How to Dial In Your Grind

If you only learn one thing about making better coffee, make it this. Grind size is the biggest lever you have, and "dialing in" simply means adjusting it until your coffee tastes right. Here's how to do it without overthinking it.

Why grind size matters

Grind size controls how fast water moves through your coffee. Finer grounds pack tighter and slow the water down; coarser grounds let it run through faster. That speed is what decides how much flavor the water pulls out — too little or too much, and the cup suffers.

The two tastes to listen for

You don't need fancy gear to know if you're off — your tongue tells you:

• Sour, weak, or thin? The water moved through too fast and didn't pull enough out (this is called under-extraction). Fix: grind finer.
• Bitter, harsh, or dry? The water moved through too slowly and pulled out too much (over-extraction). Fix: grind coarser.
• Sweet, balanced, and clean? You're dialed in. Leave it alone and enjoy.

The golden rule: change one thing at a time

Only adjust the grind — keep your dose (how much coffee you use), your water, and your technique the same. Change three things at once and you'll never know which one fixed it.

Dialing in espresso

A good starting target for a double shot: about 18 grams of coffee in, roughly 36 grams of espresso out, in about 25–30 seconds (that out-to-in is the classic 1:2 ratio). Then:

• Shot gushed out in under 20 seconds and tastes sour? Grind finer.
• Shot crawled out past 35 seconds and tastes bitter? Grind coarser.
• Move one notch at a time and pull another shot — grind size changes things fast.

A scale and a timer make this almost foolproof, and an even bed of grounds helps too — a quick stir with a WDT tool breaks up clumps so the water flows evenly instead of blasting through one weak spot.

Dialing in pour-over

Same logic, just coarser overall. If your pour-over drains too slowly and tastes bitter, go coarser. If it rushes through and tastes thin and sour, go finer. Aim for a total brew time in the right range for your dripper (often around 2–4 minutes) and adjust the grind to land there.

A few things that throw people off

• New bag, new dial. Different beans — and even the same beans at a different roast level — need a different setting. Re-dial when you switch.
• Fresh beans run faster. Very freshly roasted coffee releases gas (that's the bubbling you see), which can speed up the flow. You may need to grind a touch finer for the first few days.
• Consistency is everything. A good burr grinder grinds evenly every time, which is half the battle. Blade grinders make dialing in nearly impossible because the grounds come out uneven.

That's the whole game: taste, adjust one notch, taste again. Once you can hear what sour and bitter are telling you, you'll dial in any coffee in a few tries.