Here is how to dial in espresso: fix your dose (say 18 g) and target yield (say 36 g), pull a shot, taste it, and then change grind size only: finer if it’s sour and fast, coarser if it’s bitter and slow. Repeat until the shot tastes balanced, then fine-tune yield and temperature. Change one variable per shot and write down what you did.
Your grinder does most of the work here. A grinder that adjusts in small steps makes dialing in faster and more precise; if yours can’t get fine enough or jumps too much between settings, see our best espresso grinders for home baristas.
Table of Contents
What “dialing in” means
Dialing in is the process of finding the recipe (dose, yield, time, temperature) that makes a particular coffee taste its best on your equipment. You redo it whenever you open a new bag, and make small corrections as beans age over a couple of weeks. It typically takes 2–5 shots for a new coffee once you know the process.
Before you learn how to dial in espresso
- Scale with 0.1 g readability and a timer. You can’t dial in reliably without one. See best espresso scales.
- Fresh beans, roughly 5–30 days off roast. Very fresh beans gas a lot and run unpredictably.
- Consistent puck prep: same distribution, same tamp, every shot. Our how to make espresso at home guide covers the full workflow.
- A fully heated machine. Your first shot of the day on a cold machine is not a fair test.
- A notepad or phone notes to record dose, yield, time, grind setting and taste.
Step 1: Choose your dose
Use the dose your basket is designed for. Most standard double baskets take 18 g; 54 mm Breville baskets take around 18–19 g; 51 mm baskets usually 14–16 g. A quick check: after tamping, there should be a few millimeters of space between the puck and the shower screen. If the screen leaves an imprint on the puck, reduce the dose by 0.5–1 g.
Once chosen, keep the dose fixed for the whole dial-in.
Step 2: Set a target ratio and time
Start with a 1:2 ratio (18 g in, 36 g out) aiming for 25–30 seconds from pressing brew. That’s a reliable starting point for medium roasts. Adjust the starting point for your roast:
| Roast | Starting ratio | Starting temperature |
|---|---|---|
| Dark | 1:1.5 to 1:2 | 88–91°C (190–196°F) |
| Medium | 1:2 | 92–94°C (198–201°F) |
| Light | 1:2 to 1:2.5 | 94–96°C (201–205°F) |
Why these ratios work is explained in our espresso brew ratio guide.
Step 3: Pull your first shot
Grind at a sensible starting point (the middle of your grinder’s espresso range, or the setting you used for your last similar coffee). Prep, brew, and stop at your target yield. Note the time.
Step 4: Taste, then adjust grind
Stir the shot and taste it. Taste is the final judge, but time tells you which direction to go.
| What you see and taste | What’s happening | Adjustment |
|---|---|---|
| Under 20 s, sour, salty, thin, watery | Under-extracted | Grind finer, noticeably |
| 20–25 s, a bit sharp or sour | Slightly under-extracted | Grind a little finer |
| 25–32 s, balanced: sweet, some acidity, pleasant bitterness | In range | Move to step 5 |
| 32–40 s, bitter, harsh, dry finish | Over-extracted | Grind a little coarser |
| Over 40 s, drips only, very bitter or burnt | Choked | Grind noticeably coarser |
A tricky case: a shot that tastes both sour and bitter usually means channeling, not a grind problem. Improve distribution with a WDT tool and level tamping before changing grind. Our accessories guide covers the tools.
How big should a grind change be?
On stepped grinders, go one step at a time. On stepless or micro-adjustable grinders, a small nudge often changes shot time by 3–5 seconds. As a rule of thumb, grinding finer slows the shot; if one step moves time by more than 10 seconds, your grinder’s steps are coarse and you’ll need to fine-tune with dose or yield instead.
Purge after every grind change
Many grinders retain a little coffee from the previous setting. After adjusting, grind and discard 1–2 g (or weigh output from a single-dose grinder) so your next shot actually uses the new setting.
Step 5: Fine-tune with yield
Once time and taste are roughly in range, use yield to fine-tune strength and balance, leaving grind alone:
- Balanced but too strong or heavy: increase yield by 2–4 g (e.g. 36 g → 40 g).
- Balanced but thin or weak: decrease yield by 2–4 g (e.g. 36 g → 32 g).
- Slightly sour at the end of the sip: increase yield slightly; a longer shot extracts more.
- Slightly bitter or drying: decrease yield slightly.
Step 6: Adjust temperature (if your machine allows)
Temperature is the last lever. Raise it by 1–2°C (2–4°F) if a shot still tastes sour or flat after grind and yield are right, especially with light roasts. Lower it if a dark roast tastes ashy or harsh. Machines without temperature control can still be helped by a full warm-up and a pre-heated cup.
Step 7: Record the recipe
Write down dose, yield, time, grind setting and temperature, plus a short taste note. When you buy the same coffee again, you’ll be within a shot or two of perfect. As the bag ages over 2–4 weeks, you’ll usually need to grind slightly finer to keep the same time.
A worked example of how to dial in espresso
- Shot 1: 18 g in, 36 g out, 19 s. Sour and thin. Grind finer by 2 steps.
- Shot 2: 18 g in, 36 g out, 26 s. Better, slight sharpness. Grind finer by 1 step.
- Shot 3: 18 g in, 36 g out, 30 s. Sweet and balanced, a bit intense in milk-free sips.
- Shot 4: 18 g in, 40 g out, 32 s. Balanced and a little lighter. Recipe recorded.
This example is an illustration of the process, not a recipe for any particular coffee.
When you can’t dial in
- Shot runs fast even at the finest setting: your beans may be stale, or the grinder can’t go fine enough. Try fresher coffee, a smaller dose, or a better grinder; budget options are in our best budget espresso grinders guide.
- Shot times vary wildly with the same settings: inconsistent puck prep or channeling. Use WDT and a level tamp.
- Everything tastes bitter regardless: clean the machine, check the beans aren’t very dark and old, and lower temperature.
- Using pressurized baskets: these mask grind changes. Dial-in matters most with single-wall baskets.
Once you know how to dial in espresso and want the background on why grind size changes flow so much, the overview of espresso on Wikipedia covers the basics of extraction.
FAQ
How many shots does it take to dial in espresso?
Usually 2–5 shots for a new coffee once you’re comfortable with the process. Your first few bags may take more.
Should I change dose or grind first?
Grind first. Pick a dose that suits your basket, keep it fixed, and use grind as the main adjustment. Change dose only if the basket is overfilled or underfilled or your grinder’s steps are too coarse.
Does shot time matter if the espresso tastes good?
No. Time is a guide that helps you diagnose problems. If a 22-second or 38-second shot tastes great, keep it.
Why does my espresso change from day to day?
Beans age and lose gas, room humidity changes, and machines heat differently. Small daily grind adjustments are normal.
Do I need to dial in again for every new bag?
Yes, even the same coffee from a new roast batch can need a small change. Your notes from last time give you a head start.
Is a better grinder or a better machine more important for dialing in?
The grinder. Fine, even, adjustable grinding gives you control; a better machine helps mostly with temperature stability and milk.
