When it comes to the ultimate overnight oats recipe, getting the ratio of oats to milk just right is the key.
As a dietitian and an oatmeal lover, I love making overnight oats for busy weeks when I need a convenient breakfast.
After making many bowls of overnight oats, I'm here to share with you the best ratio of oats to milk for overnight oats.
The Perfect Ratio of Oats to Milk for Overnight Oats
Getting the oats-to-milk ratio right is essential for a great bowl of overnight oats.
The ideal ratio is typically 1:1.5, meaning for every ½ cup of rolled oats, you'll need ¾ cup of milk (dairy or non-dairy milk) or water.
Different Types of Milk
The type of liquid you use can vary based on your preference and dietary restrictions. Common choices include cow's milk, almond milk, soy milk, or even Greek yogurt.
Each adds its unique flavor and creaminess to the final result.
You don't have to use milk or dairy products.
Overnight oats can be made with any liquid including water or even coffee in my coffee overnight oats recipe.

Soaking Duration and Storage
Once you've mixed the oats and liquid, it's time to refrigerate them. You can prepare overnight oats in a single serving or make a batch for the entire week.
They need at least 4 hours in the refrigerator to soften, but I prefer leaving them overnight for the best consistency.
Do you stir overnight oats before putting them in the fridge?
Yes, you should stir your overnight oats before refrigerating them which allows the oats to soak evenly in the liquid and helps achieve a consistent texture.
Customizing Your Oats
While the 1:1.5 is generally what people use for overnight oats, you can play around with the ratio for your desired consistency.
If you prefer your oats to be thicker, reduce the milk to a 1:1 ratio.
For a lighter, more liquid consistency, you can opt for a 1:3 ratio.
The best part about overnight oats are the endless flavor combinations.
You can tailor your oats to your liking by adding ingredients such as yogurt, protein powder, nut butter, and fresh fruit.
Here is my guide on creating the best bowl of overnight oats, custom made from your favorite ingredients and toppings.

Benefits of Overnight Oats
I love overnight oats for many reasons. Here are some of the many benefits of overnight oats.

Which is healthier - overnight oats or cooked oats?
Both options can be very healthy, and the healthier choice depends on your specific needs and what you add to your oatmeal.
Oatmeal itself is a highly nutritious grain. In fact, I love it so much that I pretty much eat it every single day in many sweet oatmeal recipes.
How to Make Overnight Oats
Making overnight oats is easy and requires only a few simple ingredients. Here's what you'll need:
- ½ cup rolled oats
- ¾ cup milk of choice or water
- Optional ingredients: chia seeds, yogurt, fruit, nuts, sweeteners
To make overnight oats, simply combine the rolled oats and milk in a jar or container.
Add any optional ingredients you like, such as chia seeds, yogurt, fruit, nuts, or sweeteners.
Stir everything together, cover the jar or container, and refrigerate overnight.
In the morning, your overnight oats will be ready to eat!
Watch me make my favorite blueberry overnight oats

Frequently Asked Questions
How long do overnight oats last in the fridge?
Overnight oats can be stored in the refrigerator for up to 5 days.
This makes them an ideal option for meal prepping your breakfast for the week ahead. Just prepare a batch, and you'll have a quick and nutritious morning meal ready to go each day.
Can I make overnight oats without milk?
Yes, you can make overnight oats without milk. In fact, you can use various alternatives like water, non-dairy milk, such as almond milk or soy milk, or even coffee such as in this coffee overnight oats recipe.
These alternatives offer different flavors and textures, allowing you to customize your overnight oats to suit your preferences and dietary needs.
Can I add protein powder to my overnight oats?
Absolutely, you can add protein powder to your overnight oats, such as in my recipe for blueberry protein overnight oats.
This is a great way to boost the protein content of your breakfast.
Simply mix the protein powder with the oats and your chosen liquid, whether it's milk or a non-dairy alternative, before refrigerating.
Can I make overnight oats with steel-cut oats?
Yes, you can make overnight oats with steel-cut oats.
However, it's important to note that steel-cut oats require a longer soaking time compared to rolled oats.
To achieve the desired texture and consistency, you may need to let them soak for at least 8 hours or overnight.
Can I eat overnight oats cold?
Yes, you can certainly eat overnight oats cold.
They are delicious straight from the fridge, which makes them perfect for a summer breakfast.
However, if you prefer them warm, you can heat them in the microwave or on the stove.
Can I add fruit to my overnight oats?
Yes!
I love adding bananas for creaminess, berries, and apples for a crisp texture.
Feel free to experiment with different fruits to find your favorite combination.
Can I add nuts to my overnight oats?
Certainly, you can add nuts to your overnight oats.
Nuts not only provide a crunch but also increase the nutritional value of your breakfast. Almonds, walnuts, and pecans are popular choices that bring a wonderful nutty flavor and added protein and healthy fats to your morning meal.
Should you rinse oats for overnight oats?
There's no need to rinse oats for overnight oats.
Simply measure out the desired amount of oats and combine them with your chosen liquid, and they'll soften as they soak.
Rinsing is unnecessary in this method, as the oats will absorb the liquid gradually, resulting in the perfect consistency for your overnight oats.
More Expert Advice on Oatmeal
- Can You Eat Uncooked Oatmeal in a Smoothie – Dietitian Reviews
- Is Oatmeal Better With Milk or Water? Tips For The Best Oatmeal
- Can You Eat Uncooked Oatmeal in a Smoothie – Dietitian Reviews
- Can Oatmeal Cause Gas? Oatmeal and Digestive Health
- Is It Okay to Eat Oatmeal at Night? Foods for a Restful Sleep
- Is Instant Oatmeal Good for Diarrhea?
- Oatmeal Pros and Cons – Dietitian Reviews
- Benefits of Overnight Oats vs Cooked
- What is Blended Oatmeal
- How Long Can Oatmeal Sit Out: A Comprehensive Guide
- Can I Reheat Oatmeal? A Guide to Leftover Oatmeal
- The Ultimate Guide to Perfectly Thickened Oatmeal
- The Perfect Ratio Oats to Milk for Overnight Oats
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