Oatmeal to Water Ratio Calculator
This free oatmeal to water ratio calculator tells you exactly how much liquid your oats need. Enter the oats in cups or grams, pick what you are making, and get the water or milk to match. It covers rolled oats on the stovetop or in the microwave, steel cut oats, overnight oats and homemade oat milk, with a thicker or thinner setting. Nothing is uploaded and there is no account.
Oatmeal to water ratio for each kind of oats
Pick the style under What are you making? and the calculator applies the base ratio below, by volume. The answer updates as soon as you change anything.
| Style | Oats : liquid | 1 cup of oats needs |
|---|---|---|
| Stovetop / Microwave (rolled oats) | 1 : 2 | 2 cups |
| Steel Cut | 1 : 3 | 3 cups |
| Overnight Oats | 1 : 1 | 1 cup |
| Oat Milk | 1 : 4 | 4 cups |
Oatmeal to water ratio in grams
Switch the unit to Grams to work by weight, which is the most repeatable way to measure. The calculator uses 90 g per cup for rolled oats and 160 g per cup for steel cut oats, and 240 ml per cup of liquid, then gives the answer in millilitres. For example, 50 g of rolled oats on the stovetop needs about 267 ml. Your cups and grams entries are kept separately, so flipping between them never loses what you typed.
How to make oatmeal thicker or thinner
Drag the Consistency slider. Standard is the base ratio. Thick uses 0.85 times the liquid, so 1 cup of rolled oats takes 1¾ cups of water instead of 2. Thin uses 1.15 times, which comes to 2¼ cups. Cup results are rounded to the nearest eighth of a cup and shown as a fraction you can find on a measuring set.
Overnight oats and oat milk ratios
Overnight oats soak at 1 part oats to 1 part milk or other liquid, so 1 cup of oats goes with 1 cup of milk. Homemade oat milk is 1 part oats to 4 parts water, blended and strained. Choose Overnight Oats or Oat Milk and enter the oats you have. The calculator does not cover pressure cookers, rice cookers or slow cookers, which cook differently from the stovetop.
Frequently asked questions
What is the oatmeal to water ratio?
For standard rolled oats the ratio is 1 part oats to 2 parts water by volume, so 1 cup of oats takes 2 cups of water. Use less for thicker oatmeal and more for thinner; the consistency slider does that for you.
How much water for 1 cup of oats?
For 1 cup of rolled oats cooked on the stovetop or in the microwave, use 2 cups of water. For 1 cup of steel cut oats use 3 cups, and for overnight oats use 1 cup of milk or liquid.
What is the steel cut oats to water ratio?
Steel cut oats take 1 part oats to 3 parts liquid by volume, so 1 cup of oats needs 3 cups of water. They are denser than rolled oats, which is why the calculator treats a cup of them as 160 grams.
What is the oatmeal to water ratio in grams?
Enter the weight of your oats in grams and the calculator returns millilitres of liquid. It treats 1 cup of rolled oats as 90 grams and 1 cup of steel cut oats as 160 grams, so 50 g of rolled oats on the stovetop needs about 267 ml of water.
What is the oatmeal to water ratio for the microwave?
Microwave oatmeal uses the same 1 to 2 ratio as the stovetop: 1 cup of rolled oats to 2 cups of water. Choose Stovetop / Microwave and the calculator applies it, then use a large bowl because it bubbles up as it cooks.
What is the overnight oats ratio of oats to liquid?
The basic overnight oats ratio is 1 part oats to 1 part liquid by volume, so 1 cup of oats soaks in 1 cup of milk. Slide to Thin if you like it looser or Thick for a firmer, spoonable jar.
What is the oats to water ratio for oat milk?
Homemade oat milk uses 1 part oats to 4 parts water by volume, so 1 cup of oats blends with 4 cups of water. Pick Oat Milk and it works out the water for the oats you have.
How many grams is 1 cup of rolled oats?
About 90 grams. A cup of steel cut oats is heavier at about 160 grams. Cup weights vary a little with how the oats are packed, so use grams when you want a repeatable result.
How do I make oatmeal thicker or thinner?
Use less liquid for thicker oatmeal and more for thinner. The consistency slider changes the liquid by 15 percent: Thick uses 0.85 times the standard amount and Thin uses 1.15 times.
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Ninja Nutri-Plus Personal BlenderBlend your own oat milk, or whizz overnight oats smooth.
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