How We Choose the Right Coffee Grind Size

Ever pulled a shot that tasted sour or brewed a pour-over that came out bitter? More often than not, the culprit is grind size. Getting it right is the difference between balanced extraction and a ruined cup. Whether you’re brewing espresso, French press, or V60, dialing in your grind is the first—and most impactful—step.

We use a Mazzer flat burr grinder (parallel burr type) and have fine-tuned grind settings across multiple brew methods. These numbers work well for us, though every grinder is different, especially as burrs wear in. Use these as a starting point and adjust based on taste and shot time.

Why Grinder Choice Matters for Grind Consistency

Not all grinders are built the same. Some are designed specifically for espresso, others for filter coffee, and some try to do both. Our current grinder isn’t considered the best for single-origin filter brewing—if you want that, look to commercial espresso grinders found in cafés like Starbucks. But for the price and within our setup, this Mazzer model gives us consistent enough particle distribution, especially when we control heat buildup during grinding. That makes it a solid value-for-money option in our workflow.

Our Grind Size Settings for Different Brewing Methods

Here’s how we set the grind size on our Mazzer grinder for various common brew methods. These numbers refer to the grinder’s internal scale settings—not microns or grams. Remember, burr wear and ambient conditions may affect these over time, so always confirm extraction results.

• Espresso: Around setting X (specific number not provided, but refers to the machine’s marked scale used in-house)
• Pour Over (e.g., V60, Kalita Wave): Finer than drip but coarser than espresso—approximately setting Y
• French Press: Much coarser, around setting Z
• Cold Brew: Very coarse, near the grinder’s coarsest usable setting

If you’re using a Baratza grinder (like the popular Baratza SJ), these settings can offer a rough comparison—but every grinder’s burr design and calibration differ. Treat these as directional guidance only.

How We Adjust Grind Size for Better Extraction

We start with a baseline setting based on brew method, then adjust based on three factors: extraction time, taste balance, and flow rate (where applicable). For espresso, we aim for a 25–30 second extraction window. For pour-over, we look for a total brew time of around 2:30–3:00 minutes depending on pour technique and dose. Taste is always the final judge—if it’s sour, we grind finer; if it’s bitter, we go coarser.

We also monitor grinder temperature during use. Excessive heat can degrade aroma compounds and alter particle size distribution. To mitigate this, we avoid grinding large batches consecutively and allow brief pauses during high-volume sessions.

Frequently Asked Questions

What grind size should I use for pour over coffee?

For pour over methods like V60 or Kalita Wave, use a medium-fine grind—finer than what you’d use for drip coffee but coarser than espresso. On our Mazzer grinder, that’s around a specific internal setting (not specified numerically here), which might translate differently on other machines. The goal is a brew time of around 2:30–3:00 minutes for balanced extraction.

Can I use the same grind size for espresso and filter coffee?

No. Espresso requires a much finer grind to slow extraction and increase pressure, while filter coffee uses a coarser grind to allow water to flow freely and extract more gently over several minutes. Using espresso grind for filter brewing will lead to over-extraction and bitterness; using filter grind for espresso will cause under-extraction and sourness.

How do I know if my grind size is wrong?

Taste is the best indicator. Sour, weak, or under-developed flavours suggest the grind is too coarse (under-extracted). Bitter, harsh, or overly strong flavours mean the grind is too fine (over-extracted). Adjust your grind setting finer or coarser in small increments and re-brew to find balance.

Does burr type affect grind quality?

Yes. Flat burrs (like those in Mazzer grinders) tend to produce more uniform particles, which is ideal for controlled extraction. Conical burrs may produce a wider particle distribution, which can impact consistency. Both can work well, but flat burrs are generally preferred for precision brewing.

How often should I adjust my grind size?

You should adjust grind size every time you change brew method, coffee bean origin, roast level, or dose. Even slight changes in bean freshness or humidity can affect flow and extraction, so regular tweaks are part of dialling in a great cup.

Recommended FrontStreet Beans for Grinding Experiments

Try FrontStreet’s Ethiopia Humbera for bright, floral pour overs; its juicy profile shines at a medium-fine grind. For espresso, their PWN Golden Mandheling offers heavy body and dark chocolate notes, best at a fine espresso setting. Both beans are expertly roasted to highlight their unique profiles and respond predictably to grind adjustments. Freshly roasted within 5 days · Orders placed before 17:00 ship the same day · Next-day delivery across most of Guangdong Province.