Grind Science

Grind size is the single variable that affects every cup of coffee you make, regardless of brew method. Get it right and extraction is balanced — sweet, clear, and consistent. Get it wrong and no amount of adjusting your ratio, temperature, or technique will fix it.
This section covers the science behind why grind size matters and how to use it to your advantage. You’ll find a complete grind size reference chart spanning every major brew method from cold brew to espresso, a deep explanation of how particle size controls extraction rate and flavor, and method-specific dial-in guides that tell you exactly where to start and how to adjust from there.
There’s also a practical breakdown of grinder types — burr vs blade, manual vs electric — so you understand not just what to grind, but what to grind it with and why the tool matters as much as the setting.
If your coffee tastes off and you’re not sure why, grind size is almost always the right place to look first. Start here.