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Overnight Oats Calculator

Scale a perfect overnight oats recipe to any number of servings — oats, milk, and chia.

How it is calculated

The tool scales three ingredients from the number of servings and the oats per serving: oats = servings × oats_per, milk = oats × 2, chia = oats × 0.2. Oats and chia are in grams, milk is in millilitres. So the base recipe is 1 part oats to 2 parts milk by weight-to-millilitre, and chia is one fifth of the oat weight. If the oats-per-serving field is left empty or is zero or negative, the tool uses 50 g per serving. Servings must be above zero, and fractions such as 1.5 work. All amounts are rounded to whole grams or millilitres. Fixed ratios mean a thicker or looser bowl needs a manual adjustment of the milk.

Worked example

Make 3 servings with 40 g of oats each. Oats: 3 × 40 = 120 g. Milk: 120 × 2 = 240 ml. Chia: 120 × 0.2 = 24 g. Mix the three in a jar or jars, split between three portions, and refrigerate overnight. With the default of 50 g per serving the same three portions would need 150 g of oats, 300 ml of milk and 30 g of chia.

Try this example →

Common mistakes

  • Entering the total oats in the per-serving field. The field is grams per portion, so 150 there for three servings gives 450 g of oats.
  • Expecting equal volumes of oats and milk. The tool uses twice as many millilitres of milk as grams of oats, which is a looser mix than a cup of oats to a cup of milk.
  • Measuring oats by the cup or spoon instead of weighing them. Rolled oats vary in density, so 50 g is not a fixed number of spoonfuls.
  • Leaving out the chia when scaling up, even though it is 20% of the oat weight and is what thickens the mix.
  • Adding the fruit, yoghurt or sweetener from the original recipe on top without reducing the milk, which makes the result runny.

About this calculator

This calculator scales a classic overnight oats recipe — rolled oats, milk (or a milk alternative), and chia seeds — to any number of servings. It starts from 50 g of rolled oats per serving (you can change this), adds 2 ml of milk for every 1 g of oats and chia seeds at about 20% of the oat weight (10 g of chia for 50 g of oats). The chia seeds matter for texture as much as nutrition: they absorb roughly ten times their weight in liquid overnight, which is what thickens the mixture from a runny bowl of oats into the classic pudding-like consistency without any cooking.

Home cooks meal-prepping breakfasts for the week and anyone scaling a recipe up for a group brunch use this to avoid the guesswork of resizing ratios by hand, since getting the oats-to-liquid ratio even slightly wrong is the most common reason overnight oats turn out too soupy or too stiff.

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