What Grind Size Do You Need for Espresso?
Updated
Espresso needs a grind about the texture of fine table salt — noticeably finer than drip, coarser than powder. There is no universal setting number: the correct fineness changes with the bean, the roast date, the humidity and the machine, which is why espresso grinders have so many steps and why you dial in by time rather than by a number.
Why nobody can give you a number
Grinder settings are not standardised. Step 12 on one grinder is nothing like step 12 on another, and even two units of the same model differ because burrs are aligned individually. Any guide that gives you a setting number is describing their grinder, not yours.
What is standard is the target: roughly double your dose in liquid, in 25 to 30 seconds. Grind to hit that, and the number on the dial is whatever it happens to be.
What changes the right setting
Roast level. Darker roasts are more brittle and grind finer at the same setting, so they usually need a coarser dial than a light roast.
Roast date. Fresh coffee degasses and resists flow; the same setting gets faster as the bag ages, so you creep finer over a fortnight.
Humidity. Damp air makes grounds clump, which raises resistance. It is a real effect and it is why a setting can seem wrong on one morning only.
Basket size. An 18 g basket at 18 g behaves differently from a 14 g basket at 14 g, because bed depth changes.
Stepped versus stepless
Stepped grinders click between fixed positions, which is easy to repeat and occasionally frustrating when the right setting is between two clicks. Stepless grinders adjust continuously and let you land exactly, at the cost of being harder to return to a known point.
For espresso specifically, more steps in the espresso range matters far more than the total number of settings. A grinder with 40 settings of which 6 are usable for espresso is worse than one with 15 that are all in range.
Related on espresso.compare
Frequently asked
- What grind size is best for espresso?
- About the texture of fine table salt. There is no transferable setting number because grinders are not calibrated to a common scale — dial in by shot time instead.
- Can I use a blade grinder for espresso?
- No. A blade grinder chops rather than grinds, producing wildly uneven particle sizes that channel under pressure. A burr grinder is a requirement, not a preference.
- Why does my grind setting keep changing?
- Coffee ages and degasses, so resistance falls over the life of a bag. Drifting one or two steps finer across a fortnight is normal.
- How many grind settings do I need?
- What matters is how many fall inside the espresso range, not the headline count. Machines with 25–30 settings usually give enough resolution to land a shot precisely.