What is the best grind size for pour-over?

Achieving the perfect cup of pour-over coffee is a delicate dance between grind size, water temperature, and contact time. Because pour-over brewing relies on gravity to pull water through a bed of coffee grounds, the grind size acts as the primary 'throttle' for extraction. If the particles are too large, water passes through too quickly, resulting in an under-extracted, sour, and thin cup. If they are too small, the water stalls, leading to over-extraction and a bitter, astringent taste.

For most standard pour-over devices like the Hario V60 or Chemex, a medium-fine grind is the gold standard. Think of the consistency of sea salt. This size provides enough surface area for the water to dissolve the desirable sugars and acids, while maintaining enough permeability to allow the water to drain within the ideal window of 2.5 to 4 minutes. However, this is not a rigid rule; it is a starting point.

Your specific equipment and the coffee itself will dictate adjustments. For example, a Chemex uses a much thicker paper filter than a V60, which naturally slows down the flow of water. Consequently, you might need to grind slightly coarser for a Chemex to prevent the brew from taking too long. Conversely, if you are brewing a very light-roast, high-density bean, you may need a slightly finer grind to help extract those complex, delicate flavors.

In practice, you should use your taste buds as your primary guide. If your coffee is consistently tasting bitter or 'dry' on the tongue, try adjusting your grinder one or two clicks toward a coarser setting. If the coffee lacks sweetness and feels hollow or sour, move your grind size finer. Consistency is key, so once you find the setting that produces a balanced, sweet, and clean cup, stick with it for that specific coffee.

Remember that your grinder quality matters immensely. A burr grinder is essential for pour-over because it produces uniform particle sizes. A blade grinder, by contrast, creates a mix of boulders and dust, which leads to uneven extraction—some parts of your coffee will be over-extracted while others remain under-extracted. Investing in a quality burr grinder is the single most effective way to improve your home brewing results.