The French press ratio that works is 1:15, coffee to water by weight: 30 grams of coarse-ground coffee to 450 grams of water for a standard 3-cup press, or 60 grams to 900 grams for the big 34 oz Chambord. That sits inside the Specialty Coffee Association's Golden Cup range (roughly 55 grams per liter, or 1:15 to 1:18), and it errs slightly strong because the press's metal screen lets body through that paper filters strip. No scale? A level tablespoon holds 5 to 6 grams, so the 3-cup press takes 5 to 6 tablespoons.
The ratio table, by press size
| Press size | Coffee (1:15) | Water | Tablespoons (approx) |
|---|---|---|---|
| 12 oz (3-cup) | 23g | 350g | 4 |
| 17 oz (4-cup) | 33g | 500g | 6 |
| 34 oz (8-cup) | 60g | 900g | 11 |
| 51 oz (12-cup) | 90g | 1350g | 16 |
Numbers scale linearly from the SCA target; tablespoon counts are rounded from 5.5g per level tablespoon of medium-coarse grounds.
Adjusting from 1:15, one move at a time
Too strong or muddy: go to 1:16 or 1:17 by adding water, not by removing steep time. Too weak but clean: add coffee, keep everything else fixed; weak-but-balanced is a dose problem, not a time problem. Sour: that is under-extraction, not ratio; steep the full 4 minutes and check your grind against our sour coffee fix table. The one-variable discipline is the same everywhere in coffee, and the free brew ratio card puts every method's numbers on one printable page.
The rest of the recipe (ratio is half the brew)
Coarse grind like sea salt flakes, water just off the boil, 4 minutes of steep, then press slowly and pour everything out immediately; coffee sitting on the grounds keeps extracting into bitterness. If grounds sludge through the screen, the grind is too fine or the screen is worn, both covered in our French press troubleshooting guide. And if the press itself is the weak link, the best French press guide ranks the three worth owning.
Related reading
FAQ
What is the best coffee-to-water ratio for a French press? 1:15 by weight (30g coffee to 450g water for a 3-cup press), inside the SCA Golden Cup range. Adjust one step toward 1:16 or 1:17 if it drinks too heavy.
How many tablespoons of coffee for a French press? About one level tablespoon (5 to 6g) per 75g of water: 4 for a small press, 11 for the 34 oz size.
How long should French press coffee steep? 4 minutes as the baseline. Shorter reads sour, much longer reads bitter; fix strength with dose, not with extra minutes.
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