What Is Potato Starch — and Why Use It?
Potato starch is a fine, bright-white powder extracted from crushed raw potatoes. The potatoes are pulverized, the starch granules are washed out and separated from the fiber and protein, and the resulting slurry is dried into the silky powder you find in grocery stores. Because it's pure starch — no protein, no fiber — it behaves differently from potato flour (more on that critical distinction below).
In the kitchen, potato starch does three things remarkably well:
- Thickening sauces, soups, and gravies. Potato starch has a lower gelatinization temperature than cornstarch, meaning it activates around 140–150°F (60–65°C) rather than the 180°F+ required by cornstarch. It produces a glossy, translucent sheen that looks beautiful in fruit sauces, stir-fry glazes, and clear gravies. The mouthfeel is clean and silky — never pasty or stodgy.
- Gluten-free baking. In gluten-free breads, muffins, cakes, and cookies, potato starch contributes lightness and tenderness. It's a common ingredient in all-purpose gluten-free flour blends (often paired with sorghum flour, rice flour, and tapioca starch) because it traps moisture and prevents the dense, crumbly texture that plagues many gluten-free baked goods.
- Crisp coatings. Potato starch is a secret weapon for ultra-crispy fried foods. It's the traditional coating for Japanese karaage (fried chicken) and Korean fried chicken, producing a shatteringly crisp crust that stays crunchy longer than wheat-flour batters. Its high amylopectin content and low protein levels mean it fries up light and brittle rather than leathery.
It's also prized for being exceptionally neutral in flavor — unlike some other starches, potato starch won't add any vegetal, earthy, or "starchy" taste to your dish.
Potato Starch vs. Potato Flour: Don't Mix Them Up
This might be the single most important thing to understand before you start substituting. Potato starch and potato flour are not the same product, and they are not interchangeable.
Potato starch is extracted starch only. Whole potatoes are crushed and washed to isolate just the starch granules, then dried. The result is a pure white, flavorless powder that functions solely as a thickener and texture agent.
Potato flour is made from whole potatoes — they're cooked, dried, and ground into a fine meal. It's cream-to-yellowish in color, carries a distinct cooked-potato flavor, and absorbs far more liquid than potato starch. It's used in bread doughs (where it adds moisture and a tender crumb), potato pancakes, and as a gluten-free flour in heavy, hearty baked goods.
Here's the key: if your recipe calls for potato starch as a thickener or lightening agent and you use potato flour instead, you'll get a dense, potato-flavored result that thickens far less efficiently. Conversely, using potato starch in a bread recipe that calls for potato flour will leave you with a gummy, under-structured loaf. Always read the label and confirm which one your recipe actually needs before reaching for a substitute.
The 6 Best Potato Starch Substitutes (Ranked)
Below are six reliable replacements for potato starch, ranked by how well they match potato starch's performance across common uses. Each entry includes the substitution ratio, how it behaves under heat and freezing, and where it shines.
| Substitute | Ratio (for 1 tbsp potato starch) |
Thickening Power | Heat Tolerance | Freeze Stability | Gluten-Free |
|---|---|---|---|---|---|
| Cornstarch | 1 tbsp | High | Good (needs 180°F+) | Moderate — may weep | ✔ |
| Arrowroot | 1 tbsp (or 2¼ tsp) | Very high | Fair — breaks down with prolonged heat | Excellent | ✔ |
| Tapioca Starch | 1½ tbsp | High | Good | Excellent | ✔ |
| Rice Flour | 1½ tbsp | Moderate | Excellent | Moderate | ✔ |
| Wheat Flour | 2 tbsp | Moderate | Excellent (needs cooking) | Poor — separates | ✘ |
| Xanthan Gum | ⅛–¼ tsp | Extremely high | Excellent | Excellent | ✔ |
1. Cornstarch — The All-Rounder
Ratio: 1:1 (1 tablespoon cornstarch = 1 tablespoon potato starch)
Cornstarch is far and away the most accessible potato starch substitute — you almost certainly have a box in your pantry right now. It thickens with similar power, though it requires a higher temperature to activate (around 180–200°F / 82–93°C). Where potato starch produces a glossy, translucent sauce, cornstarch yields a slightly cloudier, more matte finish. For most gravies, stir-fries, and fruit pie fillings, this difference is invisible in practice.
