Cornstarch substitutes
Cornstarch is a pure starch used primarily as a thickener and, in baking, as a tenderizer by diluting the protein content of flour. It produces a clear, glossy gel when heated in liquid, which is why it's the standard choice for fruit pie fillings and Asian-style sauces. Substituting requires attention to ratio, final appearance, and heat tolerance — not all starches behave the same way at high temperatures or when frozen.
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| Rank | Substitute | Ratio (replaces 1 cup Cornstarch) | Notes |
|---|---|---|---|
| #1 | Arrowroot powder | 1 tbsp arrowroot per 1 tbsp cornstarch | Produces a similarly clear, glossy gel and works slightly better in acidic sauces; breaks down faster at high heat and doesn't hold well when reheated, so use it for dishes served immediately. |
| #2 | All-purpose flour | 2 tbsp all-purpose flour per 1 tbsp cornstarch | Works reliably in gravies, pan sauces, and stews, but produces a cloudy, opaque result and a slightly starchy flavor if not cooked for at least 1–2 minutes; do not use in clear or glossy applications like fruit pie fillings. |
| #3 | Potato starch | 1 tbsp potato starch per 1 tbsp cornstarch | Thickens at a lower temperature than cornstarch and produces a clear gel; avoid prolonged cooking or it will thin back out — add it near the end of cooking and do not boil hard after adding. |
| #4 | Tapioca starch | 2 tsp tapioca starch per 1 tbsp cornstarch | Produces a very glossy, slightly elastic gel with a mild flavor; a good choice for fruit pie fillings and puddings, but can turn stringy in dairy-based sauces — avoid in cream or milk-based contexts. |
| #5 | Rice flour | 2 tbsp rice flour per 1 tbsp cornstarch | Works in a pinch for thickening but is noticeably weaker and produces a slightly grainy texture in some sauces; more reliable in baked goods (cookies, shortbread) where cornstarch is used as a tenderizer rather than a thickener. |
| #6 | Instant tapioca (quick-cooking tapioca) | 1 tbsp instant tapioca per 1 tbsp cornstarch, ground to a powder first | Widely recommended for fruit pies specifically — it thickens well and handles the acidity of fruit, but must be ground in a spice grinder or blender before use or the filling will have noticeable gel beads; works in a pinch but the texture is less smooth than tapioca starch. |
Following a specific diet?
These substitutes are filtered for dietary restrictions:
When to be careful
Cornstarch is nearly irreplaceable in applications requiring a neutral-flavored, freeze-stable, high-clarity gel — such as glazes, puddings, or custard-style pie fillings where texture precision is critical. Dishes that will be frozen and reheated will suffer with most substitutes, as arrowroot, tapioca starch, and potato starch all break down and weep on freezing; all-purpose flour is the only option that holds reasonably well through a freeze-thaw cycle.
Why these substitutes work
Cornstarch thickens by a process called starch gelatinization: when starch granules are suspended in liquid and heated above roughly 62–72°C (144–162°F), they absorb water, swell, and burst, releasing amylose chains that form a semi-rigid gel network. Because cornstarch is almost pure starch with no protein or fiber, it produces a clearer, glossier result than flour, which contains gluten-forming proteins and pigments that cloud the sauce. Substitute starches differ in their gelatinization temperature, amylose-to-amylopectin ratio, acid tolerance, and stability under prolonged heat — which explains why a 1:1 swap by volume doesn't always translate to an identical result.
For most everyday thickening tasks — gravies, pan sauces, stews — all-purpose flour at a 2:1 ratio is the most reliable fallback because it’s the ingredient cooks are most likely to have and have used before. The result won’t be glossy, but it will be stable, reheatable, and familiar. For clear or glossy applications like fruit pie fillings, Asian sauces, or glazes, arrowroot powder or tapioca starch are the technically closer matches, with the trade-off being lower heat tolerance and poor behavior on reheating.
The substitutes in the table are ordered by how consistently they perform across the widest range of uses. Potato starch and tapioca starch are reliable in the right context but have narrower windows of success — high heat or prolonged simmering will thin them out in ways that cornstarch resists. Choose based on the specific dish: what temperature it reaches, whether it will be reheated or frozen, and whether appearance (clarity, gloss) matters to the final result.
Frequently asked questions
- Can I substitute cornstarch with flour in a 1:1 ratio?
- No. Flour has roughly half the thickening power of cornstarch by volume. Use 2 tablespoons of all-purpose flour for every 1 tablespoon of cornstarch, and cook the sauce for at least 1–2 minutes after it thickens to remove the raw flour taste.
- Which cornstarch substitute works best for fruit pie filling?
- Tapioca starch (2 tsp per 1 tbsp cornstarch) or instant tapioca ground to a powder (1 tbsp per 1 tbsp cornstarch) are the most widely recommended by baking authorities. Both handle fruit acidity better than cornstarch and produce a glossy, set filling. Arrowroot also works but can turn slimy if the filling is very sugary.
- Does arrowroot work the same as cornstarch in hot sauce or wok cooking?
- No. Arrowroot breaks down quickly at sustained high heat and loses its thickening power if left over heat too long. For stir-fries and wok sauces, cornstarch is the standard and most substitutes will thin out. If you must substitute, add arrowroot off the heat or at the very end of cooking and serve immediately.