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To dial in espresso, fix your dose (for example 18 g), pick a target yield (about 36 g, a 1:2 ratio), and adjust the grind until the shot runs in roughly 25–30 seconds. Then taste: if it's sour, extract more (grind finer or run a little longer); if it's bitter, extract less (grind coarser or stop earlier). Change one thing per shot and note what you did.
That's the whole method. The rest of this guide explains each step, gives you a table for diagnosing shots, and includes an interactive helper that turns your dose, yield, time and taste into the next adjustment.
Espresso dial-in helper
Enter your dose, yield and shot time, choose the shot style and how it tasted, and the helper shows your ratio and flow and suggests one change for the next shot.
Espresso dial-in helper
Change one thing at a time, pull another shot and compare. Grind size moves the shot time; yield moves the ratio; taste has the final say.
Sources: the 25 ± 5 second window and 7 ± 0.5 g single dose come from the Istituto Nazionale Espresso Italiano (INEI) specification for certified Italian espresso. The 25–30 second target and the 1:2 normale ratio are common specialty-coffee starting points, not a formal standard.
The 25 ± 5 second window comes from the Istituto Nazionale Espresso Italiano (INEI) specification for certified Italian espresso. The 25–30 second target and the 1:2 "normale" ratio are common specialty-coffee starting points, not a formal standard.
What "dialing in" means
Dialing in is finding the grind setting and recipe that make a coffee taste its best on your machine. You do it every time you open a new bag of beans, and you touch it up as beans age, because older beans usually need a slightly finer grind.
Three numbers define a shot:
- Dose: the weight of ground coffee in the basket.
- Yield: the weight of espresso in the cup.
- Time: how long the shot runs, from starting the pump to stopping it.
Dose and yield give you the brew ratio (yield divided by dose). Time is controlled mainly by grind size.
What you need
- A grinder with an espresso range. You need small grind steps; see our espresso grinder guide.
- A scale that reads to 0.1 g, ideally with a timer. See our espresso scale picks.
- A tamper that fits your basket, for a level puck. Our espresso tamper guide covers sizes.
- Fresh beans, ideally roasted within the last few weeks.
How to dial in espresso, step by step
- Set your dose. Use the dose your basket is designed for. Many double baskets are built around 18 g; check yours. Keep this fixed while you dial in.
- Choose your target ratio. Start with 1:2, so 18 g in means about 36 g out. Use 1:1 to 1:1.5 for a ristretto-style shot, or 1:2.5 to 1:3 for a longer lungo-style shot.
- Grind and prepare the puck. Distribute evenly, tamp level, and lock in the portafilter.
- Start the pump and the timer together. Put your cup on the scale and tare it first.
- Stop at your target yield. Note the time.
- Adjust the grind for time: - Under about 25 seconds: grind finer. - Over about 30 seconds: grind coarser. - Far outside the window (under 20 or over 35 seconds): move several steps.
- Taste and fine-tune. Once time is close, use taste to decide: - Sour or thin: extract more. Grind a touch finer or run a few grams longer. - Bitter or drying: extract less. Grind a touch coarser or stop a few grams earlier. - Sweet and balanced: write it down. You're done.
Our espresso grind size chart shows where espresso sits among other brew methods and how fine to start.
Espresso ratios: ristretto, normale and lungo
| Style | Ratio (dose : yield) | Example from 18 g | Typical taste |
|---|---|---|---|
| Ristretto | 1:1 to 1:1.5 | 18–27 g out | Thick, intense, sweeter or sharper |
| Normale | 1:1.5 to 1:2.5 | 27–45 g out | Balanced; 1:2 (36 g) is the usual start |
| Lungo | 1:2.5 to 1:3 | 45–54 g out | Lighter body, more bitterness possible |
Ratios like these are widely used by specialty cafés and home baristas as starting ranges. Lighter roasts often taste better at longer ratios; darker roasts often taste better shorter.
