Grind medium-roast coffee fine, right in the middle of the espresso range, then tune it by taste and flow. That setting is finer than the same beans need for a dark roast. At the light end of the spectrum, beans want an even finer setting than this.
James Hoffmann, a World Barista Champion, frames the target simply. Aim for a grind with enough puck resistance to pull roughly 25 to 30 seconds at a 1:2 ratio. His advice for anyone coming from dark roasts: grind finer than feels natural. Those beans broke down less in the roaster, and water passes through them more easily.
The Best Starting Grind For A Medium Roast
Start at a fine espresso setting that looks and feels close to table sugar, or slightly finer. A medium roast forgives more than a light one, but it still needs true espresso fineness to build resistance.
No universal dial number exists that transfers between grinders, so do not hunt for one. Espresso names the brew method, not the roast, so the correct grind is whatever your machine turns into a healthy shot.
The espresso grind size guide from Perfect Daily Grind covers that fine range in depth and explains adjusting it for extraction. The Coffee Compass dialing guide points the same way: start fine in the espresso range, then let flow and taste decide each move.
Your basket matters too. Pressurized, dual-wall baskets create resistance themselves, so they forgive a coarser setting, while standard single-wall baskets rely on the grind alone.
A burr grinder with espresso-range settings can hold a fine position repeatably, while a blade grinder cannot. One espresso-focused choice is the Baratza Encore ESP.
- Burrs: 40 mm steel conical
- Adjustment: 40 stepped settings
- Built for: espresso-first home use
With the starting point set, the next job is turning shot feedback into small, smart adjustments.
Dialing In, Step By Step
Dialing in means making one small grind change per shot until the drink balances sweetness, gentle acidity, and body. Think of extraction as how much flavor the water pulls out, with the grind controlling that amount directly.
- Purge after every change. Run the grinder and toss the first grounds out, since stale grounds hiding inside will pollute the new dose.
- Brew by mass on a 0.1 g coffee scale, not by volume, because crema makes liquid levels misleading.
- Fix the recipe. Hold the dose at 18 g and stop the shot between 36 g and 40 g out, a 1:2-style brew ratio for a double.
- Time each shot from the moment the pump engages, and write the seconds next to the ending weight.
- Taste it fresh and name exactly one issue: sour, bitter, or a muddy mix of both.
Barista Hustle takes the tuning further: lock dose and yield first, then let grind size steer the extraction. Grinding finer expands surface area and stretches contact time; going coarser shortens both.
Meanwhile, freeze everything outside the grind: dose, target yield, and water temperature. Medium roasts commonly settle near 198-201°F (92-94°C) on machines that adjust.
With the procedure set, the next skill is decoding the shot itself.
Reading The Shot And Choosing The Fix
Read two signals together, the taste and the clock, before deciding any direction. Sour leans one way, bitter the other, and mixed flavors usually mean neither fix applies.
Use the table below to decide whether to grind finer or coarser.
| What You Taste Or See | Flow And Time | Likely Cause | Your Move |
| Sour, sharp, thin body, salty edge | Runs fast, well under target time | Can indicate under-extraction | Grind finer in a small step |
| Bitter, harsh, ashy, drying feel | Drags slow, past the target range | Can indicate over-extraction | Grind coarser in a small step |
| Barely any liquid at all | Stalled, dripping only | Puck choked, packed too tight | Step coarser until flow returns |
| Sour and bitter at once, uneven or spurting streams | Erratic timing | Can indicate channeling in the puck | Keep the grind, fix distribution first |
| Sweet, rounded acidity, full balanced body | Steady, roughly 25-30 seconds | Properly extracted | Change nothing, write the setting down |
Mixed bitter-sour cups form the trap, because they usually suggest channeling rather than a wrong grind size. Going finer in that moment often digs the channels deeper instead.
A bottomless portafilter exposes the problem live by showing every stream leaving the basket. When streams wander sideways or spit, the water found a preferred path through the grounds.
When taste stays crooked while the shot looks straight, look at the puck prep before the dial.
Puck Prep That Makes A Fine Grind Behave
Fine espresso grounds arrive in clumps, and clumps wreck the packed symmetry inside the basket. That uneven bed opens water highways, which is exactly the channeling described above.
Grinding a medium roast produces a spread of particle sizes, from boulders down to dust called fines. Scott Rao’s espresso writing explains that those fines normally pack the gaps left between bigger particles.
Ground too fine or poorly mixed, the fines drift toward the basket holes and clump there. That clustering lets water race through one spot while the rest of the puck stays under-rinsed.
The everyday countermeasure is a WDT distribution tool, a handle with needle-thin prongs. Sweep the bed gently right after dosing, and clumps break apart before tamping begins.
Rao treats that kind of deep distribution as required practice for getting away with very fine espresso grinding. Afterwards, tamp every shot flat, level, and with the same steady pressure, since grind changes only mean something on an identical bed.
Once each puck mirrors the last one, every grind tweak finally shows its true effect.
Why The Roast Level Sets The Fineness
Roast level decides how much resistance the bean itself gives the water. More roasting means more breakdown, which is why the settings shift across the espresso range.
Rao notes that roasting into medium territory leaves the cell structure more porous but still intact compared with darker roasts. Hoffmann puts it bluntly: coming from a dark roast, you must grind a medium finer than you expect, because water moves through it more easily.
Light roasts sit at the hardest, least soluble end, so they push even further toward fine settings. Your medium roast enjoys the friendlier middle, demanding real fineness without punishing you for it.
The same beans take far coarser settings for gentler brew styles like brewing in a drip machine or making AeroPress coffee. Longer contact time in those methods replaces the pressure that espresso relies on.
Start fine: roughly table-sugar texture at the middle of your espresso range. Adjust one small step at a time, guided by taste, until a 1:2 shot runs near 25 to 30 seconds. Then leave the dial alone, log your recipe, and enjoy the cup you earned.