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How to Make Oat Flour

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Hi Bold Bakers!

Welcome to the third installment of my Bold Baking Boot Camp. This week we are making our own Gluten Free Flours including Oat Flour, Almond Flour and Chickpea FlourLast week, I shared a Sugar Substitutes Chart and the week before I shared my Weight Conversion Chart

You don’t have to eat gluten free to use nut and oat flours in baking. They are a very common ingredient in today’s world. They give great texture and flavor to your cakes, cookies and recipes in general. I’m going to show you how to make 3 of the most popular gluten free flours with ease and tell you how you can substitute them.

It’s great to know how to make your own ingredients just like this flour. Whether certain ingredients are available in your county or you find you are just plain out of an ingredient remember you can actually make a lot of them yourself. In my Bold Baking Basics series you can find out how to make many ingredients like cake flour, brown sugar, self raising flour and much much more.

Important Note: All of the flours I’m going to show you can replace regular white flour in recipes like cakes, cookies, crepes, cupcakes, etc. However because of their different texture and density you generally don’t substitute a gluten free flour for the same amount of a nut flour, 1:1. Gluten free flours aren’t generally as fine as regular white flours so they will absorb liquids differently and that’s why you will use less flour to counter that.

How to Substitute Oat Flour:

Substitute 1 cup of regular white flour for 1 1/3 cup Oat Flour. Note if it seems too stiff then use less and also you can add more liquid.


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Make more gluten free flours including Almond Flour and Chickpea Flour.

4.67 from 6 votes
Baking Conversion Chart, Weight Conversion Chart for Baking, Weight Conversion Chart, Gemma Stafford, Bigger Bolder Baking, Bold Baking Basics, Bold Baking Bootcamp, Baking 101, Baking Basics
How to Make Oat Flour
Prep Time
5 mins
Total Time
5 mins

Easily learn how to make oat flour. Whether you eat gluten free or not, oat flour adds a lovely taste and texture to your baking.

Course: Ingredient
Cuisine: American
Author: Gemma Stafford
  • Rolled oats (not steel cut oats)
  1. Using a high powered blender blend the oats for roughly 2 minutes until fine and the consistency of flour.
  2. Sieve the oat flour to remove any lumps of oats.
  3. Store in a labeled airtight container for 8 weeks or even in the fridge

Watch the Recipe Video!



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Katherine Cowgill by Teren Oddo Oct. 2015

Meet Gemma

Hi Bold Bakers! I’m Gemma Stafford, a professional chef originally from Ireland, and I’m passionate about sharing my years of experience to show you how to make game-changing baking recipes with over-the-top results! Join more than 1 Million other Bold Bakers in the community for new video recipes every week!

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  1. Tina Stevens on August 12, 2019 at 10:29 am

    When making oat flour should I use quick oats or old fashioned?

    • Gemma Stafford on August 12, 2019 at 8:22 pm

      For the flour it actually doesn’t matter Tina, you can use either.


  2. Shenique Hines on May 30, 2019 at 7:56 pm

    I am wanting to bake cookies with oat flour would you happen to know a ratio for how much I should use compared to a.p. Flour

    • Gemma Stafford on May 30, 2019 at 11:41 pm

      Hi Shenique,

      So oat flour isn’t a 1:1 ratio for a.p flour. you would use less oat flour than a.p flour. It really depends on your recipe but I would say 1/2 to 3/4 of what the ap flour is.

      Hope this helps,

  3. Peggy on April 13, 2019 at 4:47 pm

    I have a question, I saw old fashion oats at the store but was very if they don’t say gluten for then they have gluten in them. What do i need to get, regular old fashion or something special. Thank you, love your recipes.

    • Gemma Stafford on April 15, 2019 at 4:19 pm

      Hi, most oats are gluten free naturally 😀

  4. Camille on January 22, 2019 at 12:44 pm

    Hi Gemma! I want to dp some of your recipes but the ones that I want takes oat flour and I can’t make some right now. Is it possible to buy some at the store?

    • Gemma Stafford on January 23, 2019 at 8:50 pm

      At some stores yes, especially health food markets.

