How to dial in espresso.
A structured workflow that turns the average 8-shot dial-in into a tracked 3–5 shot one — and means the next bag starts from the recipe that worked.
Pick a 1:2 starting recipe (18 g → 36 g, 25–30 s). Pull. Taste. Adjust grind by one notch — finer if sour, coarser if bitter. Repeat 3–5 times. Save the result as the reference shot for that coffee. Next bag, start there.
Why "dial in" exists in the first place
Espresso is the most parameter-sensitive brew method. Tiny changes in grind size or dose translate into large changes in extraction. Every new coffee — even from the same roaster — behaves differently because density, roast level, and process change how the grounds resist water. Dialling in is the process of finding the recipe that makes this coffee taste its best on your machine, this week.
The good news: it's a deterministic process. You can do it on any machine, with any grinder, as long as you isolate variables.
The six steps
1. Pick a starting recipe
Default to a 1:2 ratio. For an 18 g basket (the standard 58 mm modern basket size): 18 g dose in, 36 g espresso out, over 25–30 seconds. This is the safest neutral starting point across light, medium, and dark roasts.
If your basket is a 14 g or 20 g, scale the dose to fit, keeping the 1:2 ratio. Don't try to dial a 21 g dose into an 18 g basket — distribution and headspace will sabotage you.
2. Pull the first shot
- Distribute the grounds evenly (WDT tool, rake, or tap).
- Tamp level. Pressure matters less than levelness.
- Lock the portafilter and start the shot + timer at the same instant.
- Place the cup on a scale. Cut when the scale reads the target yield (36 g for 1:2).
Don't cut on time. Don't cut by eye. Cut on weight. Time becomes a measurement, not a target.
3. Taste honestly
Wait a minute, let the shot cool, and taste. Identify the dominant flaw — not the whole profile, just what's wrong.
| Taste | Diagnosis |
|---|---|
| Sour, sharp, thin, weak finish | Under-extracted |
| Bitter, hollow, dry, harsh finish | Over-extracted |
| Sour and bitter together | Channelling (distribution issue) |
| Watery, fast pour, no crema | Grind much too coarse |
| Choked, drips, almost no flow | Grind much too fine |
| Balanced but uninteresting | Ratio decision, not extraction |
4. Adjust grind, not recipe
Sour? One notch finer. Bitter? One notch coarser. Keep dose and yield identical to the previous shot. The variable you're isolating is grind. Changing two things at once is what turns a 3-shot dial-in into an 8-shot one.
If channelling, fix distribution before touching the grinder.
5. Repeat (and log)
Pull, taste, adjust. Most coffees converge in 3–5 shots. The crucial habit is logging every shot: dose, yield, time, grind setting, taste tag. Without a log, the third shot fixes the second's problem and the fifth shot has drifted because you forgot what worked.
HomeBarista's espresso dial-in tool automates this loop — it shows the progression side-by-side and suggests the next move based on the taste tag.
6. Save the reference
When a shot tastes great, mark it. The recipe gets attached to the coffee bag itself. Next morning — or three weeks from now when you open the same coffee again — the dialled-in recipe is the default. You start at the answer, not from zero.
Common mistakes that double the dial-in time
- Changing dose and grind at the same time. You won't know which one moved the cup.
- Cutting on time instead of weight. Time is a measurement, not a target.
- Trusting "looks right". Crema lies. Weight and taste don't.
- Not letting the grinder settle. If you just adjusted grind, the first few grams are still old setting. Purge or pull and discard the first half.
- Not writing it down. The shot that worked yesterday is lost without the recipe attached to the bag.
When to use a refractometer
Once taste-driven dial-in is automatic, a refractometer adds a feedback loop you can't get from your palate. TDS turns "this tastes balanced" into a number you can compare against the SCA 18–22% extraction target. Read the full TDS and extraction yield guide →
Track every dial-in attempt automatically.
HomeBarista's structured dial-in workflow + reference shots per coffee. Free on iOS.
