How do I dial in a new bag of espresso beans?

Every time you open a new bag of espresso beans, you are dealing with a unique set of variables: roast level, bean density, age, and processing method. Because these factors influence how the beans interact with water, you cannot assume that the settings from your previous bag will work for the new one. "Dialing in" is the process of calibrating your espresso extraction to find the sweet spot where the coffee tastes its best.

Start with a standard recipe—often a 1:2 ratio (e.g., 18 grams of ground coffee producing 36 grams of liquid espresso) in about 25–30 seconds. Weighing both your input and output is non-negotiable. Pull your first shot and taste it. If the shot is sour, thin, or watery, it is likely under-extracted; your grind is too coarse, allowing water to move too quickly without picking up enough solids. Adjust your grinder to a finer setting. If the shot tastes intensely bitter, harsh, or has a dry, astringent finish, it is likely over-extracted; your grind is too fine. Adjust to a coarser setting.

The key to successful dialing in is changing only one variable at a time. Do not change your dose, your water temperature, or your tamping pressure while adjusting the grind. Once you change the grind, pull another shot. You will likely need to purge a few grams of coffee from your grinder to ensure the new setting is fully reflected in the next dose. Continue this process, tasting carefully after each adjustment. Look for balance: the presence of sweetness, a pleasant acidity, and a smooth mouthfeel.

In practice, remember that taste is your final judge, not the timer. While 25–30 seconds is a helpful guideline, some coffees—especially lighter roasts—may taste better at longer extraction times, while others may shine at shorter ones. Dialing in is not about chasing a perfect number; it is about learning how to manipulate your equipment to highlight the specific characteristics of the coffee you are brewing. By approaching this systematically, you transform from a casual user into someone who can consistently extract the best potential from any bag of beans.