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Ask experienced home baristas where to spend money and many will give the same answer: on the grinder. A good grinder with a modest machine usually makes better espresso than a great machine with a poor grinder. It sounds backwards, but it comes down to what espresso needs.
Why Espresso Is So Fussy About Grind
An espresso shot pushes hot water through a tightly packed puck of coffee in 25 to 30 seconds. The size of the grounds decides how fast the water gets through. Too coarse and it rushes past, leaving a sour, thin shot. Too fine and it chokes, giving a bitter, harsh one. The window is narrow, so you need to be able to make small changes, and you need the grounds to be even. A mix of dust and boulders extracts unevenly whatever the machine does.
What to Look For
- Burrs, not blades. Blade grinders chop beans unevenly and can’t grind consistently for espresso. Every espresso grinder uses burrs, two cutting surfaces set a precise distance apart.
- Conical or flat. Conical burrs, a cone turning inside a ring, are common in smaller and cheaper grinders. Flat burrs are two parallel rings. The usual view is that conical burrs give more body and flat burrs more clarity, though burr design and size matter as much as shape.
- Burr size. Bigger burrs usually grind faster. Home espresso grinders mostly run from about 40 to 65 mm.
- Adjustment. Stepless grinders let you set any point between two marks. Stepped grinders click between fixed settings, so the steps need to be small enough for espresso.
- Retention. Some grinders hold a few grams of old grounds inside. Single-dose grinders, a category the Niche Zero made popular, are built to pass nearly everything through, so you can weigh in exactly what you want.
Built-In Grinders
Machines like Breville’s Barista Express Impress and Barista Pro put a conical burr grinder inside the machine, with 25 and 30 settings. That’s convenient, it saves counter space, and it’s fine for learning. The limit is the number of steps. If the right setting falls between two of them, you can’t reach it. Our Impress vs Pro comparison covers both machines.
Grinders to Know
Baratza’s Encore ESP is a common starting point for a separate espresso grinder: a compact conical grinder tuned for espresso, with fine steps at the espresso end of its range. Eureka’s Mignon line is the usual step up, with flat burrs and stepless adjustment; the Specialita uses 55mm burrs. At US retailers in September 2026 the Mignons ran from about $300 for the Notte to about $600 for the Specialita. Beyond that sit single-dose grinders with bigger burrs, where prices climb fast. We look closer at the Encore ESP and the DF64, and if you’d rather crank by hand, at hand grinders for espresso.
How to Split Your Budget
A common rule of thumb is to spend about as much on the grinder as on the machine. With a $500 machine like the Bambino Plus or the Gaggia Classic E24, that points to a grinder somewhere in the $300 to $600 range. It feels like a lot for a device that just breaks up beans. It’s also the part of the setup you’ll notice every morning.
For a cortado, grind matters a little less than for a straight shot, because milk softens the rough edges. It still shows. A good grinder is the difference between a cortado that tastes of coffee and one that tastes of warm milk and bitterness.