You bought great coffee. You brewed it carefully. And it still tasted... off. Bitter, weak, or just flat.
Nine times out of ten, the culprit is grind size.
Grind size is one of the most important — and most overlooked — variables in brewing great coffee. Get it right and your coffee sings. Get it wrong and even the best beans in the world can't save you.
Here's everything you need to know.
Why Grind Size Matters
When hot water meets coffee grounds, it extracts flavor compounds from the bean. The size of your grind controls how fast that extraction happens.
- Too fine = over-extraction = bitter, harsh, astringent coffee
- Too coarse = under-extraction = weak, sour, watery coffee
- Just right = balanced extraction = smooth, flavorful, complex coffee
Different brew methods move water through coffee at different speeds, which is why each method needs a different grind size.
The Grind Size Guide
Extra Coarse — Cold Brew
Think rough sea salt. Cold brew steeps for 12-24 hours, so you need a very coarse grind to prevent over-extraction over that long contact time. This produces the smooth, low-acid concentrate cold brew is known for.
Coarse — French Press
Think kosher salt. French press uses full immersion brewing — the grounds sit in water for 4 minutes. A coarse grind keeps the extraction balanced and prevents too many fine particles from slipping through the metal filter into your cup.
Medium-Coarse — Chemex
Slightly finer than French press. The Chemex uses a thick paper filter that slows the flow, so you need a grind that won't clog it but still extracts fully.
Medium — Drip Coffee Maker
Think regular table salt. This is the sweet spot for most automatic drip machines. It's also a great starting point if you're not sure what grind to use.
Medium-Fine — Pour Over (V60, Kalita Wave)
Slightly finer than drip. Pour over gives you more control over brew time, and a medium-fine grind lets you dial in extraction precisely. This is where grind consistency really matters — a good burr grinder makes a big difference here.
Fine — Espresso
Think powdered sugar, but not quite. Espresso forces hot water through grounds under high pressure in 25-30 seconds. A fine grind creates enough resistance for proper extraction in that short window. Too coarse and it'll run through too fast; too fine and it'll choke the machine.
Extra Fine — Moka Pot / Turkish Coffee
Almost powder-fine. Moka pots use steam pressure and need very fine grounds. Turkish coffee is ground to a powder and brewed unfiltered — the finest grind of all.
A Note on Kenya Single Origin
If you're brewing a bright, complex single origin like our Kenyan coffee, grind size becomes even more important. Kenyan coffees tend to have a bold, wine-like acidity with notes of blackcurrant and citrus. A medium-fine grind in a pour over is the best way to highlight those flavors — it gives you control over the extraction and lets the origin's character shine through.
Brew it too coarse and you'll miss the complexity. Too fine and the brightness turns harsh. The pour over sweet spot is where the magic happens.
Burr Grinder vs. Blade Grinder
If you're serious about coffee, invest in a burr grinder. Here's why:
- Blade grinders chop beans unevenly, producing a mix of fine dust and large chunks. This leads to uneven extraction — some grounds over-extract while others under-extract.
- Burr grinders crush beans between two abrasive surfaces, producing uniform particle sizes. Consistent grind = consistent extraction = better coffee.
You don't need to spend a fortune. A decent hand burr grinder can be found for $30-50 and will dramatically improve your cup.
The Bottom Line
Match your grind to your brew method, use fresh beans, and grind right before brewing for the best results. It sounds like a lot, but once you dial it in, it becomes second nature.
At Righteous Roast, all our coffees are available in whole bean, standard grind, coarse grind, and espresso grind — so you can get exactly what you need for your setup. Free shipping in the US, always.