French Press Coffee Ratio Calculator
Use this French press ratio calculator to weigh the right amount of coffee and water for a rich, full-bodied brew. Enter your coffee dose or the water your press holds, choose a strength, and get both numbers — no guesswork, no weak or muddy coffee.
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Calculate your French press coffee and water
Enter values above and press Calculate to see your result.
Formula used
French press uses a simple coffee-to-water ratio, written 1 : N:
Water (g) = Coffee (g) × NCoffee (g) = Water (g) ÷ N
Because the metal filter lets oils and fine particles through, French press tastes heavier than paper-filtered coffee at the same ratio. A range of 1:14 to 1:16 suits most people; many recipes use 1:15.
The grounds soak up roughly 2 ml of water per gram, so the coffee you pour out is a little less than the water you added.
Worked examples
One large press. A standard 1-litre (8-cup) press at 1:15 needs about 67 g of coffee to 1000 g of water.
Two mugs. Starting from 60 g of coffee at 1:15 gives 900 g of water, enough for roughly two to three servings.
Stronger brew. Keep 60 g but use 1:13 for 780 g of water and a bolder cup.
How to use this calculator
- Decide whether to start from your coffee dose or your press / water size.
- Enter the amount in grams (water in millilitres works too).
- Choose a brew ratio — 1:15 is a reliable starting point.
- Press Calculate for your coffee and water weights.
- Use a coarse grind, steep about 4 minutes, then press slowly.
French press ratio by press size
Approximate coffee for common press capacities at three strengths.
| Press size | Water | Coffee at 1:13 (strong) | Coffee at 1:15 (balanced) | Coffee at 1:17 (light) |
|---|---|---|---|---|
| 3-cup (350 ml) | 350 g | 27 g | 23 g | 21 g |
| 4-cup (500 ml) | 500 g | 38 g | 33 g | 29 g |
| 8-cup (1000 ml) | 1000 g | 77 g | 67 g | 59 g |
| 12-cup (1500 ml) | 1500 g | 115 g | 100 g | 88 g |
“Cups” on a French press are about 120 ml each, smaller than a mug.
Who should use this calculator
Anyone who brews with a cafetière / French press and wants a consistent, full-bodied cup. It is ideal for scaling between a single mug and a full press, and for matching the coffee to whatever press size you own.
What each input means
- Start from — pick coffee dose if you measure beans first, or water/press size if you fill to a line.
- Amount — grams of coffee or millilitres of water (≈ grams).
- Brew ratio — water per gram of coffee; lower is stronger.
How to read your result
The result gives the coffee and water to use plus the approximate liquid you will pour off. Because the metal mesh keeps almost nothing back except the bed of grounds, French press yields close to the water you add, minus what the grounds retain.
Common mistakes to avoid
- Grinding too fine. Fine grounds slip through the mesh and make the cup muddy and bitter. Use a coarse grind.
- Leaving the plunger down. Decant the coffee after pressing so it does not keep extracting and turn bitter.
- Counting press ‘cups’ as mugs. A press cup is about 120 ml, not a full mug.
Limitations of this calculator
This estimates weights only. Final taste depends on grind coarseness, water temperature (around 93–96 °C), steep time (about 4 minutes) and how cleanly you press. Treat the output as an accurate recipe to start from.
Frequently asked questions
What is the best ratio for French press coffee?
1:15 (15 g water per gram of coffee) is a balanced starting point. Use 1:12–1:13 for a strong brew or 1:16–1:17 for a lighter one.
How much coffee for an 8-cup French press?
An 8-cup (1-litre) press holds about 1000 ml of water, so roughly 67 g of coffee at 1:15. Enter 1000 as the water amount to get an exact figure.
Why is my French press coffee muddy?
Usually the grind is too fine, letting fines through the metal mesh. Switch to a coarse grind and let the grounds settle before plunging slowly.
How long should French press steep?
About four minutes is standard. Break the crust and skim, then press gently and decant straight away.
Is French press stronger than drip coffee?
At the same ratio it tastes heavier and fuller because the metal filter lets oils and fine particles through, but the actual strength still comes from your ratio.