How fine should coffee be ground for pour over?

Achieving the perfect cup of pour-over coffee is a delicate dance between grind size, water temperature, and contact time. The goal is to extract the desirable sugars and acids while leaving behind the harsh, astringent compounds that can ruin a brew. A medium-fine grind is the starting point for most pour-over methods, such as the V60 or Kalita Wave, because it provides enough surface area for efficient extraction without clogging the filter or stalling the draw-down time.

In practice, your grind size should be adjusted based on the specific coffee you are using. Denser, high-altitude beans often require a slightly finer grind to ensure proper extraction, while darker roasts—which are more porous and soluble—may benefit from a slightly coarser setting to avoid bitterness. If your coffee tastes sour or thin, your grind is likely too coarse, allowing water to pass through too quickly without picking up enough flavor. Conversely, if your coffee tastes bitter, dry, or 'hollow,' your grind is likely too fine, leading to over-extraction.

Beyond the initial setting, the brewing technique itself plays a role. If you are using a method that involves multiple pours or a longer bloom phase, you may need to adjust your grind to compensate for the total contact time. The bloom, in particular, is a great indicator of your grind quality; a fresh, medium-fine grind should allow the coffee to expand evenly as it releases carbon dioxide. If the bed of grounds looks muddy or uneven after the brew, it is a sign that your particle distribution is inconsistent.

Ultimately, the best way to find your ideal setting is to keep your other variables—like water temperature and brew ratio—constant while you adjust your grind. Start with a medium-fine baseline and make small, incremental changes. By focusing on the balance of sweetness and acidity, you will eventually find the setting that makes your specific beans shine. Remember that the goal is not just to follow a rule, but to use the grind size as a tool to manipulate the flavor profile of your coffee.