How to Make Oat Milk at Home

Here’s a simple oat milk recipe you can make at home! 

Oat milk is a great replacement for dairy milk because it’s better for the planet, more affordable, and you can make it on demand from long-lasting dry ingredients – which means no more worrying about when your milk is going to go bad.

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Better for the Planet

How to Make Oat Milk at Home - better for the planet

Dairy milk has a carbon footprint of 60 grams CO2e per 200 ml glass whereas oat milk has a carbon footprint of only 0.18 grams CO2e per 200 ml glass. Per gallon, that’s a difference of 794 grams CO2e. 

By switching from dairy milk to oat milk for a decade (assuming you drink a gallon every 2 weeks) you would save 207 kg CO2e – that’s the equivalent of burning 228 pounds of coal!


How to Make Oat Milk at Home - affordable

Oat milk has exploded in popularity in recent years. Because of that, it’s tough to find it at a reasonable price. At Whole Foods, the best price I was able to find was $5 for half a gallon. 

Considering you can buy a whole gallon of dairy milk for $2.39, you may be wondering how making this switch could save you money.

The secret is to make it yourself! Don’t worry, it’s not hard, and you can make 3 cups of it in under a minute.

Making oat milk at home only requires a blender and something to filter out the pulp. For filtering, you can use a fine mesh sieve, cheesecloth, or a nut milk bag.

Related: Organic cotton nut milk bags from Amazon.

Homemade oat milk is about half the price of dairy milk, so by switching from dairy milk to homemade oat milk for a decade you would save $459.61!

Long Lasting

How to Make Oat Milk at Home - long lasting

Oat milk itself will only stay good in your fridge for about 4 to 5 days, so you have to make it in small batches. However, the oats will last years in your pantry! It’s nice to be able to make milk whenever you want it and not have to worry about finishing a whole gallon before it goes bad.

Oat Milk Recipe

Recipe Cost: $0.20 | Recipe Carbon Footprint: 0.0279 kg CO2e


1 cup old fashioned rolled oats* ($0.20 | 0.0279 kg CO2e)

3 cups cold water ($0 | 0 kg CO2e**)

  1. Blend the oats with cold water until smooth (no more than 20-30 seconds).
  2. Strain the mixture through a fine mesh sieve, cheesecloth, or nut milk bag.
  3. Serve immediately or store in the fridge for up to 5 days.


* Avoid using quick oats or steel cut oats as this can affect the texture of the milk (quick oats will make the milk too slimy, and steel cut oats will make it not creamy enough).

** It’s technically not zero kg CO2e, but it’s very low. The carbon footprint of a liter of water is 0.000298 kg CO2e.


You can experiment with different ingredients to change the flavor of the milk. I don’t usually drink milk by itself – I use it for either baking or cereal, so it doesn’t bother me if the milk doesn’t have a lot of flavor. 

That being said, if you like to have a sweeter or more flavorful oat milk, you can experiment with honey, maple syrup, dates, vanilla extract, or cashews to get more interesting tasting milk.


This person does an awesome job showing how to make oat milk. She uses cashews, but you can follow this recipe just the same without them.

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