Can rice flour be substituted for all-purpose flour?
You can use 3/4 cup of rice flour to replace 1 cup of all-purpose flour. However, baked goods made only with rice flour tend to crumble and be gritty, so it’s better to use a combination of flours to more closely resemble a product made with wheat. The Celiac Sprue Association lists many flour formulas on its website. One popular formula, developed by cookbook author Bette Hagman, combines 2 cups of rice flour with 2/3 cup potato starch and 1/3 cup tapioca starch.