Coatings get a crisp, light crunch, though they won't be quite as shatteringly brittle as potato-starch coatings. For gluten-free baking, cornstarch works well in blends — combine it with a protein-rich flour like almond or sorghum for structure.
Freeze stability: Moderate. Cornstarch-thickened sauces can weep liquid when thawed. If you're making a dish destined for the freezer, tapioca or arrowroot are better bets.
Best for: Everyday gravy, stir-fry sauces, fruit pie fillings, gluten-free baking blends. See our full cornstarch substitute guide →
2. Arrowroot — The Clear & Glossy Choice
Ratio: 1:1 (or slightly less — 2¼ teaspoons per tablespoon of potato starch)
Arrowroot powder (sometimes labeled arrowroot starch or arrowroot flour) is the closest match to potato starch's glossy, crystal-clear finish. It thickens at a low temperature (roughly 140–150°F) and gives sauces a beautiful sheen that's perfect for fruit glazes, clear Asian sauces, and delicate dessert syrups.
The catch? Arrowroot breaks down under prolonged high heat. If you simmer an arrowroot-thickened sauce for more than 10 minutes, it will thin out. For this reason, arrowroot works best in recipes where you add the slurry at the very end of cooking and serve immediately. It also doesn't play nicely with dairy — arrowroot-thickened cream sauces can turn slimy.
Freeze stability: Excellent. Arrowroot is one of the few starches that survives freezing and thawing without separating, making it ideal for freezer-friendly pie fillings and make-ahead sauces.
Best for: Fruit sauces and glazes, clear soups, last-minute thickeners, freezer-bound dishes. Avoid in dairy-based sauces and long-simmered stews. See our full arrowroot substitute guide →
3. Tapioca Starch — The Chewy, Freeze-Friendly Option
Ratio: 1½ tablespoons tapioca starch per 1 tablespoon potato starch
Tapioca starch (also called tapioca flour) is extracted from cassava root and brings a unique quality to the table: a pleasant, slightly chewy bounce. If you've ever had Brazilian pão de queijo or boba tea pearls, that's tapioca at work. In sauces, it creates a glossy finish similar to potato starch, though it's slightly thicker and more gel-like.
For frying, tapioca starch is an excellent potato starch alternative — it's a core ingredient in many gluten-free tempura batters and produces a light, crispy crust. In gluten-free baking, it adds elasticity and chew that mimics gluten's structural role.
Freeze stability: Excellent. Tapioca is the gold standard for freezer-ready pie fillings and won't turn spongy or watery after thawing.
Best for: High-moisture pie fillings (cherry, blueberry), gluten-free breads where chew is desirable, crispy fried coatings.
4. Rice Flour — The Sturdy, Allergy-Friendly Workhorse
Ratio: 1½ tablespoons rice flour per 1 tablespoon potato starch
Rice flour (both white and brown varieties) is less of a one-to-one thickener and more of a versatile, sturdy alternative — especially useful if you're avoiding corn or nightshades. As a thickener, it requires more product and longer cooking time, and the result is opaque rather than glossy. Think of a classic rice-flour-thickened congee or Asian dessert — it won't win a clarity contest, but it gets the job done.
Where rice flour truly excels is in frying. It produces a delicate, crispy, tempura-like crust and is widely used in Asian fried chicken recipes. It's also a staple in gluten-free flour blends, where its neutral flavor and wide availability make it a reliable foundation.
Freeze stability: Moderate. Rice-flour-thickened sauces can become grainy after freezing. For baked goods, this is less of a concern.
Best for: Frying batters and coatings, gluten-free baking blends, savory sauces where opacity isn't an issue. See our full rice flour substitute guide →
5. Wheat Flour — The Pantry Standby (Not Gluten-Free)
Ratio: 2 tablespoons wheat flour per 1 tablespoon potato starch
All-purpose wheat flour is the most available option when you're in a pinch, but it comes with significant caveats. First and most obviously, it contains gluten — so it's off the table for anyone with celiac disease, gluten sensitivity, or anyone cooking gluten-free. Second, it requires approximately twice as much flour to achieve the same thickening as potato starch. Third, the method matters: you can't just whisk wheat flour into a hot liquid. You must either cook it into a roux (fat + flour) first or create a slurry (flour + cold water) to avoid lumps. And even with those techniques, flour-thickened sauces are opaque and can taste pasty if undercooked.