  5. Pattie Jns on January 16, 2019 at 6:34 pm

    Gemma, I have a bread machine. I mixed oatmeal flour with my bread flour. I use 1 1/3 cup of oat flour and 2 1/2 cup of bread flour. and 1 1/4 of water. plus 2Tablespoon of Flax seed. and the rest of the recipe. what should I have done with the oatmeal flour, the bread did not rise as high as usual. i thought I used your chart correctly. please advise what to do.
    there was oats,salt, honey, dry milk 2Tablespoons, and 2 teaspoon of active dry yeast in the recipe.
    normal ratio of bread flour was 3 3/4 cups. advise would be helpful. love to make bread, an your web site. look everyday..
    thank you so much.

    • Gemma Stafford on January 19, 2019 at 1:52 am

      Hi Pattie,
      This sounds like a lovely bread! I will have to try it.
      The issue is that the oats have reduced the gluten in the flour. This will affect the rise in the bread. The bread however should be delicious, with an open texture. A slower proofing, if that is possible in the bread maker, will help.
      This dough I think would also work really well as a fermented dough, no kneading, just proof overnight and bake, as in this one (
      I hope you get this to your taste, I like your recipe!
      Gemma 🙂

      • Pattie Jns on January 19, 2019 at 4:29 pm

        thank you so much Gemma for answering so quickly. my bread has the texture of most European bread. a in fact the picture of your wheat no knead shows the texture, an reduced size., oblong not round. My husband liked it, so will make again. … I used to when t he children were home made bread every other day from scratch. just love the taste, smell, and flavor. but as getting older don’t eat as much bread but do want the healthiest as possible. You recipes will help in many ways to cut cost, an stay healthy, . the bread machine is just faster, but make things myself as well. thank you again.

        • Gemma Stafford on January 19, 2019 at 7:39 pm

          I am delighted to hear that, enjoy!

  6. Tom on January 9, 2019 at 7:11 am

    Hi Gemma. Great site thank you. What flour would best for baking bread?

    • Gemma Stafford on January 9, 2019 at 4:59 pm

      Thank you, welcome! I suggest bread flour, or i love to experiment with wheat and regular flour mixed. Enjoy!

  7. Désirée on April 10, 2018 at 12:03 pm

    Is it true that to break the oats makes them less healthy? I’ve heard that one’s body processes quick oats and oat flours like sugar. . .

    • Gemma Stafford on April 10, 2018 at 1:56 pm

      Hi Desiree,
      The reality is that there are carbs in lots of foods, and these turn to sugars. but complex sugars. Oats are largely starch, with a little sucrose. The starch means that oats take longer to digest, and are more sustaining. I do not know if finer oats behave differently, but I do not think so. A good food, at any time,
      Gemma 🙂

  8. Sadie on April 10, 2018 at 11:57 am

    How many oats will make how much oat flour? I heard something about the volume increasing, and I’m not sure exactly how the measurements work (I don’t like making more than I need of something, and less wouldn’t really work, now would it?)
    — Sadie

    • Gemma Stafford on April 10, 2018 at 2:00 pm

      Hi Sadie,
      Yes, the volume will increase, but not the weight. This is a difficult concept, but think about it in cups.
      40zs/125g of oats will make 4ozs/125g of oat flour. A cup of rolled oats will make about 1 1/2 cups of oat flour, but remember this is a different ingredient. Try it, use a scales to be more accurate,
      Gemma 🙂

  9. Kojo on February 7, 2018 at 3:48 pm

    Hi Gemma can i use oat flour for the microwave muffins? And can you please help me out with some measurements. Thank you

    • Gemma Stafford on February 8, 2018 at 2:42 am

      Hi Kojo,
      You can try this, use the same measurements.
      Oat flour is a different consistency to wheat flour, it may like to be mixed with another flour, to make it light. If you are gluten free get to know the mixes which work best for any recipe. There are a number of good sites online dedicated to this.
      As this is such a small recipe it is worth trying, and then adjusting!
      Gemma 🙂

  10. Kiki Damayanto-Amar on January 5, 2018 at 1:25 am

    Hi gemma, I like measuring my ingredients for baking. Can you tell me the measurements for 1 cup of oat and almond flour? Thank you ????

