Guide
Espresso Grind Size: How to Dial In the Perfect Shot
Grind size is the single biggest lever you have over espresso. Here is how to dial it in without wasting a bag of beans.
Why grind matters most
Espresso is brewed under pressure, so how finely you grind controls how fast water pushes through the puck — and therefore how the shot tastes. Get the grind right and an average machine makes great coffee; get it wrong and the best machine in the world pulls a bad shot.
Aim for a target
A solid starting point — then adjust to taste:
- Dose: about 18g of coffee in
- Yield: about 36g out (a 1:2 ratio)
- Time: 25–30 seconds, including pre-infusion
- Always use a scale and a timer — your eyes lie, the numbers do not
Reading the shot
- Pouring too fast — gushing, pale, under ~20s → grind FINER
- Pouring too slow — dripping, choking, over ~35s → grind COARSER
- Taste check: too coarse tends to sour and thin; too fine tends to bitter and harsh
Adjust in small steps
- Change the grind one or two notches at a time, then pull a fresh shot
- Change only ONE variable at a time (keep dose and ratio fixed) so you know what did what
- Use fresh beans and a capable espresso grinder — stale coffee and a weak grinder make dialing in feel impossible
Watch it done
FAQ
My espresso pours too fast — finer or coarser?
Go finer. A fast, pale, gushing shot means water is finding it too easy — a finer grind slows it down and builds proper extraction.
What is a good espresso shot time?
Roughly 25–30 seconds to pull about a 1:2 ratio (e.g. 18g in, ~36g out), including pre-infusion. Use it as a starting target, then adjust to taste.
Why can't I dial in my grind?
Usually stale beans or a grinder that can't grind fine and consistently enough for espresso. Fresh beans and a capable espresso grinder make dialing in far easier.
Recommended gear
Putting this into practice? Browse our espresso machine reviews and grinder reviews — or start with the Breville Barista Express, our pick for most home baristas.