On the plus side, wheat flour handles prolonged simmering without breaking down, making it suitable for stews and braises that bubble on the stove for hours. For fried coatings, seasoned wheat flour produces a satisfying, home-style crunch — though it won't replicate potato starch's light, brittle crispness.
Best for: Traditional gravies and cream sauces, long-simmered stews, breaded fried foods. Not suitable for gluten-free recipes or clear sauces.
6. Xanthan Gum — The Potent Wildcard
Ratio: ⅛ to ¼ teaspoon xanthan gum per 1 tablespoon potato starch
Xanthan gum is a fermentation-derived hydrocolloid, not a starch, and it operates in a completely different league. A tiny pinch — we're talking one-eighth of a teaspoon — can thicken an entire cup of liquid. This potency means the margin for error is razor-thin: use too much, and your sauce transforms into an unappetizing, snotty gel.
Xanthan gum disperses easily in hot or cold liquids, provides a smooth, stable thickness, and tolerates both high heat and freezing with zero breakdown. It's a hero ingredient in gluten-free baking, where it replicates gluten's stretch and structure — most commercial gluten-free flour blends already contain it. For sauces, it's best used as a finisher (sprinkle and whisk) rather than as a primary thickener, since it doesn't produce the same body and mouthfeel as starch-based thickeners.
Pro tip: Mix xanthan gum with a tiny amount of oil or sugar before adding it to liquid, which prevents it from clumping into gummy fish-eye blobs.
Best for: Gluten-free baking (adds structure), cold sauces and dressings, stabilizing emulsions, quick no-cook thickeners.
Quick Reference: Which Substitute to Use When
| If you're making… | Use this substitute | Why |
|---|---|---|
| A clear fruit glaze or dessert sauce | Arrowroot | Glossy, crystal-clear finish; low-temp activation |
| Thanksgiving gravy | Cornstarch | Neutral flavor, reliable thickening, always on hand |
| Gluten-free chocolate chip cookies | Tapioca starch | Adds chew and structure; mimics gluten elasticity |
| Korean fried chicken | Rice flour or cornstarch | Crispy crust; both produce light, brittle crunch |
| A beef stew simmered for hours | Wheat flour (roux) | Handles prolonged heat without breaking down |
| A freezer-friendly cherry pie | Tapioca starch | Best freeze-thaw stability; won't weep or separate |
| Gluten-free sandwich bread | Xanthan gum + tapioca | Xanthan for structure, tapioca for moisture and chew |
| A last-minute pan sauce | Cornstarch slurry | Fast, foolproof; dissolves instantly in cold water |
Pro Tips for Substituting Potato Starch
- Always make a slurry first. Like potato starch, most substitutes must be dissolved in cold water before being added to hot liquid. Dumping dry starch directly into a simmering pot guarantees lumps. Combine the starch with an equal amount of cold water, stir until smooth, then whisk into your hot dish.
- Add at the end of cooking. Potato starch and its closest substitutes (arrowroot, tapioca, cornstarch) will thin out if boiled too long. Whisk in your slurry during the last minute or two of cooking, just long enough for the sauce to bubble and thicken.
- Reheat gently. Sauces thickened with starch-based substitutes will be thicker on day two. Reheat slowly over medium-low heat, adding a splash of water or broth to loosen if needed. Microwaving in short bursts with a stir between each works too.
- Consider your audience. If you're cooking for someone with multiple dietary restrictions (gluten-free and corn-free and nightshade-free), arrowroot and tapioca are your safest bets. Wheat flour is the most restrictive since it contains gluten.
- Temperature matters for the roux method. If you're using wheat flour, cook the flour-butter mixture for at least 2–3 minutes to eliminate the raw-flour taste. A blonde roux (light golden) is ideal for most sauces; a darker roux adds nutty depth but less thickening power.
Frequently Asked Questions
Can I substitute potato flour for potato starch?
No — and this mistake will ruin your recipe. Potato flour is made from whole dried potatoes and has a distinct potato flavor, beige color, and high absorbency. It's meant for bread doughs and heavy baked goods, not for thickening sauces. If your recipe calls for potato starch as a thickener, using potato flour will give you a dense, potato-tasting, poorly thickened result. The two products are entirely different ingredients with different purposes.
