Dialing in Your Coffee Grinder
Great coffee relies on consistency, but beans change as they age, requiring small adjustments to your grinder. By keeping your dose weight stable, the grind size becomes your single variable to master the flow of water.
Consistency is your baseline.
Use a digital scale to weigh your coffee to the gram every single time; without a constant dose, you cannot reliably measure the effect of your grind adjustments.
- digital gram scale
- timer
- espresso machine or brew device
- burr grinder
What goes in.
- 18gfreshly roasted coffee beans
- 36gfiltered water (for espresso ratio)
Small moves, big impact
Only change your grind setting while the burrs are spinning to prevent jamming. Adjust in tiny increments—no more than a quarter-turn of the dial at a time—before pulling your next shot.
The method.
Select a starting point
Set your grinder to the manufacturer's suggested baseline for espresso. If unknown, go until the burrs just touch, then back off slightly.
Pull a test shot
Grind 18g of coffee and aim for 36g of liquid output. Start your timer the moment you engage the pump.
Evaluate the flow
If the shot flows too fast (under 25 seconds) and tastes thin or sour, move the grinder one notch finer. If it flows too slow (over 35 seconds) and tastes bitter or chalky, move it coarser.
Clean the chute
Always purge 2-3 grams of coffee after changing a setting to ensure the next shot uses only the new grind size.
Other turns to take.
The Taste-First Approach
Ignore the timer once you are in the 25-35 second window and adjust solely based on whether you prefer more acidity or more depth.
When it doesn't go to plan.
Keep a log of your settings; if you switch beans, your starting point will change.
Higher roast levels usually require a coarser grind than lighter, denser beans.
If your machine has a pressure gauge, keep an eye on it—a needle spiking high often means your grind is too fine.
The ones that keep coming up.
Why does my setting change every few days?
As beans age, they lose moisture and CO2, which changes their density and how they interact with water. You will naturally need to grind finer as the bag gets older.
Can I use the same setting for different types of coffee?
Rarely. Different regions and processing methods result in beans with different structural integrity, meaning each new bag will require a new calibration process.
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