How to Make French Press Coffee: Ratio, Time and Technique
The short answer to how to make French press coffee is this: add coarsely ground coffee to the carafe, brew with 90–96°C (195–205°F) water at a ratio between 1:12 and 1:17, place the plunger, close the lid, wait 4 minutes, then press down slowly and serve right away. Once the ratio, temperature and brew time are right, you can easily get the full-bodied, rich cup that French press is known for; the steps below work whether you're trying it for the first time or brewing it daily.
The right ratio and a coarse grind
Ratio comes down to preference in French press: sources suggest a range between 1:12 and 1:17 — 1:12 gives a stronger, fuller-bodied cup, while 1:17 gives a lighter, cleaner one; a safe starting point for most people sits around 1:14–1:15 in the middle. The grind must be coarse: on the Grind Guide page's scale, French press corresponds to a grind described as 'coarse sea salt,' even coarser than the medium-coarse grind recommended for metal or paper filter coffee. If you use a fine grind, the metal mesh under the plunger can't hold back the fine particles, sediment settles at the bottom of the cup, and extraction speeds up into a bitter taste. If you have your own grinder, buying whole beans from Kimor's filter coffee line and grinding on a coarse setting right before brewing gives a fresher, more controlled result than pre-ground coffee. Freshly roasted beans release more carbon dioxide during brewing, so you'll see a thicker foam on the surface right after pouring the water; as that foam thins out over successive brews, it's also a sign of how long it's been since the beans were roasted. If the same ratio and grind give you a different cup from one day to the next, it makes sense to check the freshness of the beans first and the grinder's calibration second.
Water temperature and brew time
Water temperature should sit just below boiling: it's recommended that the water's temperature at the moment it touches the coffee be around 93°C (200°F), and that boiling water rest for about a minute before being poured over the coffee; in practice, this resting brings the water down into the 90–96°C range. Lower temperatures lead to a sour, under-extracted cup, while boiling water leads to a bitter, scorched taste. After adding the coffee to the carafe, pour in the water and wait about 30 seconds, gently stirring the foam that forms on top with a long spoon; this step lets gas escape and helps the brew extract evenly. Total brew time is usually around 4 minutes; the longer it steeps, the more the coffee releases, so tracking the minutes with a timer gives a more consistent result than guessing by eye. Measuring water temperature with a kitchen thermometer is the most reliable method; without one, letting the water rest for a minute after boiling gives a similar result on most home stoves. Coffee brewed with hard, mineral-heavy water can taste duller and flatter, so if your tap water smells or tastes of chlorine, running it through a carbon filter improves the clarity of the cup.
Step-by-step French press brewing
First warm the carafe and plunger by rinsing them with hot water; a cold glass or steel carafe lowers the brewing temperature. Weigh your coffee on a kitchen scale and grind it on a coarse setting; eyeballing the amount leads to a cup that changes from day to day. Add the ground coffee to the carafe, pour in all of your target water and wait 30 seconds, then gently stir the foam on the surface with a long spoon. Place the plunger on top without pressing down, close the lid and start a 4-minute timer. When the time is up, press the plunger down with a slow, steady pressure; pressing too fast pushes sediment back up and results in a cloudy cup. Pour the coffee into a separate carafe or cup right away; if you leave it in the carafe, the coffee under the plunger keeps brewing and the cup becomes over-extracted and bitter over time. Don't leave the poured cup sitting on a hot plate or stove for long; since the coffee under the plunger keeps extracting slowly, the second cup from the same carafe will taste more bitter than the first.
Common mistakes and how to fix them
The most common problem is a cloudy, sediment-heavy cup; it's usually caused by a grind that's finer than it should be or by pressing the plunger too fast — coarsening the grind and slowing down the press is usually enough to fix it. If the brewing water is poured in too fast and unevenly, the coffee doesn't wet evenly, which leaves some grounds under-extracted and others over-extracted; pouring slowly in a circular motion reduces this unevenness. The second problem is a weak, watery cup; pulling the ratio from 1:17 toward 1:14–1:15, or extending the brew time by about 30 seconds, strengthens the cup. The third problem is coffee being forgotten in the carafe after brewing and becoming over-extracted; it helps to make a habit of pouring the coffee into a separate container as soon as it's done brewing. Rinsing the metal mesh with warm water after every brew also matters; dried fine particles left in the mesh can add a bitter note to the next brew. Freshly ground coffee makes an especially noticeable difference in French press, because the method doesn't use a paper filter, so the coffee's oils and fine particles pass into the cup unfiltered; this makes both the body and the effect of freshness (or staleness) more pronounced. How you store your beans also affects the result: the How to Store Coffee Beans article explains the right container and conditions, which matters especially for French press since the method carries the coffee's oils straight into the cup without filtering them out.