Measure the rice. Add 2 cups of dry, uncooked white rice to your work area.
Add rice to the grinder. Place ½ to 1 cup of rice into a high-speed blender or grain mill. Avoid overfilling to ensure even grinding.
Grind the rice. Blend for 30–60 seconds, or until the rice becomes a fine powder. If needed, stop and stir the rice between pulses for even grinding.
Sift the flour. Pour the ground rice through a fine mesh sieve into a bowl. This removes any coarse particles.
Regrind larger pieces. Return the coarse rice left in the sieve to the grinder and blend again until finely ground. Repeat until all the rice has been processed.
Cool if necessary. If the flour feels warm after grinding, allow it to cool completely before storing.
Store properly. Transfer the finished white rice flour to an airtight container or glass jar. Store in a cool, dry place for up to 3 months, refrigerate for up to 6 months, or freeze for up to 1 year.