Coffee Brewing Ratio Calculator

Find the perfect coffee-to-water ratio for any brew method. Get precise measurements in seconds.

1. Choose Brew Method
2. Adjust Strength
StrongerStandardMilder
1 : 15
3. Enter Amount
Or Calculate by Cups
☕ Your Brew Recipe
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Grams of Coffee
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ml of Water
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Grind Size
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Brew Time
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Water Temp
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Ratio
Coffee
Water

Coffee Brewing Ratios by Method

Every brewing method extracts coffee differently. Use this reference table to find the ideal starting ratio, then adjust to your taste using the calculator above.

Brew MethodRatioCoffeeWaterGrindBrew TimeTemp
V60 Pour Over1:1518g270mlMedium-Fine2:30-3:00200-205°F
Chemex1:1625g400mlMedium-Coarse3:30-4:30200-205°F
French Press1:1230g360mlCoarse4:00200°F
AeroPress1:1217g204mlMedium-Fine1:30-2:00185-205°F
Cold Brew1:5100g500mlExtra Coarse12-24 hrsRoom/Cold
Espresso1:218g36mlVery Fine25-30s200°F
Moka Pot1:720g140mlFine3:00-5:00Stovetop
Drip Machine1:1630g480mlMedium4:00-6:00195-205°F

How to Use This Coffee Ratio Calculator

  1. Select your brew method from the 8 options above. Each method has a scientifically recommended default ratio based on optimal extraction.
  2. Adjust the strength slider to your preference. Moving left makes it stronger (less water per gram of coffee), and moving right makes it milder. The ratio updates in real time.
  3. Enter your coffee or water amount. Type in how many grams of coffee you have, or how many ml of water you want to use. The calculator instantly computes the other value.
  4. Or use the cups calculator. Select how many cups you want and your preferred cup size (6oz, 8oz, or 12oz). The calculator handles the conversion for you.
  5. Read your complete recipe including grams, ml, grind size, brew time, and water temperature. Use the "Copy Recipe" button to save or share your brew parameters.

Coffee Brewing Tips from Baristas

Common Coffee Brewing Mistakes

Using Boiling Water

Water at 212°F scalds the coffee grounds, extracting harsh, bitter compounds. Always wait 30-60 seconds off the boil, aiming for 200-205°F for most methods.

Eyeballing Measurements

A "scoop" of coffee can vary by 30-50% depending on grind size and how you fill it. Invest in a $10 kitchen scale for consistent, repeatable brews every single time.

Wrong Grind Size

Using espresso-fine grounds in a French press causes over-extraction and bitterness. Using coarse grounds in an AeroPress causes under-extraction and sourness. Match grind to method.

Stale Coffee Beans

Coffee is best 7-21 days after roasting. Pre-ground supermarket coffee lost most of its flavor months ago. Buy whole beans from a local roaster and grind fresh for each brew.

Incorrect Ratio

Too much water makes watery, flavorless coffee. Too little water makes an intensely bitter brew. Use the calculator above to dial in the exact ratio for your preferred method.

Not Pre-wetting the Filter

Paper filters can impart a papery taste. Rinse your filter with hot water before adding coffee. This also pre-heats the brewer, maintaining consistent water temperature during extraction.

Frequently Asked Questions

What is the standard coffee-to-water ratio?
The standard coffee-to-water ratio recommended by the Specialty Coffee Association (SCA) is 1:18 (about 55g of coffee per liter of water). However, most coffee enthusiasts prefer a slightly stronger ratio of 1:15 to 1:17 depending on the brew method and personal taste. For pour over, 1:15 to 1:16 is common. For French press, 1:12 to 1:15 is typical. For cold brew concentrate, 1:5 to 1:8 is standard. Use the calculator above to experiment and find your perfect ratio.
How much coffee do I need for 1 cup?
For a standard 8oz (237ml) cup of coffee, you need about 15g of ground coffee using a 1:16 ratio. For a stronger cup, use 18-20g (1:12 ratio). For a milder cup, use 12-13g (1:18 ratio). Keep in mind that a "cup" on most drip coffee makers is actually 6oz (177ml), not 8oz, so you would need about 11g of coffee per 6oz cup at a 1:16 ratio. The calculator above lets you choose your cup size and number of cups to get precise measurements.
What is the best ratio for pour over coffee?
The best ratio for pour over coffee is 1:15 to 1:16 (one part coffee to 15-16 parts water). For a V60, start with 1:15 using 18g of medium-fine ground coffee and 270ml of water at 200-205°F (93-96°C). For Chemex, use a slightly coarser grind with a 1:16 ratio due to the thicker filter paper. The total brew time should be 2.5 to 4 minutes. If your brew tastes sour, try grinding finer; if it tastes bitter, grind coarser. Adjust the ratio stronger or milder using the strength slider above.
Why does grind size matter for coffee brewing ratios?
Grind size directly affects extraction rate and therefore how your coffee tastes at any given ratio. A finer grind exposes more surface area, extracting faster and producing a stronger, potentially bitter taste. A coarser grind extracts slower, producing a lighter, potentially sour taste. Each brew method requires a specific grind size: espresso uses very fine (like table salt), pour over uses medium-fine, French press uses coarse (like sea salt), and cold brew uses extra coarse. Using the wrong grind size can make even the correct ratio taste off. The calculator above shows the recommended grind size for each method.
How do I make cold brew concentrate at home?
To make cold brew concentrate, use a 1:5 ratio (1 part coarsely ground coffee to 5 parts cold or room temperature water). For example, use 100g of coffee with 500ml of water. Stir to combine, cover, and steep in the refrigerator for 12-24 hours. Strain through a fine mesh sieve or cheesecloth. The resulting concentrate should be diluted 1:1 with water, milk, or ice before drinking. Cold brew concentrate keeps in the fridge for up to 2 weeks. Select "Cold Brew" in the calculator and use the strength slider to adjust between concentrate and ready-to-drink ratios.