Diagnosing a shot: what you see and taste
| Shot | Likely cause | Next change |
|---|---|---|
| Fast (under 20 s), sour, thin | Grind too coarse | Grind finer by a few steps |
| Slightly fast (20–25 s), a bit sour | Grind slightly coarse | Grind one step finer |
| 25–30 s, sour | Under-extracted | Grind one step finer or run a few grams longer |
| 25–30 s, bitter | Over-extracted | Grind one step coarser or stop a few grams earlier |
| Slightly slow (30–35 s), bitter | Grind slightly fine | Grind one step coarser |
| Very slow (over 35 s), harsh, dripping | Grind too fine | Grind coarser by a few steps |
| Fast but bitter, spurting | Channeling | Fix distribution and tamp before changing grind |
| Sweet and balanced, any time | Dialed in | Keep the recipe and write it down |
Why time is a guide, not a rule
The INEI's 25 ± 5 second window describes traditional Italian espresso with a small dose, a single shot of about 7 g. Modern home recipes use bigger doses and different ratios, and some coffees taste best a little outside 25–30 seconds. Use time to get close, then let taste decide. If a 33-second shot is delicious, it's a good shot.
How roast and freshness change the dial-in
- Light roasts are denser and harder to extract. Expect to grind finer, run longer ratios or use hotter water if your machine allows.
- Dark roasts extract easily and turn bitter fast. Try a coarser grind or a shorter ratio.
- Very fresh beans (a few days off roast) can release a lot of gas and run unpredictably. Many people wait several days after roasting.
- Older beans usually need a slightly finer grind as they age.
Common dial-in mistakes
- Changing several things at once. If you change grind and dose together, you won't know which one helped.
- Not weighing. Volume and "two-shot" buttons don't tell you the yield. Weigh it.
- Ignoring the puck prep. Uneven distribution and tilted tamps cause channeling that no grind setting can fix.
- Chasing the clock. A shot inside 25–30 seconds can still taste wrong, and one outside can taste great.
- Using pressurized baskets. Dual-wall baskets mask grind changes. Use a single-wall basket when you dial in with a proper grinder.
- Not purging the grinder. After a big grind change, discard a little coffee so your next dose reflects the new setting.
Dialing in on different machines
- Entry-level machines (thermoblock or ThermoJet, 54mm baskets): the method is the same. Use the single-wall basket.
- 58mm machines with pre-infusion or temperature control: you have more variables, but dial in grind first, then experiment with temperature or pre-infusion one at a time. Our semi-automatic espresso machine guide covers these.
- Super-automatic machines: you can usually change only grind setting and strength. Change the grind setting only while the grinder runs, if your manual says so, and give it a few cups to settle.
FAQ
What is a good starting recipe for dialing in espresso?
A widely used starting point for a double shot is 18 g of ground coffee in and about 36 g of espresso out, a 1:2 ratio, in roughly 25 to 30 seconds from when you start the pump. It is a common specialty-coffee starting point, not a formal standard, so adjust it by taste.
Should I adjust grind size or dose first?
Keep the dose fixed at what your basket is designed for and adjust grind size first, because grind is the main control for shot time. Once the time is in range, use yield to fine-tune the ratio and taste. Change only one variable per shot.
Why is my espresso sour?
Sour, sharp or thin espresso is usually under-extracted: water passed through too quickly or not enough was extracted. Grind finer to slow the shot, or let it run a few grams longer. Very fresh or very light roasts can also taste sour until you extract them more.
Why is my espresso bitter?
Bitter, harsh or drying espresso is usually over-extracted. Grind coarser, or stop the shot a few grams earlier. If the shot ran fast but still tastes bitter, suspect channeling: water found a crack in the puck. Improve distribution and tamp level before changing the grind.
How long should an espresso shot take?
The Istituto Nazionale Espresso Italiano (INEI) specification for certified Italian espresso uses 25 plus or minus 5 seconds. Many home baristas aim for about 25 to 30 seconds with an 18 g double. Time is a guide, not a rule: if a shot outside that window tastes great, keep it.