Coffee Brewing Calculator

Coffee brewing comes down to a ratio between coffee and water, a temperature, a brew time, and a grind size, and each brewing method has its own established range for all four. Presets for each method draw from Specialty Coffee Association (SCA) guidelines and peer-reviewed extraction research: Pour Over (V60) uses a 1:16 ratio at 96 degrees Celsius with a medium-fine grind, French Press uses 1:15 at 93 degrees with a coarse grind, Espresso uses 1:2 at 93 degrees with a fine grind, and Cold Brew uses 1:8 at room temperature with a coarse grind. The SCA golden cup standard recommends approximately 1:16.67 for filter coffee generally.

Coffee amount, in grams, is multiplied by the water ratio to determine total water volume. The ratio's water number sets extraction strength: a higher number produces a lighter brew, and a lower number produces a stronger concentrate. Water temperature matters because most hot brewing methods extract optimally between 90 and 96 degrees Celsius (194 to 205 degrees Fahrenheit), while cold brew works at room or refrigerator temperature instead. Grind size follows brew time: a finer grind increases extraction surface area and suits shorter brew times, while a coarser grind reduces bitterness across the longer immersion times used by methods like French press or cold brew. Milk, cream, syrup, sugar, water, or any other addition adds to the total beverage volume beyond the brewed coffee itself.

Switching methods reloads that method's full preset in one step, ratio, temperature, brew time, and grind together, rather than requiring each value to be reset by hand, and that auto-preset behavior can be turned off in Settings for someone deliberately mixing parameters from two different methods. A step-by-step breakdown is also available there, showing the ratio arithmetic and the water-volume derivation that produced the displayed result.

A V60 pour-over with 20 grams of coffee at the standard 1:16 ratio needs 20 x 16 = 320 grams of water. Shifting to the bolder 1:15 ratio for the same 20 grams instead needs 20 x 15 = 300 grams, a smaller volume producing a stronger cup from the same dose.

Brewing ratios and parameters vary across methods, bean origins, roast levels, and personal taste. Anchoring recommendations to published extraction science removes guesswork and provides a verified baseline for every adjustment.

• Home Barista: Dial in a V60 pour-over starting with the SCA-recommended 1:16 ratio at 96 degrees Celsius, then shift to 1:15 for a bolder cup or 1:17 for a lighter profile. Track the exact water weight needed for 20 grams of a single-origin Ethiopian bean.
• Cafe Preparation: Standardize batch drip recipes across shifts: 60 grams of coffee at a house 1:16 ratio needs 960 milliliters of water. Adding 200 milliliters of steamed milk for latte-style service drinks gives the total serving volume.
• Cold Brew Production: Scale a 1:8 concentrate ratio for a 1-liter overnight steep: 125 grams of coarsely ground coffee needs the full 1000 milliliters of room-temperature water. Dilution water or milk added as separate ingredients plans the finished serving volume.
• Espresso Calibration: Verify that 18 grams of coffee at a 1:2 ratio targets a 36-gram yield. Adjusting the ratio to 1:2.5 for a lungo shot shows the resulting liquid weight, alongside grind size and temperature changes.
• Turkish Coffee Ritual: The traditional 1:10 ratio with an extra-fine grind confirms 7 grams of coffee needs 70 milliliters of water; 5 grams of sugar added as a custom ingredient gives the total cezve volume before heating.
• AeroPress Experimentation: Compare a standard 1:12 ratio with competition recipes that push to 1:6 for a concentrate diluted post-brew, switching between 15-gram and 20-gram doses to observe how water volume changes.
• Meal Planning: Prepare multiple servings from a total coffee weight for a group: eight guests at 12 grams each equals 96 grams of coffee, which needs 1536 milliliters of water at a 1:16 ratio.