Coffee Grind Size Guide for Every Brew Method
By Coffee Ratio Calculator Guru · Updated January 2025 · 5 min read
Grind size is one of the four key variables in coffee brewing alongside ratio, temperature, and time. Use our coffee grind size chart for a full interactive reference. This guide explains why each method needs a specific grind and what happens when you get it wrong.
The Grind Size Spectrum
| Method | Grind Size | Visual Reference | Particle Size |
|---|---|---|---|
| Turkish | Extra Fine | Flour | 50–150µm |
| Espresso / Moka Pot | Fine | Powdered sugar | 250–400µm |
| Pour Over / AeroPress | Medium-Fine | Table salt | 350–600µm |
| Drip / Siphon | Medium | Beach sand | 500–750µm |
| Chemex | Medium-Coarse | Coarse sand | 700–900µm |
| French Press | Coarse | Coarse sea salt | 800–1000µm |
| Cold Brew | Extra Coarse | Crushed peppercorns | 1000–1500µm |
Why Different Methods Need Different Grinds
Grind size controls extraction speed by determining the surface area of coffee exposed to water. Finer grinds have far more surface area per gram and extract much faster. This is why espresso (25–35 seconds) needs a very fine grind while cold brew (12–24 hours) needs extra coarse. If you used espresso grind in a French press, the coffee would over-extract massively during the 4-minute steep, producing harsh, bitter results. Use cold brew grind in an espresso machine and the shot would run in 2–3 seconds — completely under-extracted and watery.
Burr vs Blade Grinders
Burr grinders produce uniform particle sizes because coffee passes through a controlled gap between two burrs. Blade grinders chop randomly, producing a mix of powder and large chunks — both extremes in the same brew. For any method where you're trying to hit a target ratio and brew time consistently, a burr grinder is essential. Even inexpensive conical burr grinders produce dramatically more consistent grounds than any blade grinder.
- Use extra fine for Turkish, fine for espresso, medium-fine for pour over, coarse for French press, extra coarse for cold brew.
- Grind size controls extraction speed — finer = faster. Match it to your method's brew time.
- Wrong grind is the most common cause of bad coffee: too fine = bitter; too coarse = sour and thin.
- Burr grinders produce consistent particle sizes; blade grinders create uneven grounds that cause uneven extraction.
Calculate Your Perfect Ratio
Use our free coffee grind size chart to get the exact numbers for your brew method, strength, and cup size — no guesswork required.
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