How to Make Oat Flour

Close up of homemade oat flour in a bowl.
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No need to head to the grocery store - here's how to make your own oat flour at home! All you need is fresh oats, and in less than 5 minutes you'll have a versatile flour that adds both nutrition and flavor to a wide range of recipes. It also makes a great wheat flour alternative in gluten-free baking!

  • Author: alexandra
  • Total Time: 5 minutes
  • Yield: approx. 3 cups
  • Category: ingredients
  • Method: blender
  • Diet: Gluten Free


  • 3 cups old fashioned or quick-cooking oats


  1. Add the oats to a blender or food processor and blend until they reach a fine, flour-like consistency. This can take anywhere from 30 seconds to a few minutes depending on the tool you're using and its speed/power. 
  2. If desired, sift flour before using to remove any larger bits of oats remaining.


Ingredient notes:

  • Steel cut oats can theoretically be used but will take much longer to grind into flour.
  • For 100% gluten-free oat flour, use certified gluten-free oats.

Equipment notes:

  • If you don't own a blender or food processor, you can use a coffee/spice grinder. Work with smaller quantities (about 1/2 cup) of oats at a time. 


  • Store flour in an airtight container or sealed bag in the pantry or refrigerator. It should stay fresh for anywhere from 3-6 months, but can also be kept in the freezer to extend its shelf life.

Helpful Tips:

  • If you find that the oats are spinning around rather than catching the blade of the appliance, try adding more to increase the traction. 
  • 1 cup of oats (92 grams) will yield approximately 1 cup of oat flour (94 grams).