The brew ratio is the weight of coffee in against the weight of liquid espresso out. It is written as a ratio, and it is the single most useful number for making shots repeatable.
Start at 1:2. Eighteen grams of coffee producing thirty-six grams of espresso, in roughly 25 to 32 seconds. That is the modern default and it suits the overwhelming majority of beans.
Note that the yield is measured by weight, not volume. Crema is mostly foam and its volume varies enormously, so a “double shot” measured by eye is not repeatable. Put the cup on a scale.
Moving the ratio deliberately
- Ristretto, around 1:1.5 — 18 g in, 27 g out. Less water through the same coffee gives a thicker, sweeter, more concentrated shot with less of the finish. Good with dark roasts and in milk.
- Normale, 1:2 — the default. Balanced.
- Lungo, 1:3 or beyond — 18 g in, 54 g out. Lighter, more aromatic, and further into extraction, so it risks bitterness with anything but a light roast.
What the ratio does not fix
Ratio and grind do different jobs, and confusing them is why people go round in circles. Grind size controls how fast water moves and therefore how much gets extracted. Ratio controls how concentrated the result is.
A sour shot at 1:2 is under-extracted — grind finer. Extending to 1:2.5 will make it less sour by pulling more out, but it will also thin the body. Fix the grind first, then use the ratio to fine-tune.
Keep the dose and the ratio fixed while you dial in. That is what turns three test shots into an answer rather than a guess.
Questions people actually ask
Does the ratio change for milk drinks?
Often, yes. A slightly tighter ratio — around 1:1.5 to 1:1.8 — gives a more concentrated shot that survives being diluted by 150 ml of milk. At 1:2.5 a flat white can taste washed out.
What ratio for a single basket?
The same ratio, scaled: 9 g in, 18 g out. Singles are harder to pull well because the shallow bed channels more easily, which is why most people use a double basket even for one drink.
Last reviewed 8 August 2026