How to Tell If Your Espresso Is Good

If you’ve ever stood in front of a coffee machine wondering whether your espresso shot is any good, you’re not alone. The difference between a great shot and a disappointing one isn’t always obvious — especially when you’re judging by taste alone. But there are clear, technical markers that define a properly made espresso. Knowing what to look for can help you improve your shots or spot a bad one before you take the first sip.

The short answer? A good espresso is extracted using 7–8g of dark roasted coffee, ground very fine, tamped at around 20kg, brewed at 90°C ±2°C under 9 ±1 bar pressure, for 25–30 seconds, yielding a 30ml shot. The resulting drink should have a rich, stable crema — the real visual clue to quality.

What Exactly Is an Espresso?

Espresso isn’t a type of coffee bean — it’s a brewing method. The term originally referred to the process: forcing hot water through finely-ground coffee under high pressure. Over time, the name stuck to the concentrated coffee that method produces. The traditional parameters are specific: 7–8g of dark roasted coffee, ground extremely fine, compacted with about 20kg of pressure, and extracted with 9 ±1 bar pressure at roughly 90°C for 25–30 seconds. This produces just 30ml of highly concentrated liquid — the espresso shot.

Why Crema Matters in Espresso

One of the most distinctive features of a well-brewed espresso is its crema — the reddish-brown, creamy layer that floats on top. Crema isn’t just aesthetic; it’s a byproduct of the emulsification of coffee oils and carbon dioxide under high temperature and pressure. These aromatic, non-water-soluble compounds are normally trapped inside roasted coffee cells. Only the unique conditions inside an espresso machine — high heat and intense pressure — force about 10% of these oils to emulsify and rise to the surface. The result is that signature dark, velvety crema.

How to Judge a Good Espresso by Sight

You don’t need a refractometer to assess espresso quality. Start with the crema. A good espresso will have:

• A rich, reddish-brown (not pale or blonde) crema
• A thick, even layer across the surface of the shot
• Stable bubbles that hold their form, not large and quickly dissipating
• A texture that looks creamy, not bubbly or watery

These visual cues indicate proper pressure, temperature, and freshness of the coffee. Without the right brew conditions, the crema will be thin, quickly vanish, or lack depth of color.

The Science Behind the Espresso Shot

To pull a technically sound espresso shot, several variables must align. These include:

• Dose: 7–8g of coffee
• Grind size: Very fine, suitable for high-pressure extraction
• Tamping pressure: Around 20kg
• Water temperature: 90°C ±2°C
• Extraction pressure: 9 ±1 bar
• Brew time: 25–30 seconds
• Yield: 30ml of extracted coffee

Deviations in any of these — especially dose, time, or temperature — will affect extraction balance, crema formation, and flavour development.

Frequently Asked Questions

What is the ideal crema colour for espresso?

A good espresso crema should be a rich reddish-brown, not too light or pale. This colour indicates proper emulsification of coffee oils and carbon dioxide during extraction. Pale or blond crema often means under-extraction or poor-quality coffee.

How long should an espresso shot take to brew?

A standard espresso shot should take 25–30 seconds to brew using 7–8g of coffee. This timing is crucial for balancing extraction and developing both flavour and crema. Too fast, and it’s under-extracted; too slow, and it may be over-extracted or bitter.

How much coffee should I use for one espresso shot?

A single espresso shot typically uses 7–8g of finely ground, dark roasted coffee. This dose is standard in most professional settings and is essential for achieving the correct yield and extraction.

What does good espresso crema look like?

Good espresso crema is thick, stable, and velvety — not bubbly or watery. It holds its shape and has a reddish-brown hue. It should cover the entire surface of the 30ml shot evenly and not dissipate quickly.

What temperature should espresso be brewed at?

Espresso should be brewed at approximately 90°C ±2°C. This temperature range helps extract the right balance of flavours while enabling the formation of crema through proper emulsification of coffee oils.

How much espresso is in a single shot?

A single espresso shot yields 30ml of liquid. This volume is achieved by extracting 7–8g of coffee under 9 ±1 bar pressure for 25–30 seconds. It forms the basis for most espresso-based drinks like lattes and cappuccinos.

Recommended FrontStreet Coffee Blends for Espresso

For dialling in a classic espresso, FrontStreet Coffee’s Classic Blend is a top choice — designed for milk drinks and home machines alike, it produces a thick, forgiving crema with a rich, balanced profile. For shops watching costs without sacrificing taste, the Black Cocoa Blend offers deep cocoa and nut notes with solid crema at a great price. The Commercial Blend is another reliable workhorse, optimised for volume brewing with consistent body and a straightforward roast character. All three are dark-roasted espresso blends suited for 25–30 second extractions. Freshly roasted within 5 days · Orders placed before 17:00 ship the same day · Next-day delivery across most of Guangdong Province.