How to Make French Press Coffee: Ratio, Grind, and Timing
How to Make French Press Coffee
To make french press coffee, weigh out coarse-ground coffee at this publication's 1:15 starting ratio — 30 grams of coffee for every 450 grams (about 15 ounces) of water. Pour water heated to 195–205°F (91–96°C) over the grounds, stir once, set the lid on with the plunger up, and steep for 4 minutes. Then press slowly and pour immediately.
That one paragraph is the whole recipe. Everything below explains the numbers — why the grind is coarse, why 4 minutes, and how to adjust when the cup isn't quite right.
What You Need
- A french press (any size — the recipe scales by weight)
- A kitchen scale that reads in grams
- A burr grinder, or coarse pre-ground coffee
- A kettle, ideally with a thermometer or temperature setting
- A timer (your phone works fine)
The scale matters more than anything else on this list. Scoops and tablespoons vary wildly with grind size and bean density; grams don't. If you want the arithmetic behind that, our coffee to water ratio guide walks through it in detail.
The French Press Ratio: 1:15
A 1:15 ratio means one gram of coffee for every 15 grams of water. It is this publication's strong starting point, not a universal standard. Our practical adjustment window is 1:15 to 1:18. A tighter ratio uses more coffee and raises beverage strength without changing the 4-minute contact time.
Published recipes differ. A Specialty Coffee Association technical article uses 60 grams per liter, equivalent to 1:16.7, as its filter-and-immersion brewing-ratio example. OXO's current 8-cup French press card specifies 52 grams for 946 milliliters, about 1:18.2. Those are reference recipes for defined contexts, not evidence that one number suits every coffee, grinder, or palate.
Calculate any french press ratio
In 1:15 coffee-to-water notation, the first number is coffee and the second is water, both by mass. Use:
coffee grams = water grams ÷ ratio number
For 600 grams of water, 600 ÷ 15 = 40 grams of coffee. At 1:17, 600 ÷ 17 = 35.3 grams, which can be rounded to 35 grams on a whole-gram kitchen scale. Keep the water amount fixed while comparing ratios so strength is the only planned change.
Here's the math recomputed for common press sizes:
| Press size | Water | Coffee (1:15) | Coffee (milder, 1:17) |
|---|---|---|---|
| 3-cup (12 oz) | 350 g | 23 g | 21 g |
| 4-cup (17 oz) | 500 g | 33 g | 29 g |
| 8-cup (34 oz) | 900 g | 60 g | 53 g |
Note that an "8-cup" press holds about a liter to the brim; 900 grams of water leaves room for the grounds and the plunger. Start at 1:15, and if the coffee tastes too intense, stretch toward 1:17 rather than shortening the steep.
Grind Size: Coarse, Like Coarse Sea Salt
French press needs a coarse grind — distinct, chunky particles about the size of coarse sea salt or rough breadcrumbs.
Two reasons:
- Contact time is long. The grounds sit in hot water for 4 full minutes. Fine particles over-extract in that window and turn the cup bitter.
- The filter is metal mesh. Fine grounds slip through it, leaving sludge in the bottom of your mug.
If your coffee tastes bitter and muddy, the grind is almost certainly too fine. If it tastes weak and sour, go one step finer or extend the steep by 30 seconds.
Water Temperature: 195–205°F (91–96°C)
Use 195–205°F (91–96°C) as a repeatable starting range. OXO's French press card gives that Fahrenheit range and 91–96°C. Measure the brewing water, not merely the kettle setting, if you want to know the actual number entering the press.
A fixed 30-second wait after boiling does not guarantee this range: water volume, kettle material, room conditions, and altitude change the result. Without a thermometer, follow the press or kettle manufacturer's method and treat the result as an estimate. If a dark roast tastes harsh, test the next brew near 195–200°F while holding ratio, grind, and time still. If a light roast tastes sharp or underdeveloped, test a warmer brew within the stated range rather than assuming every light roast needs maximum heat.
Step-by-Step: The 4-Minute Method
- Heat your water to 195–205°F. While it heats, grind your coffee coarse.
- Preheat the press with a splash of hot water, swirl, and dump it out. A warm carafe keeps the brew from cooling mid-steep.
- Add the coffee and set the press on your scale. Tare to zero.
- Start the timer and pour all the water in one steady stream, wetting all the grounds. Give it one gentle stir with a spoon.
- Lid on, plunger up. Rest the lid on top without pressing — it holds heat in.
- At 4 minutes, press slowly. Take 15–20 seconds to push the plunger down. If it fights back hard, your grind was too fine.
Set the press on a stable, dry surface, hold it as its manufacturer directs, and keep hands and face away from the spout. Do not force a resistant plunger. Stop and check the grind, filter assembly, and press instructions before trying again; the vessel contains very hot liquid.
- Pour immediately. This is the most-skipped step and the most important one after the ratio: coffee left sitting on the grounds keeps extracting and turns bitter. Decant every cup, or pour the extra into a carafe or thermos.
Troubleshooting the Cup
| The cup tastes... | Likely cause | Fix |
|---|---|---|
| Bitter, harsh | Grind too fine, or left on grounds | Coarsen grind; decant right away |
| Weak, sour | Grind too coarse or water too cool | Grind finer; check temperature |
| Muddy, silty | Fine particles from grinder | Coarsen grind; press more slowly |
| Thin | Ratio too loose | Move from 1:17 toward 1:15 |
Change one variable at a time. The ratio, grind, temperature, and time all interact, and adjusting two at once tells you nothing about which fix worked. If you want a firmer grip on those fundamentals across every method, the guides in Brewing Basics cover each variable on its own.
The Short Version
Coarse grind, 1:15 by weight, 195–205°F water, 4 minutes, press slowly, pour immediately. Master that sequence and the french press becomes the most forgiving brewer in the kitchen — and one of the cheapest routes to a genuinely excellent cup.
Sources checked
- Specialty Coffee Association — Water and Coffee Acidity — used for brewing-ratio notation and its 60 g/L, or 1:16.7, filter-and-immersion example.
- OXO — 8-Cup French Press Recipe Card — used for the current 52 g/946 mL recipe, coarse grind, 195–205°F / 91–96°C water, 4-minute wait, and plunge.
- ESPRO — Ultralight P0 Coffee Brewing Guide — used to confirm that a manufacturer recipe can vary ratio by roast, while retaining coarse grounds, up to 4 minutes, and a slow 15-count press.
- Baratza — French Press Grind Guidance — used for the coarse, even grind and metal-filter context.
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