Grind Size for Medium Roast Espresso (2026)

What grind size should you start with for medium roast espresso?

Start in your grinder’s fine espresso range, then use the shot’s speed and flavor to choose the exact setting. Medium roast is a helpful description, not a grinder number. A fine setting on one grinder can be wildly different on another, so use a measured recipe instead of chasing somebody else’s dial.

Counter Culture Coffee’s grind-size guide explains why espresso needs fine grounds: water has very little time to pull flavor out. Bean density, processing, freshness, basket size, burr geometry, machine pressure, and your own taste can all change how the puck behaves.

What do you need to dial in a medium roast?

You need fresh medium-roast beans, an espresso-capable burr grinder, a scale, and a timer. The scale matters most. It lets you repeat a good shot instead of remembering that it looked about right while coffee is splashing into the cup.

• Medium-roast beans: Keep the same bag for your first few shots.
• Burr grinder: Choose one with a usable espresso range and repeatable adjustments rather than a blade grinder. See our burr grinder picks under $200 if yours cannot make a fine, repeatable grind.
• Scale and timer: Measure both coffee in and espresso out.
• Espresso machine and basket: Use the same basket each time you compare shots.

How do you dial in medium-roast espresso step by step?

Set one simple recipe, pull a measured shot, and change only the grind until the flow is close. Keep dose, yield, water temperature, and puck preparation the same. That is how you learn what one adjustment actually did, rather than guessing among several changes.

Step 1: Set an 18g to 36g starting recipe

Weigh 18g of beans into your usual basket and place your cup on the scale. Stop the shot at 36g of espresso, which is a 1:2 brew ratio. La Marzocco Home’s guide to espresso brew ratios uses this 18g-to-36g example and places espresso roughly in a 25–35 second window.

For a tighter first target, aim for about 25–30 seconds. Coffee Gear Hub’s published dial-in guide uses the same 18g, 36g, and 25–30 second starting recipe. It is a reference point, not a promise from your machine.

Step 2: Grind fine and write down the setting

Choose a fine setting in your grinder’s espresso range, grind the dose, then level and tamp it the same way each time. Write down the setting before you pull the shot. Grinder numbers are machine-specific, so “12” is useful only if it is your own grinder’s 12.

A controllable burr grinder makes small changes far less frustrating than a blade grinder. If you prefer a manual routine and want fine, repeatable adjustments, browse our hand-grinder picks for espresso under $100. If your current grinder has no usable espresso range or produces inconsistent grounds, our espresso burr-grinder guide is the sensible next stop.

Step 3: Pull the shot and read the cup

Start the timer with the pump and watch the scale. A shot that races to 36g well before 25 seconds is too fast. If it tastes sharp, thin, or lemony, go finer next time. A shot that drips slowly past 30 seconds may taste dry, bitter, or heavy, so go coarser.

Step 4: Move one step, then keep the winning notes

Make one small grind change, then pull the exact same recipe again. Do not change dose, temperature, and yield at the same time or the answer gets muddy. Once flow is close, you can adjust yield or temperature in small increments to shape the flavor, keeping notes so the result is repeatable.

Aldo’s Coffee Company’s grind guide suggests medium roasts may start a touch finer than dark roasts. Treat that as a starting nudge, not a law. Your coffee gets the final vote.

What mistakes make medium-roast espresso harder to dial in?

The biggest mistake is changing several things after one disappointing shot. A fast shot can reflect grind, dose, yield, or uneven puck preparation. Hold the recipe steady and let each adjustment give you a clean answer, rather than trying to diagnose several moving targets at once.

• Copying a dial number: Another grinder’s setting is not your setting. Record your own.
• Eyeballing the yield: A scale catches a short or long shot that your eyes will miss.
• Judging by crema alone: Taste the shot after it cools for a moment. Crema can look lovely on a sour espresso.

What should you change when the shot tastes wrong?

Start with the symptom, then make the smallest useful move. Sour and fast points toward a finer grind; bitter and slow points toward a coarser grind. If timing is already close, keep the grind where it is and use a small yield or temperature change to shape the cup.

The shot is sour and runs fast

Grind a little finer and pull the same 18g-to-36g recipe again. If it is still sour with sensible timing, check whether the yield was cut short, the grounds were unevenly loaded, or the beans are very fresh. Do not leap to a much finer setting in one go.

The shot is bitter and runs slow

Grind a little coarser, then keep your dose and yield fixed. If the flow improves but the cup stays harsh, shorten the yield slightly after the grind is close. A slow shot can taste pleasantly intense, or unpleasantly dry, so let the cup rather than the timer settle the final adjustment.

The shot looks uneven or sputters

Break up clumps, level the grounds, and tamp straight before changing the grinder. Uneven water flow through the coffee puck can make a shot taste both sour and bitter. The grind cannot fix uneven puck preparation on its own.

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