    • Gemma Stafford on January 5, 2018 at 11:28 am

      Haha! I am not sure what you want here!
      If you weight the oats, and almonds, and process them, the weight will not change!
      Weight out what you need for your recipe,
      Gemma 🙂

      • Kiki Damayanto-Amar on January 6, 2018 at 3:52 pm

        Sorry, I mean the conversion weight of 1 cup of oat or almond flour? I like to weight my ingredients.

        • Gemma Stafford on January 7, 2018 at 4:01 am

          Hi kiki,
          I think I am misunderstanding you!
          1 cup of oat flour will weigh about 90g depending on how you load your cup.
          1 cup of almond flour will be about 100g.
          You probably know that cups are measures of volume, not weight, and so the weight equivalent will be different for almost every food type.
          Gemma 🙂

          • Ama A. on December 2, 2018 at 1:37 am

            Hello Jemma. Can I mix oat flour with cake flour for cakes? I would like to bake a moist and fluffy cake. What are the parts of oat flout to cake flour that I should use. Also, do I add yeast or baking powder to the combination of these two flours? Tia.

            • Gemma Stafford on December 2, 2018 at 5:23 am

              Hi Ama,
              I cannot give you a broad answer to this question, I am sorry.
              Oat flour does not make a light and fluffy cake, white wheat flour does. Oat flour is good for things like banana bread, to make it moist, but not fluffy!
              If you are going to do this you need to choose a recipe designed to take it, that will be best, it gives a dense result,
              Gemma 🙂

  11. Mary on September 15, 2017 at 6:44 am

    Can pat flour make something gummy?

    I’ve used a pancake recipe forever with millet and sorghum. Binders are psyllium and egg. They turn out great. I decided to make an oat sourdough and made the same recipe, all the same ingredients, same flour/liquid ratio. The pancakes are super gummy.

    • Gemma Stafford on September 16, 2017 at 11:37 am

      Hi Mary,
      thank you for this input here. it is really helpful. we are learning together, i appreciate you sharing your experience,
      Gemma 🙂

  12. Priya on August 17, 2017 at 7:40 pm

    Hi Gemma,
    Just love all your recipes !!! Super easy and cool.. just a question.
    Can we use oat flour in baking mug cakes to rise them ? _priya

    • Gemma Stafford on August 18, 2017 at 1:13 am

      Hi Priya,
      Oat flour is great for some things, but not for everything. ( here is one you may like to try.
      All flour needs a raising agent to help it to rise. Oat flour does not have gluten, so it has a different structure to wheat flour. It can be used for many recipes, but not for all, you will need to experiment a bit!
      Gemma 🙂

  13. Nisalee Balasuriya on April 1, 2017 at 6:02 pm

    Hi Gemma, I have a huge tin of quick cooking oats, not a big fan of oats so I thought of using it as a flour, would they work just as well to make the oat flour? Thanks!

    • Gemma Stafford on April 2, 2017 at 2:43 am

      Yes! This is a good use for these, though they are processed, and not quite the same thing as rolled oats.
      Do try it, it will be worth the experiment,
      Gemma 🙂

  14. Martha Nguyen on March 14, 2017 at 1:07 pm

    How many cup for oatmeal flour equal of chocolate chip cookies?

    • Gemma Stafford on March 15, 2017 at 4:12 am

      Hi Martha,
      You will need to experiment with this! I have not used this in this dough. It is a matter of not getting the dough too wet, flours behave in different ways. Add more flour if it feels sticky. Make a small batch to test it, that is what I would need to do!
      Gemma 🙂

  15. Ali on January 19, 2017 at 10:57 am

    Do you have a flour substitute chart?

    • Gemma Stafford on January 19, 2017 at 1:14 pm

      Hi Ali,
      do check out all of the post on the substitute flours, there is a lot of information there.
      I will put a chart together when I get a moment,
      Gemma 🙂

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