How to Dial In Espresso: A Step-by-Step Guide That Actually Makes Sense

Dialing in espresso is the process of adjusting your variables such as grind size, dose, yield, and time until your shot tastes good. It sounds complicated because the internet makes it complicated. It's not. You're adjusting one thing at a time until the coffee tastes right to you.

This guide assumes you have a semi-automatic espresso machine and a burr grinder with fine enough adjustment for espresso. If you're using a super-automatic, most of this is handled internally and your adjustments are limited to grind size and drink volume via the machine's settings.

The Four Variables

Dose: How much dry coffee goes into the portafilter. Measured in grams. For most home setups with a standard double basket, you're looking at 17–19 grams. Weigh it with a kitchen scale. Eyeballing it doesn't work for espresso.

Grind size: How fine or coarse your coffee is ground. For espresso, you want fine; roughly the texture of table salt or slightly finer. This is the variable you'll adjust most often.

Yield: How much liquid espresso comes out. Also measured in grams (or milliliters, since espresso is close enough to water density that they're interchangeable for our purposes). A standard double shot yields roughly 34-40 grams of liquid.

Time: How long the shot takes to reach your target yield. For a standard espresso, you're aiming for 25-35 seconds from when you start the pump to when you stop it.

The Starting Recipe

Start here every time you open a new bag of beans:

• Dose: 18 grams
• Target yield: 36 grams (a 1:2 ratio)
• Target time: 27-33 seconds
• Grind: Start at a medium-fine espresso setting and adjust from there

The 1:2 ratio (18g in, 36g out) is a standard starting point that works for most medium-roast espresso blends. Lighter roasts often benefit from a longer ratio (1:2.5 or even 1:3). Darker roasts sometimes taste better at a shorter ratio (1:1.5 to 1:2).

Step-by-Step Process

Step 1: Set your dose. Put 18 grams of freshly ground coffee in your portafilter. Level it off and tamp with even, firm pressure. You don't need to tamp with maximum force! Consistent, level pressure is what matters.

Step 2: Pull the shot. Place your cup on a scale, tare it to zero, start the pump, and watch the scale. Stop the pump when you hit 36 grams of liquid in the cup. Note how long it took.

Step 3: Evaluate the time.

• If the shot ran too fast (under 25 seconds): Your grind is too coarse. The water is flowing through too easily. Make your grind finer with one small adjustment on your grinder.
• If the shot ran too slow (over 35 seconds): Your grind is too fine. The water can't get through. Make your grind coarser. One small adjustment.
• If the time is in range (25-35 seconds): Move to step 4.

Step 4: Taste it. This is where it matters. Forget the numbers, do you like how it tastes?

• Sour, thin, sharp, or tea-like: The coffee is under-extracted. Either grind finer (to slow the shot down and increase extraction) or increase your yield (pull a longer shot, like 40g instead of 36g).
• Bitter, ashy, harsh, or hollow: The coffee is over-extracted. Either grind coarser (to speed the shot up and decrease extraction) or decrease your yield (pull a shorter shot, like 32g instead of 36g).
• Sweet, balanced, full-bodied, pleasant aftertaste: You're dialed in. Don't change anything until the beans age or you open a new bag.

Step 5: Adjust one thing at a time. This is the most important rule. If you change grind size and dose simultaneously, you won't know which change helped (or hurt). Change one variable, pull a shot, taste, evaluate, repeat.

Common Situations and Fixes

"My shot gushes out in 15 seconds." Way too coarse. Make a significant grind adjustment finer with not just one click, but several. You're in the wrong neighborhood.

"Nothing comes out at all." Way too fine. Your grind has effectively created a wall that water can't penetrate. Go significantly coarser.

"The shot looks good but tastes sour." Classic under-extraction. Try grinding one step finer first. If you're already in the right time range, try increasing your yield (let the shot run longer, from 36g to 40-42g).

"The shot looks good but tastes bitter." Over-extraction. Grind one step coarser, or reduce yield (stop the shot earlier, at 32-34g instead of 36g).

"The shot tastes good for the first sip but bitter at the end." This is called channeling. Water is finding paths of least resistance through your puck instead of flowing evenly. Focus on your distribution and tamping: make sure the grounds are evenly distributed in the basket before tamping, and tamp level.

"The shot was perfect yesterday but terrible today." Coffee changes as it ages. Beans typically taste best 7-21 days after roast. As they age past that window, they degas and the optimal grind setting shifts. If yesterday's setting isn't working, adjust grind slightly finer (older beans typically need a finer grind).

The Mental Model

Think of it this way: extraction is a spectrum from under to over. Sour is under-extracted. Bitter is over-extracted. Sweetness lives in the middle. Your job is to land in the sweet spot.

Everything you adjust either increases or decreases extraction:

Increases extraction: finer grind, higher yield, longer time, higher temperature. Decreases extraction: coarser grind, lower yield, shorter time, lower temperature.

For most daily adjustments, grind size is the only variable you need to touch. Set your dose at 18g, your target yield at 36g, and adjust grind until the time falls in range and the shot tastes balanced. That's it.

How Often Do You Need to Dial In?

Every time you open a new bag of beans. Sometimes midway through a bag as the beans age. If you're using the same beans and your shots suddenly taste off, adjust grind one step finer. Aging beans are the most common culprit.

Once dialed in, most bags stay relatively stable for 1-2 weeks before needing minor adjustment. You're not re-dialing every morning, just making small tweaks as needed.

Stop Overthinking It

The espresso community has a tendency to turn this into rocket science. It's not. You're making coffee. Weigh your dose, pull a shot, taste it, adjust if needed. The goal isn't a perfect extraction score, it's a cup of espresso that you enjoy drinking. Trust your taste buds more than any formula.