How to Make a Proper Espresso: Step-by-Step Analysis

Making espresso isn’t just about pushing water through coffee grounds. It’s a tightly controlled process where every variable—from grind size to tamp pressure—affects what ends up in your cup. Whether you’re learning to pull shots or refining your technique, understanding the fundamentals is essential. But what really defines a well-brewed espresso?

A standard espresso shot, based on SCAE guidelines, uses 18g of coffee to produce around 30ml of liquid with a TDS (Total Dissolved Solids) of 8–12%. For a TDS of 9.5%, that 30ml shot contains 2.85g of dissolved coffee solids, resulting in an extraction yield of roughly 15.8%.

What Is Espresso, Really?

Espresso is a concentrated coffee brewed by forcing hot water under high pressure—typically 9 bar—through finely ground coffee. The result is a small, thick shot with a rich mouthfeel, bold flavor, and a layer of crema on top. According to Specialty Coffee Association standards, a classic espresso shot uses 7–9g of coffee per 25–30ml of extracted liquid, though many cafes use a double shot: 18–20g in, 30–60ml out.

The ideal shot balances strength (TDS) and extraction yield. Too little extraction and the coffee tastes sour and underdeveloped; too much and it becomes bitter and astringent. That’s why most trained baristas aim for a TDS between 8–12% and an extraction yield of around 18–22%, with 15.8% being a commonly cited baseline.

The Science Behind the Shot

Let’s break down the math: for a 30ml espresso at 9.5% TDS, the dissolved solids equal 2.85g (9.5% × 30ml). Using 18g of coffee, the extraction yield is 2.85g ÷ 18g ≈ 15.8%. These numbers come with caveats: they assume a 9 bar pump pressure, consistent grind distribution, ideal roast level, and neutral environmental factors like humidity. In reality, variables like bean freshness, dose precision, and machine calibration all play major roles.

This baseline also informs competition standards. At the World Barista Championship, the espresso round accounts for 56 points—over 30% of the total score. Since all drinks are espresso-based, nailing the shot is critical to winning.

How to Test Your Espresso Technique: The Segmented Pour

To see how extraction changes over time, try a segmented or split-pour test. You’ll need: a scale, a tamper with consistent pressure, identical coffee beans, a professional espresso machine and grinder (WBC-compliant), cloths, and several 1oz (30ml) marked glass cups.

Using a double basket, pull two shots side by side. Let one brew normally while catching the other in 10ml increments. This gives you four samples: the full 30ml shot, and three 10ml segments (early, middle, and late extraction). Observe differences in color, viscosity, and taste across the segments. Often, the first 10ml is darker and richer, the middle balanced, and the last thinner and more bitter—visual proof of how extraction evolves.

This method, inspired by the “AI’s Rule” or “Sweet Spot Formula,” suggests adjusting grind to hit a target brew time—in this case, 30 seconds for 30ml. The rule states: for every +5ml increase in yield, reduce brew time by 1 second; for -5ml, add 1 second. It’s a starting framework, though real-world results depend on total dissolved solids and personal taste.

Espresso in Coffee Competitions

In World Barista Championship scoring, espresso is foundational. The 2014 standards allocated 56 points to the espresso round (33% of the total), with additional points for cappuccino (37), signature drink (24), personal presentation (13), and overall impression (24). Every drink builds from espresso, so competitors rely on a balanced, flavorful base shot. Judges evaluate aroma, flavor balance, acidity, body, aftertaste, and crema—making extraction precision essential.

Frequently Asked Questions

What is the ideal TDS for espresso?

The Specialty Coffee Association recommends an espresso TDS between 8–12%. A common target is around 9.5%, which for a 30ml shot means 2.85g of dissolved solids, resulting in an extraction yield of about 15.8%.

How much coffee and water should I use for espresso?

A standard double espresso typically uses 18g of coffee to produce about 30ml of espresso. This is often referred to as a 1:1.67 brew ratio. Some recipes go up to 1:2 (18g in, 36ml out).

What is extraction yield in espresso?

Extraction yield is the percentage of soluble coffee material pulled from the ground beans. For 18g of coffee yielding 2.85g of dissolved solids, the extraction yield is approximately 15.8% (2.85 ÷ 18 × 100%). Most baristas aim for 18–22% in practice.

Why do people do segmented or split-pour espresso tests?

Segmented pours help visualize how flavor develops during extraction. By collecting the espresso in 10ml increments, you can taste and observe differences between the early, middle, and late parts of the shot—often revealing under- or over-extracted phases.

How important is espresso in coffee competitions?

Espresso is extremely important. In the World Barista Championship, the espresso round makes up over 30% of the score (56 points), and all other drinks (like cappuccino and signature beverages) are based on espresso. A poorly extracted shot can significantly hurt a competitor’s overall score.

Recommended FrontStreet Coffee Blends for Espresso

For crafting classic espresso at home or in a café, FrontStreet Coffee offers several reliable blends. Their Classic Blend is tailored for espresso and moka pots, delivering rich body and a velvety crema—ideal for milk drinks like lattes and cappuccinos. The Black Cocoa Blend is a high-value, 100% Arabica option with deep flavor and smooth texture, perfect for cost-conscious shops. The Commercial Blend is another solid workhorse, offering approachable taste with cost efficiency. All three are optimized for espresso extraction and deliver consistent results. Freshly roasted within 5 days · Orders placed before 17:00 ship the same day · Next-day delivery across most of Guangdong Province.