make baked goods rise; they do not thicken liquids. Potato starch is a thickener. Using one in place of the other will ruin the recipe.
Does cornstarch work the same way in pie filling as potato starch?
Yes, cornstarch thickens pie filling in a one-to-one ratio and produces a similar result. The filling may be slightly glossier and set up a bit faster. If you prefer a softer, more delicate filling, use arrowroot powder or tapioca starch instead.
What if my sauce breaks or becomes lumpy when I use a substitute?
Lumps usually mean the starch was not mixed smoothly into cold liquid before heating. Always mix starch with a small amount of cold water or broth first, stir until smooth, then add it to the hot sauce while whisking constantly. Cook for at least one minute after adding to allow the starch to fully thicken.
Can I use potato starch and cornstarch together in the same recipe?
Yes. Mixing starches is common in baking and sauce-making. You might use half cornstarch and half arrowroot powder in a cake for a balance between tenderness and structure, or combine tapioca and cornstarch in a pie filling for both chew and clarity.
Is potato starch the same as potato flour?
No. Potato starch is pure starch extracted from potatoes and is very fine and white. Potato flour is made from whole dehydrated potatoes and contains fiber, protein, and other potato solids. They behave differently in cooking and are not interchangeable.