Espresso Extraction Workflow: A Practical Shot-by-Shot Method

This page is the practical side of extraction: a step-by-step workflow you can run at home or behind the bar. It does not repeat the theory. For what TDS, extraction yield and the brewing control chart mean, read coffee extraction science. For a symptom-by-symptom troubleshooting table, see the dial-in guide.

If you would like a guided version of this workflow, our short video course Dial In Espresso by Taste takes you through it lesson by lesson.

Why Espresso Needs a Workflow

Espresso is the least forgiving way to brew. Researchers describe it as the coffee format most susceptible to variation in quality, and found that much of that inconsistency comes from the grinder and how water flows through the puck, not just from the person making it (Cameron et al., Matter, 2020).

Recipes have also drifted a long way from the old definition. The same paper notes that the SCA historically defined espresso as 7–9 g of coffee making a 25–35 mL drink in 20–30 seconds at 92–95 °C and 9–10 bar, while cafés today routinely use 15–22 g of coffee for a 30–60 g drink (Cameron et al., 2020). With that much range, a written routine is what keeps your shots consistent.

The Workflow at a Glance

Step 1: Set Up for Consistency

• Use a scale that reads to 0.1 g for both the dose and the shot. Weight is what extraction maths runs on, and crema makes volume unreliable.
• Match the dose to the basket. Baskets are sized for a dose range. Start in the middle of your basket’s range and keep it fixed while you dial in.
• Keep one coffee for a whole dial-in session. Switching beans mid-way resets everything.
• Warm up the machine and portafilter fully before your first shot, and flush the group head between shots.
• Grind fresh for each shot. Purge any old grounds sitting in the grinder so the shot gets the setting you chose.

Step 2: Choose a Brew Ratio

The brew ratio is dose to yield: 18 g in and 36 g out is 1:2, a common starting point and close to the 20 g in, 40 g out recipe used in the espresso study above (Cameron et al., 2020). Choose your ratio before you touch the grinder, then hold it steady.

Need to scale a recipe? Our brew ratio calculator does the maths.

Step 3: Prepare the Puck the Same Way Every Time

The goal of puck prep is an even bed with no dense or loose spots, so water does not race through one channel. When flow is uneven, parts of the puck over-extract while others barely extract, and the shot can taste sour and bitter at the same time (Cameron et al., 2020).

1. Distribute. Break up clumps and spread the grounds evenly, for example with a fine-needle distribution tool (the Weiss Distribution Technique, or WDT).
2. Level. Get a flat surface before tamping. A tilted bed is thinner on one side, and water will favour it.
3. Tamp level and consistently. In the espresso study, changing tamp pressure across the tested range made no appreciable difference to shot time or extraction yield, so focus on a level, repeatable tamp rather than force (Cameron et al., 2020).
4. Lock in and start promptly so the puck does not sit on a hot group head.

Step 4: Pull the Shot and Record It

Stop the shot by weight, not by eye. Then write it down. A simple log turns guesswork into a pattern you can read.

The second row shows the point of logging: one change (grind one step finer), one difference you can taste.

Step 5: Adjust One Variable at a Time

Work in this order, and change only one thing per shot:

1. Grind to set flow. With dose and ratio fixed, adjust grind so the shot runs at a steady, even pace and tastes balanced. Finer slows the flow and usually increases extraction; coarser speeds it up.
2. Ratio to tune strength and balance. Once flow is stable, lengthen the ratio if the shot is intense but sharp, or shorten it if it is thin.
3. Temperature last. Hotter water generally extracts faster; an espresso study reviewed by UC Davis researchers found that raising water temperature from 88 to 98 °C increased strength and extraction and made shots more bitter and roasty (Batali et al., 2020). Change it in small steps only after grind and ratio are settled, and only if your machine lets you set it reliably.

Watch for one trap. Grinding finer does not always increase extraction. Cameron and colleagues found that below a certain grind setting, extraction yield actually fell and became more variable because parts of the puck stopped extracting evenly (2020). If finer grinding makes shots taste muddled, harsh and sour together, you have probably gone past that point.

For a full map of what each taste problem means and what to try next, use the espresso dial-in guide. Its troubleshooting table pairs with this workflow.

An Evidence-Based Option: Less Coffee, Coarser Grind

One finding from the 2020 espresso study is worth knowing about. Instead of grinding very fine to hit a 25–30 second target, the researchers reduced the dose and ground coarser to keep flow even. Their model suggested steering espresso by coffee mass and water mass rather than brew time (Cameron et al., 2020).

• They showed that a 15 g dose ground much coarser could reach the same extraction yield as a 20 g shot, with much less shot-to-shot variation.
• A café in Eugene, Oregon that adopted the approach cut coffee per drink by 25%, and shots routinely ran in about 14 seconds.
• The trade-offs: faster shots, lower concentration and a different flavour profile. The authors stress that the barista still has to taste.

If your shots are inconsistent and you keep grinding finer to slow them down, this is worth an experiment.

Should You Measure TDS?

A refractometer is optional. It lets you calculate extraction yield (TDS × shot weight ÷ dose) and compare shots objectively, which is useful in a café or when you are learning. But the researchers behind the espresso study note that two shots can reach the same yield in very different ways and taste different, so the number never replaces tasting (Cameron et al., 2020). The extraction science guide explains how to take a reliable reading.

Workflow Checklist

• Same coffee, same basket, same dose for the whole session
• Ratio chosen before touching the grinder
• Even distribution, level tamp, prompt start
• Shot stopped by weight, time noted, taste written down
• One change per shot: grind, then ratio, then temperature

Frequently Asked Questions

What ratio should I start with for espresso?

A 1:2 ratio is a common starting point, for example 18 g of coffee in and 36 g of espresso out. A shorter ratio gives a denser, stronger shot; a longer ratio gives a lighter shot and usually a higher extraction. Pick one, keep it fixed while you dial in grind, and only then experiment.

Should I aim for a 25–30 second shot?

Use time as a check, not the goal. The historical SCA espresso definition used a 20–30 second flow time, but researchers modelling espresso extraction suggest steering by the mass of coffee and the mass of water instead. If the shot tastes good and repeats, the exact seconds matter less.

How hard should I tamp?

Hard enough to make a level, compact bed, and the same way every time. In a published espresso study, changing tamp pressure across the range tested made no appreciable difference to shot time or extraction yield, so consistency and a level tamp matter more than force.

Why weigh the espresso instead of measuring volume?

Crema makes volume unreliable, and weight is what extraction maths uses. Weighing dose and yield to 0.1 g lets you repeat a recipe exactly and compare one change against another.

How is this different from dialing in?

This guide is the routine you follow for every shot: setup, ratio, puck prep, logging and one-change-at-a-time adjustments. Dialing in is what you do when a particular coffee tastes off, and our espresso dial-in guide maps each taste problem to the fix.

Keep Learning

• Coffee extraction science: TDS, extraction yield and the brewing control chart
• Espresso dial-in guide: fix sour, bitter, fast or slow shots
• Espresso drink ratios for latte, cappuccino and flat white
• Water chemistry for better extraction
• How to become a barista
• Espresso channeling: what it is and how to fix it

Sources

• Cameron, M. I. et al. (2020). Systematically Improving Espresso: Insights from Mathematical Modeling and Experiment. Matter 2, 631–648.
• Batali, M. E., Ristenpart, W. D. & Guinard, J.-X. (2020). Brew temperature, at fixed brew strength and extraction, has little impact on the sensory profile of drip brew coffee. Scientific Reports 10, 16450.