How to make oat milk (that only costs 15p a litre)

A few years ago it became clear I was dairy intolerant. I’d eat ice-cream, cheese and cakes smothered in buttercream, and get a bad stomach – but it wouldn’t cross my mind that I should stop, or that something was wrong. Just kept shoving it in like a genius! So I started drinking oat milk instead of cow’s milk as that is a really easy change.

I used to like the brand Oatly, which costs around £1.50 – £2 a litre, but with this “recipe'” (it’s pretty funny calling it a recipe because it’s two ingredients, but really, is water actually an ingredient?), you can make pretty much a litre for 15p.

Honestly, if you buy and drink cow milk alternatives, this is going to save you a fortune.

Oh, takes two minutes without a blender and seconds if you have one.

What do you need to make oat milk?

Right, you ready for complicated?

  • 1 cup of rolled oats (you know the cheap type, where 1KG is about £1
  • 4 cups of water
  • If you want it sweetened, shove something a bit sweet in it to taste. Sugar works!

I know ‘cups’ is a really American term, so use whatever really. As long as there’s a 1 to 4 ratio, it’s going to taste nice.


  • In an ideal world, you’ll have a blender
  • If not, a bowl and something to bash the oats with. I used a meat tenderiser but literally anything heavy and long will do!
  • Something to strain the milk from the oats – so muslin cloth is best because you can really squeeze it out but a sieve works too.

How to make oat milk at home

If you have a blender, just stick all the ingredients in there and blitz, but I’m not fancy – so I have to do it the old fashioned way.

  1. Get your oats, put one cup in a bowl and then add 4 cups of water
  2. Bash it about a bit with something. You want to break up the oats.
  3. Then get a jug, put muslin over the top and pour in the oat milk.
  4. Voila! You have oat milk.

If you have any ideas to use up the old oats (shove in a smoothie?), let me know. I hate waste.

How much does oat milk cost to make at home?

I made my boyfriend do the maths for this because this is a very serious blog and if you leave maths up to me, I’ll just make up a number and hope you never check!

Anyway, he measured how much a cup of oats weighs, and long story short, the 1kg bag of rolled oats we had cost £1, and the cup was 15ps worth.

So that’s it really. It doesn’t get cheaper or easier than this. Let me know if you try it out.

UPDATE: Someone in my Twitter mentions has made a good point. If you are drinking oat milk as part of a vegan lifestyle, be wary that the stuff in shops might be fortified with the vitamin B12. Just worth noting so you can replace it elsewhere.

I don’t do recipes often, but if you want the recipe to my favourite cake of all time – check it out.

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  1. Mathsy April 12, 2020
  2. GB April 12, 2020

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