What grind size for French press?

For French press, aim for a coarse grind around 900-1100 µm — close to coarse sea salt or fine breadcrumbs. That size lets water flow freely through the metal mesh without clogging, and keeps sediment and over-extraction in check over the 4-minute steep. Too fine and you get muddy sludge; too coarse and the cup turns thin and sour.

French press is the coarsest method among common brewers, short of cold brew. The reason is physical: a fine metal mesh (typically 30-50 µm aperture) does not stop particles below 100-200 µm. If the grind contains too many fines (<300 µm), those particles slip into the cup and keep brewing after the press, bringing bitterness and astringency. A coarse grind calibrated around 1000 µm minimises that effect while still offering enough surface area for a proper 4-minute extraction.

Classic ratio is 1:15 to 1:17 (60-65 g per litre, water at 93-96 °C). Extraction goes by full immersion: pour water in one go to flood the bed, stir gently so every grain is wetted, cover, wait four minutes. Then break the floating crust with a spoon, lift off foam and floaters, wait another 5 minutes to let the heaviest fines settle, and press the plunger slowly over 15-20 seconds — too fast a press would push fines through the mesh.

Grinder quality is the bottleneck for most home brewers. A blade grinder fragments beans unevenly, producing both large pieces that under-extract and fines that over-extract and muddy the cup. An entry-level burr grinder (Baratza Encore, Wilfa Svart, OXO Brew) gives acceptable French press grounds. Manual grinders like the Comandante C40 or 1Zpresso JX step up uniformity. Dedicated espresso grinders (Eureka Mignon, Mazzer Mini) can do French press too, though switching settings between uses costs time.

One technique that changes the cup: the so-called Hoffmann method (from UK barista champion James Hoffmann), widely adopted since 2015 in specialty circles, calls for a slightly finer grind than tradition (around 800 µm versus 1100) combined with an extra 5-8 minute wait before pressing, letting fines settle naturally. The cup comes out strikingly clean, almost V60-like, without losing French press body. In Belgium, where French press remains a family-breakfast classic, the technique spreads in households that buy fresh specialty coffee from Brussels or Ghent roasters and rediscover the method through a specialty lens.

French press grind — parameters