What is the basic choux pastry ratio?

The classic choux ratio is approximately 2:1:1:2 for water:butter:flour:eggs by weight (Michael Ruhlman, Ratio). The base batch in this calculator uses 125ml water, 62g butter, 62g flour, and 2 large eggs — since one UK large egg is roughly 60g shelled, that two-egg total of about 120g gives water 125 : butter 62 : flour 62 : eggs 120, which is close to 2:1:1:2. The key is that the dough must be cooked on the hob first to gelatinise the starch before the eggs are beaten in. This creates the hollow interior when baked.

Why did my choux not puff up?

The most common reasons are: the dough was not cooked enough on the hob (it should pull away from the pan cleanly), the eggs were added when the dough was too hot (which cooks them), or the oven was not hot enough. Choux needs a high initial temperature (200-220 degrees C) to create steam. Also, never open the oven door during the first 20 minutes of baking.

How do I know when to stop adding eggs?

Add the eggs gradually, beating well after each addition. The choux is ready when it drops off a spoon leaving a V-shaped trail, and holds a soft peak. It should be smooth, glossy, and pipe-able. If you add too many eggs the mixture will be too runny and will not hold its shape. Too few and the choux will be heavy and dense.

Can I use milk instead of water for choux?

Yes, using half milk and half water (or all milk) produces a richer, more golden choux with a slightly softer texture. This is particularly good for sweet applications like profiteroles and eclairs. For savoury choux (like gougeres), water alone is fine as it gives a crispier shell.

How do I stop my choux from going soggy?

After baking, pierce the bottom of each choux with a skewer to release the steam inside, then return to the turned-off oven with the door ajar for 5-10 minutes to dry out. Fill as close to serving time as possible. If you need to make them ahead, store unfilled in an airtight container and re-crisp in a 180 degree C oven for 3-4 minutes before filling.

BakeCalcs

Choux Pastry Calculator

Calculate butter, water, flour, and egg quantities for choux pastry by yield.

Item TypeProfiteroles/cream puffs are small (~12 per base batch), eclairs are piped longer (~8 per batch), choux buns are medium (~10 per batch). Yields vary with piped size.

Number to Make

How We Calculate This

This calculator scales the standard choux pastry recipe based on how many items you want to make. The base recipe of 125ml water, 62g butter, 62g flour, 2 large eggs, 1g salt and 5g sugar follows the classic ~2:1:1:2 choux ratio (water:butter:flour:eggs by weight) and makes approximately 12 profiteroles, 8 eclairs, or 10 choux buns. These per-batch yields are approximate and depend heavily on how large you pipe each item.

The calculator adjusts all six ingredients proportionally to your desired yield, so the egg-to-flour ratio that defines choux consistency stays constant. Egg quantities are shown to one decimal place — round to the nearest whole egg when making the dough, then add the final egg gradually and stop when the paste drops off a spoon in a smooth V, since egg sizes vary.

Frequently Asked Questions

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Last updated: February 2026

All calculations are based on standard ratios and conversions. Results may vary with specific ingredients, equipment, and conditions.