Pick substitutes that preserve tenderness, aeration, and even rise in cake batters. Cake structure depends on balanced fat, sugar, and hydration. Wrong swaps can create a dense or dry crumb.
Yes. Start with Arrowroot Powder at 1:1, then adjust liquid or bake time in small steps after a test batch.
Use 1:1
Very similar behaviour. Better for acid-based and frozen sauces.
View full adjustment notes →The home-baker trick of swapping 2 tbsp cornstarch into a cup of AP flour works because pure starch lowers the protein percentage of the blend by roughly two points — that protein dilution is the whole reason a pound cake or vanilla sponge ends up tender rather than tight. Tapioca starch breaks the trick. Its long amylopectin chains hydrate into a stretchy gel inside batter, and a fine-crumbed cake comes out with a faintly chewy, almost rubbery pull. Arrowroot tracks cornstarch closely across the 325-350F window most cakes bake in, which is why it subs cleanly at 1:1.
On CupOrGram, 1 cup of cornstarch is treated as 128 grams. Use the conversion page if you want the original ingredient weight before choosing a substitute.
Cornstarch cups to grams →Arrowroot Powder at 1:1 is the closest match — Very similar behaviour. Better for acid-based and frozen sauces. If that is unavailable, Tapioca Starch (Use 2 tbsp tapioca per 1 tbsp cornstarch) or All-Purpose Flour (Use 2 tbsp flour per 1 tbsp cornstarch).