Enter your shot parameters, select what tastes off, and get specific fixes.
About Dialing In Espresso
Dialing in is the iterative process of adjusting your espresso recipe until the shot tastes balanced. The three core variables are dose (grams of dry coffee), yield (grams of liquid espresso), and time (how long the shot runs). Together, these determine the extraction - how much of the coffee's soluble material ends up in your cup.
Under-extracted espresso (too little dissolved) tastes sour, thin, and sharp. Over-extracted espresso (too much dissolved) tastes bitter, astringent, and hollow. The goal is to land in the middle, where sweetness, acidity, and body are in balance. Most specialty espresso targets 18-22% extraction yield, which corresponds to roughly a 1:2 ratio pulled in 25-30 seconds.
Grind size is the primary lever. Finer grinds slow the shot and increase extraction. Coarser grinds speed it up and decrease extraction. Temperature, dose, and yield are secondary adjustments. Change one variable at a time, taste the result, and iterate. Most baristas can dial in a new coffee within 3-5 shots.
Frequently Asked Questions
What does dialing in espresso mean?
Dialing in is the process of adjusting your grind size, dose, yield, and time to extract the best possible flavor from a specific coffee. Every new bag of beans requires dialing in because variables like roast date, origin, and density all affect extraction. The goal is to find the sweet spot where the shot tastes balanced - not too sour (under-extracted) and not too bitter (over-extracted).
Why does my espresso taste sour?
Sour espresso is under-extracted, meaning water did not pull enough flavor from the grounds. The most common fix is to grind finer, which increases surface area and slows down the shot, giving water more time to extract. You can also try increasing the yield (more liquid out) or raising the brew temperature by 1-2 degrees Celsius. If the coffee is very fresh (less than 5 days off roast), the excess CO2 can also cause channeling and sourness.
Why does my espresso taste bitter?
Bitter espresso is over-extracted, meaning water pulled too much from the grounds, including undesirable compounds. Grind coarser to speed up the shot and reduce contact time. You can also decrease the yield (less liquid out) or lower the brew temperature by 1-2 degrees Celsius. Dark roasts are more prone to bitterness and often benefit from lower temperatures (88-90C) and shorter ratios (1:1.5 to 1:2).
What is the ideal espresso ratio?
The most common starting ratio is 1:2, meaning for every gram of dry coffee in, you get two grams of liquid out (e.g., 18g in, 36g out). However, there is no single ideal ratio. Ristretto shots use 1:1 to 1:1.5 for intense concentration. Standard espresso sits at 1:1.5 to 1:2.5. Lungo shots use 1:3 or more for a lighter, more diluted cup. The right ratio depends on the coffee, the roast level, and personal taste.
How long should an espresso shot take?
A standard espresso shot should take 25-30 seconds from the moment you start the pump to when you stop it. Shots under 20 seconds are running too fast (grind finer). Shots over 35 seconds are running too slow (grind coarser or reduce dose). However, time alone does not determine quality - it is the combination of time, dose, yield, and taste that matters. Some light-roast specialty coffees pull best at 30-35 seconds.
What should I adjust first when dialing in?
Start with grind size. It has the biggest impact on extraction and shot time. Keep your dose constant (18g is a common starting point for a double basket), set a target yield (36g for a 1:2 ratio), and adjust grind size until the shot lands in the 25-30 second range. Once the time is right, taste the shot. If it is sour, grind slightly finer. If bitter, grind slightly coarser. Only change one variable at a time so you can track what each adjustment does.