French Press: Full Immersion Brewing

The French press (also called a cafetière or press pot) uses full immersion — coffee grounds steep in hot water for the entire brew time. Unlike pour-over, where water passes through quickly, immersion gives the water prolonged contact with the coffee, producing a full-bodied, rich cup.

The Golden Ratio

The recommended coffee-to-water ratio for French press is:

1 : 15 \quad \text{(grams of coffee : grams of water)}

For a standard 34 oz (1 liter) French press:

\frac{1000 \text{ g water}}{15} \approx 67 \text{ g coffee}

Press size	Water	Coffee (1:15)	Coffee (1:12 strong)
12 oz / 350 ml	350 g	23 g	29 g
17 oz / 500 ml	500 g	33 g	42 g
34 oz / 1 L	1000 g	67 g	83 g
51 oz / 1.5 L	1500 g	100 g	125 g

Brewing Parameters

Grind Size

Coarse — like sea salt. Fine grinds over-extract and pass through the mesh filter, creating a muddy cup.

Water Temp

195–205°F (90–96°C). Just off the boil. Too hot scorches the coffee; too cool under-extracts.

Steep Time

4 minutes is standard. Shorter = under-extracted (sour); longer = over-extracted (bitter).

Extraction Science

Coffee extraction is the percentage of solubles dissolved from the grounds into the water. The target is $18\text{–}22\%$ extraction:

\text{Extraction} = \frac{\text{mass dissolved}}{\text{mass of dry coffee}} \times 100\%

Below 18%, coffee tastes sour and thin (under-extracted). Above 22%, it becomes bitter and astringent (over-extracted). The coarse grind, moderate temperature, and 4-minute steep of French press are calibrated to hit this window.

Frequently Asked Questions

What is the ideal coffee-to-water ratio for French press?

The recommended ratio is 1:15 (grams of coffee to grams of water). For a standard 34 oz (1 liter) French press, use about 67 g of coarsely ground coffee. For a stronger cup, try 1:12; for a lighter cup, use 1:17.

How long should French press coffee steep?

Steep for 4 minutes. Shorter steeping (under 3 minutes) results in sour, under-extracted coffee. Longer steeping (over 5 minutes) produces bitter, over-extracted flavors. Use a timer for consistency.

What grind size should I use for French press?

Use a coarse grind, similar to the texture of sea salt. Fine grinds over-extract during the long steep time and pass through the mesh filter, creating a muddy, gritty cup.

What water temperature is best for French press?

Use water at $195\text{--}205^\circ\text{F}$ ( $90\text{--}96^\circ\text{C}$ ), which is just off the boil. Water that is too hot scorches the coffee and produces bitterness. Water below $195^\circ\text{F}$ under-extracts, resulting in a weak, sour cup.

Why is French press coffee stronger than drip?

French press uses full immersion brewing with a metal mesh filter that allows oils and fine particles to pass through, producing a fuller body. Drip coffee uses paper filters that absorb oils. French press also typically uses a stronger ratio (1:15) than drip (1:16 to 1:18).

French Press Coffee Calculator

Calculate the ideal coffee-to-water ratio for your French press. Enter press size or number of mugs, choose strength, get amounts in grams, tablespoons, and scoops.

Try an Example

Morning Drip Coffee

Espresso Double Shot

Cold Brew Concentrate

V60 Pour-Over

Calculate Your Perfect Brew

Related purpose Variants

Cold Brew

Pour Over

Espresso

Drip

Scoop

More Food & Nutrition Calculators

Try an Example

Morning Drip Coffee

Espresso Double Shot

Cold Brew Concentrate

V60 Pour-Over

Calculate Your Perfect Brew

French Press: Full Immersion Brewing

The Golden Ratio

Brewing Parameters

Grind Size

Water Temp

Steep Time

Extraction Science

Frequently Asked Questions

What is the ideal coffee-to-water ratio for French press?

How long should French press coffee steep?

What grind size should I use for French press?

What water temperature is best for French press?

Why is French press coffee stronger than drip?

French Press Coffee Calculator

Calculate the ideal coffee-to-water ratio for your French press. Enter press size or number of mugs, choose strength, get amounts in grams, tablespoons, and scoops.

Try an Example

Morning Drip Coffee

Espresso Double Shot

Cold Brew Concentrate

V60 Pour-Over

Calculate Your Perfect Brew

Related purpose Variants

Cold Brew

Pour Over

Espresso

Drip

Scoop

More Food & Nutrition Calculators

Calculator Search

Try an Example

Morning Drip Coffee

Espresso Double Shot

Cold Brew Concentrate

V60 Pour-Over

Calculate Your Perfect Brew

French Press: Full Immersion Brewing

The Golden Ratio

Brewing Parameters

Grind Size

Water Temp

Steep Time

Extraction Science

Frequently Asked Questions

What is the ideal coffee-to-water ratio for French press?

How long should French press coffee steep?

What grind size should I use for French press?

What water temperature is best for French press?

Why is French press coffee stronger than drip?