Coffee Ratio Calculator: Find Your Perfect Coffee-to-Water Ratio

Coffee ratio is the single most controllable variable in making better coffee at home. The grind, the beans, the water temperature — those all matter, but if your ratio is off, nothing else saves it. The CalcHub Coffee Ratio Calculator gives you the exact grams of coffee for however much water you're using, across any brew method.

The Golden Ratio

The SCA (Specialty Coffee Association) standard is 1:15 to 1:17 (1 gram of coffee per 15–17 grams of water) for most filter coffee methods. A 1:15 ratio is stronger; 1:17 is lighter. Most people prefer somewhere in the middle.

For reference: 1 cup of water = approximately 237 mL = 237 grams.

Ratios by Brew Method

Brew Method	Ratio (coffee:water)	For 300 mL water	For 600 mL water
Pour-over (V60, Chemex)	1:15–1:16	18.75–20 g coffee	37.5–40 g coffee
Drip coffee maker	1:15–1:17	17.6–20 g coffee	35–40 g coffee
French press	1:12–1:14	21–25 g coffee	42–50 g coffee
AeroPress	1:10–1:15	20–30 g coffee	varies
Cold brew (concentrate)	1:4–1:6	50–75 g coffee	100–150 g coffee
Cold brew (ready to drink)	1:8–1:12	25–37.5 g coffee	50–75 g coffee
Espresso	1:1.5–1:3	—	Per shot: 18–20 g in
Moka pot	1:8–1:10	30–37.5 g coffee	fills the basket

French press uses a higher coffee-to-water ratio because no paper filter is used, so fine particles remain in the cup — a coarser grind and slightly higher ratio compensates.

Using the Calculator

Enter your target cup volume (or number of cups) and select your brew method. The calculator outputs:

• Grams of coffee needed
• Tablespoon equivalent (for those without a scale)
• Water temperature recommendation
• Approximate brew time

Use a scale. Tablespoons vary too much based on grind size, tamping, and measurement method. A scale is the single best upgrade to your coffee routine.

Adjusting for Taste

The calculated ratio is a starting point. Adjust from there:

If coffee is...	Try...
Too bitter	Lower ratio (more water), coarser grind, lower temp
Too sour/acidic	Higher ratio (less water), finer grind, higher temp
Weak and thin	Higher ratio, finer grind
Flat and dull	Fresher beans, water temperature 195–205°F

Small changes make big differences. Move the ratio in 0.5-point steps (e.g., 1:15 → 1:15.5) before making other changes.

Water Temperature by Method

Brew Method	Optimal Water Temp
Pour-over	195–205°F (90–96°C)
French press	195–205°F
Espresso	195–200°F
Cold brew	Room temperature or cold (never heated)
AeroPress	175–205°F (variable by preference)

Do I need different ratios for light vs. dark roast?

Light roasts are denser and require a slightly finer grind or slightly more coffee to achieve the same extraction level as a dark roast. A 1:15 ratio that's perfect for a dark roast might taste weak with a light roast — try 1:14 or 1:13.5.

My coffee maker has cup markings — how do those relate to this?

Most coffee maker "cups" are 5–6 oz, not 8 oz. A 12-cup machine brews about 60 oz, not 96 oz. The calculator lets you enter ounces or mL directly to avoid this confusion.

Is there a ratio for iced coffee?

For Japanese iced pour-over (brewing directly onto ice): use a 1:15 total liquid ratio but split it roughly 60% hot water + 40% ice. The ice melts during brewing and makes up the remaining water. The calculator handles this split automatically in iced mode.

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