What's the best potato starch substitute for gluten-free baking?
For gluten-free baking specifically, a combination usually works better than a single substitute. Replace the potato starch in your blend with tapioca starch at a 1:1 ratio for lightness, and add ¼ teaspoon of xanthan gum per cup of flour blend if the recipe doesn't already include a binder. Tapioca provides the tender, moist crumb that potato starch delivers, while xanthan gum supplies the structure and elasticity that gluten-free doughs lack. If tapioca isn't available, cornstarch is a solid solo alternative — use it 1:1. Expect baked goods to be slightly less chewy and a touch more delicate than the original.
Can I use cornstarch instead of potato starch for frying?
Yes — cornstarch is an excellent substitute for potato starch in fried coatings. It produces a light, crisp crust similar to what you'd get with potato starch. The crust won't be quite as shatteringly brittle and may not stay crispy for as long, but for home cooking, the difference is minor. For the closest texture to potato-starch fried chicken, try a 50/50 blend of cornstarch and rice flour (or cornstarch and tapioca starch). Many Korean fried chicken recipes use this exact combination.
Which potato starch substitute is best for freezing?
Tapioca starch and arrowroot are tied for best freeze-thaw stability. Both retain their thickening power and texture after freezing and thawing without weeping, separating, or turning spongy — a common problem with cornstarch-thickened fillings. For freezer-bound fruit pies, cobblers, and make-ahead sauces, choose tapioca starch (1½ tablespoons per tablespoon of potato starch) or arrowroot (1:1). Xanthan gum is also freeze-stable, but use it sparingly — ⅛ teaspoon goes a long way.
Why did my arrowroot-thickened sauce turn watery?
Arrowroot breaks down when subjected to prolonged high heat. If you add arrowroot slurry to a bubbling sauce and keep cooking, the starch molecules degrade and the sauce thins out — sometimes returning almost to its original, unthickened state. To prevent this, add arrowroot only in the final minute of cooking, remove the pan from heat as soon as the sauce thickens, and serve immediately. Also avoid combining arrowroot with dairy, which can cause a slimy, unpleasant texture.
Is potato starch the same as cornstarch?
No — while they're both pure starches used as thickeners, they behave differently. Potato starch thickens at a lower temperature (around 140–150°F vs. cornstarch's 180°F+), produces a glossier finish, and has a slightly higher thickening power. Potato starch also breaks down more readily under prolonged heat. They're close enough to substitute 1:1 in most recipes, but potato starch is preferred when you want a crystal-clear, glossy sauce, and cornstarch is better for dishes that need longer cooking times.
Can I make my own potato starch at home?
Yes, though it's a bit of a project. Grate raw potatoes (russets work best for their high starch content), soak the shreds in water for 10–15 minutes, then squeeze and strain the liquid through a fine-mesh sieve or cheesecloth. Let the strained liquid sit undisturbed for 20–30 minutes — the starch will settle to the bottom as a white layer. Carefully pour off the water, spread the wet starch on a baking sheet, and dry it in a low oven (around 150°F) or simply air-dry overnight. One large russet potato yields roughly 2–3 tablespoons of potato starch. Store completely dried starch in an airtight container. It's a fun experiment, but for the effort involved, most cooks find a store-bought substitute far more practical.
Bottom Line
Running out of potato starch doesn't have to derail your recipe. Cornstarch is the best all-purpose substitute — it's affordable, available everywhere, and works 1:1 in almost every application. For dishes where visual appeal matters (fruit glazes, clear sauces), arrowroot delivers that signature glossy sheen. If you're baking gluten-free, tapioca starch (plus a pinch of xanthan gum for structure) gives you the tender, moist crumb that potato starch provides. And for freezer-bound dishes, tapioca and arrowroot are your go-tos — they won't break down or turn watery when thawed.
As long as you know your substitute's ratio, its heat tolerance, and whether it plays nicely with your other ingredients, you can confidently swap potato starch out of any recipe. Just remember: potato starch and potato flour are two entirely different products. Check that label before you start.
This article is part of our complete ingredient substitution series. For more guides, visit The Swap Guide — the smart cook's resource for ingredient replacements.