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Overnight Oats Calculator

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

Result

120 g
240 ml
24 g

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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Comments (1)

  • Editorial team

    Treat the milk figure as the total liquid for the jar. If you stir in yoghurt, fruit purée or a splash of juice, subtract that volume from the milk amount, otherwise the mix comes out loose. Chia swells as it sits, so a jar that looks thin when mixed will usually thicken in the fridge by morning. Amounts are rounded to whole units, which matters most for one small portion. What milk or add-ins do you use?

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