Dialling in an espresso machine properly means setting all the controls so the water extracts just the right amount of flavour from the coffee. You do this by balancing the grind size, coffee dose, pressure and extraction time. When these factors are in harmony, you get an espresso with a rich flavour, a creamy crema layer and the perfect balance between acidity and bitterness. Think of it as fine-tuning your machine so every bean shows exactly what it’s got inside.
Why is dialing in your espresso machine so important?
A well-dialled espresso machine delivers an espresso with the right flavour balance. When your machine isn’t set correctly, you’ll notice immediately: overly bitter coffee often comes from too fine a grind or too high pressure, while a sour taste usually results from too coarse a grind or too low a temperature. By dialing in your machine properly, you not only get the best out of your espressobonen, but also from your own barista skills. This way, every espresso tastes full, smooth and balanced — just as it’s meant to be.
The key settings explained step by step
The main settings on your espresso machine are the coffee dose, grind size, tamp pressure, temperature and extraction time. These five factors together determine how your espresso tastes and feels. If any one of these settings is off, you’ll notice it straight away in your cup. Below you’ll find step-by-step instructions on how to set each factor correctly.
-
The right coffee dose
Use between 18 and 20 grams of ground coffee for a double espresso. This is usually the ideal ratio for a full flavour without bitterness. Weigh your coffee with a barista scale, because even a one gram difference can affect the flavour. Too much coffee makes your espresso syrupy, too little results in a watery taste.
-
Adjusting the grind size
A good espresso extracts in 25 to 30 seconds. If the coffee flows through too quickly, the grind is too coarse. If it takes longer, the grind is too fine. Adjust the grind size in small steps and test again. This is often the most important factor when dialing in your espresso machine.
-
Tamp pressure and distribution
Press the ground coffee firmly and evenly with about 15 to 20 kilos of pressure. This ensures the water meets the same resistance everywhere and flows evenly through. If you tamp too hard, the espresso can become bitter; tamp too softly and the water flows too fast, making the coffee weak.
-
Water temperature and pump pressure
The ideal water temperature is between 90 and 96 degrees Celsius, with a pump pressure of about 9 bar. Water that’s too hot extracts too many bitter compounds, while water that’s too cold makes the flavour flat. Modern machines regulate this automatically, but with manual models you can often adjust it yourself.
-
Extraction time and volume
An espresso should extract in 25 to 30 seconds and yield about 25 to 30 millilitres per shot. Keep a timer handy and adjust your grind or dose if it’s too fast or too slow. The right extraction time is key to a balanced espresso with a beautiful crema layer.
How to test and improve your settings
Test and improve your settings by adjusting only one element at a time and tasting the result. This way you discover step by step which change has the biggest effect. Start with the grind size, as it has the greatest impact on flavour and extraction time. Then pull an espresso, note the time, and assess the flavour. Is the coffee too bitter? Make the grind a bit coarser. Too sour? Grind finer. Always use the same amount of coffee and tamp pressure so you know exactly what’s changing. By measuring, tasting and noting, you gain more control over your machine and your espresso.
Common mistakes when setting up an espresso machine
The most common mistakes when setting up an espresso machine are:
- Wrong grind size: too coarse gives a sour, watery espresso; too fine makes it bitter and syrupy.
- Using too much or too little coffee: even a one gram difference affects flavour and extraction time.
- Uneven tamp pressure: tamping too hard or unevenly causes uneven water flow.
- Not using a scale or timer: without measuring, you don’t know what you’re adjusting or why the result changes.
- A dirty machine: coffee residues in the group head or portafilter make every shot more bitter and flat.
If you avoid these mistakes, you’ll notice the difference immediately. Your espresso will be more consistent, richer in flavour, and your machine will perform better for longer.
