What is the best ratio for French press?

The French press is an immersion brewing method, meaning the coffee grounds are fully submerged in water for the duration of the brew. Because of this, the French press produces a cup with a heavy, rich body and a distinct mouthfeel, as the metal mesh filter allows more of the coffee's natural oils and fine particles to pass into the final cup. The ratio you choose is the primary lever for controlling this intensity.

A 1:15 ratio will yield a bold, punchy cup that stands up well to milk or cream. A 1:17 ratio will result in a cleaner, more nuanced cup that highlights the delicate flavor notes of a single-origin bean. Most home brewers find their 'sweet spot' somewhere in between. Start with 1:16—a classic middle ground—and adjust from there. If the coffee feels too weak or watery, move toward 1:15; if it feels too intense or overwhelming, move toward 1:17.

Consistency is the secret to great French press coffee. Using a scale to measure your coffee and water by weight is far more accurate than using scoops or tablespoons. Because coffee beans vary in density, a 'scoop' can contain vastly different amounts of coffee depending on the roast level and origin. By using a scale, you ensure that your recipe is repeatable, allowing you to make small, informed adjustments to your grind size or brew time.

Grind size is also critical for the French press. Because the immersion time is relatively long (usually 4 minutes), you need a coarse grind, similar to sea salt or breadcrumbs. If your grind is too fine, the coffee will over-extract, leading to a bitter, muddy, and astringent cup. If it is too coarse, the water won't extract enough flavor, and the coffee will taste thin and sour. A high-quality burr grinder is essential here to ensure that your coarse grind is uniform.

In practice, the French press is a forgiving and versatile brewer. Once you have your ratio and grind size dialed in, you can experiment with brew time and water temperature. Don't be afraid to let the coffee steep for a bit longer if you want more body, or to use slightly cooler water if you find your coffee is tasting too bitter. The beauty of the French press is that it allows you to customize your cup to your exact taste.