Espresso Ratios: A Dial-In Guide for Balanced Shots

Dialling in espresso means finding the grind setting that delivers your target yield in your target time. Everything else follows from that.

The three numbers

Dose — dry coffee in the basket, typically 18-20g for a double.

Yield — liquid espresso out, by weight not volume.

Time — from pump start to stopping the shot.

Ratios are expressed dose to yield: 18g in, 36g out is 1:2.

The conventional targets

Start at 1:2 in 25-30 seconds. That is a reference point to move from, not a rule.

Change grind, not time

This is the single most useful principle and the one most often violated.

Time is an output, not an input. You cannot set a shot to run for 28 seconds; you set a grind, and the time is what results.

If the shot runs fast, grind finer. If it chokes, grind coarser. Adjust one step at a time and pull again.

Changing dose and grind together tells you nothing, because you cannot attribute the difference.

Reading the taste

That last row matters. Tasting both faults at once is not a grind problem — it means water found a path through the puck and over-extracted along it while under-extracting elsewhere.

Distribution before tamping

Most channelling originates before the tamp. Break up clumps, level the bed, and tamp straight rather than hard. Consistency of pressure matters more than force.

Roast affects the target

Lighter roasts are denser and less soluble, and often want a longer ratio and a finer grind. Darker roasts are more soluble and can turn bitter at ratios a light roast would need.

If you switch coffees and everything tastes wrong at your usual setting, that is expected. Re-dial rather than concluding the coffee is bad.