Dialing in espresso can feel complicated at first, but most problems come down to one simple thing: extraction.
If your espresso tastes too sour, it’s usually under extracted. If it tastes too bitter, it’s usually over extracted. That’s the foundation. Once you understand that, making adjustments gets much easier.
First: What Does “Dialing In” Mean?
Dialing in just means adjusting your espresso recipe so the coffee tastes balanced.
Most people adjust:
- Grind size
- Shot time
- Dose (how much coffee you use)
- Yield (how much espresso comes out)
The grinder is usually the biggest variable.
A good starting point for espresso is:
- 18g coffee in
- 36g espresso out
- Around 25–35 seconds
Not every coffee will taste best there, but it’s a reliable starting point.
If Your Espresso Tastes Sour
Sour espresso usually means the coffee extracted too quickly and the water didn’t pull enough flavor out of the grounds.
Common sour flavors:
- Sharp acidity
- Lemon-like
- Salty
- Thin or watery
- Quick finish
Grind Finer
This is usually the first adjustment to make. A finer grind slows the shot down and extracts more flavor.
Increase Extraction Time
If your shot is running in 18-22 seconds, try slowing it down closer to 28-32 seconds.
Increase Yield Slightly
Example:
- From 18g in / 36g out
- To 18g in / 40g out
This can help round out acidity.
If Your Espresso Tastes Bitter
Bitter espresso usually means too much was extracted from the coffee.
Common bitter flavors:
- Harsh
- Dry
- Burnt
- Woody
- Lingering bitterness
Grind Coarser
A coarser grind speeds the shot up and reduces extraction.
Shorten the Shot
If your espresso is running 40+ seconds, it may be over extracting.
Reduce Yield Slightly
Example:
- From 18g in / 36g out
- To 18g in / 32g out
This often creates a sweeter, heavier shot.
Photo by: La Marzocco
Don’t Chase Numbers Too Hard
Espresso recipes are guides, not rules. Some coffees taste best at 24 seconds. Others might shine at 38 seconds. Lighter roasts often need longer extraction than darker roasts.
The goal is simple:
- Sweetness
- Balance
- Texture
- Clarity
If it tastes good, you’re doing it right.
Change One Variable at a Time
This is the biggest mistake people make when dialing in espresso. If you change grind size, dose, yield, and tamp pressure all at once, it becomes impossible to know what actually helped. Make one adjustment at a time and taste the result.
A Simple Espresso Cheat Sheet
Sour?
- Grind finer
- Slow the shot down
- Increase extraction
Bitter?
- Grind coarser
- Speed the shot up
- Reduce extraction
That’s really the core of espresso dialing. Once you understand whether your shot is under extracted or over extracted, the process becomes much less intimidating.