The Complete Guide to Coffee Grind Size

Why Grind Size Matters

If you've ever brewed a cup of coffee that tasted bitter, sour, or just flat — grind size might be the culprit. It's one of the most overlooked variables in home brewing, yet it has an enormous impact on flavor. Here's everything you need to know.

The Science Behind the Grind

When hot water meets coffee grounds, it extracts compounds that create flavor. Grind size controls how quickly that extraction happens. Finer grinds have more surface area, so water extracts flavor faster. Coarser grinds have less surface area, so extraction is slower.

• Under-extracted coffee (too coarse or too short): tastes sour, weak, or watery
• Over-extracted coffee (too fine or too long): tastes bitter, harsh, or astringent
• Perfectly extracted coffee: balanced, sweet, and complex

Grind Size by Brewing Method

Extra Coarse — Cold Brew

Think chunky sea salt. Cold brew steeps for 12–24 hours, so a very coarse grind prevents over-extraction during that long contact time.

Coarse — French Press & Percolator

Resembles rough kosher salt. French press uses full immersion brewing, so a coarse grind keeps the coffee from becoming muddy or bitter.

Medium-Coarse — Chemex

Slightly finer than French press. The Chemex's thick filter slows flow rate, so a medium-coarse grind balances extraction beautifully.

Medium — Drip Coffee Makers

The most common grind — like regular sand. Most automatic drip machines are calibrated for this grind size, making it the everyday workhorse.

Medium-Fine — Pour-Over (V60, Kalita)

A touch finer than drip. Pour-over methods give you more control over flow rate, and a medium-fine grind helps you dial in a clean, bright cup.

Fine — Espresso

Like table salt or fine sand. Espresso forces pressurized water through tightly packed grounds in 25–30 seconds, requiring a fine grind for proper resistance.

Extra Fine — Turkish Coffee

Almost powder-like. Turkish coffee is boiled directly with the grounds, so an ultra-fine grind is needed for the right texture and flavor.

Burr vs. Blade Grinders

If you're serious about your coffee, invest in a burr grinder. Unlike blade grinders (which chop beans unevenly), burr grinders crush beans between two abrasive surfaces for a consistent, uniform grind — which means more even extraction and better flavor.

Start with Great Beans

Even the perfect grind can't save stale or low-quality beans. Start with freshly roasted coffee and grind just before brewing for the best results. Browse our coffee collection to find your perfect roast.