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Coffee Ratio Calculator computes the amount of water and final coffee volume needed for a specified amount of ground coffee, based on a coffee-to-water ratio.
It is widely used by coffee enthusiasts to achieve the perfect brew strength for various brewing methods.
Input the number of cups, select a coffee-to-water ratio, and specify the ground coffee amount with its unit. The calculator uses the following formulas:
Click 'Calculate' to see the water and final coffee volume in your selected unit.
Example 1: Number of Cups = 1, Ratio = 1:11 (Aeropress), Ground Coffee = 25 tsp (50 g), Output Unit = oz.
Calculation: \( \text{Water} = 50 \times \frac{11}{1} = 550 \, \text{ml} \), in oz: \( 550 \times 0.033814 \approx 18.60 \, \text{oz} \), \( \text{Final Volume} = 550 - (50 \times 1.38) = 481 \, \text{ml} \), in oz: \( 481 \times 0.033814 \approx 16.28 \, \text{oz} \)
Example 2: Number of Cups = 2, Ratio = 1:12 (French Press), Ground Coffee = 41.67 g, Output Unit = cups.
Calculation: \( \text{Water} = 41.67 \times \frac{12}{1} \approx 500 \, \text{ml} \), in cups: \( 500 \times 0.00422675 \approx 2.11 \, \text{cups} \), \( \text{Final Volume} = 500 - (41.67 \times 1.38) \approx 442.51 \, \text{ml} \), in cups: \( 442.51 \times 0.00422675 \approx 1.87 \, \text{cups} \)
Enter values and click 'Calculate' to verify.
Here’s a breakdown of coffee-to-water ratios for different brewing methods:
| Type | Ratio | Comments |
|---|---|---|
| Ristretto | 1:1.5 | The smallest coffee, also called caffè corto. |
| Espresso | 1:2 | Watch out for water loss! To achieve a 1:2 ratio, use 1:3.6 instead. |
| Lungo | 1:3 | 25 s, 88-92°C, results in 25 mL of coffee. |
| Cold Brew | 9:40 | Takes 12-24 h to make! |
| Moka Pot | 1:10 | Coffee from the stovetop. |
| Aeropress | 1:11 | Making one cup at a time. |
| French Press | 1:12 | The easiest to use. |
| V60 | 3:50 | So-called drip coffee. |
| Siphon | 3:50 | Have you ever dreamt of becoming an alchemist? |
| Chemex | 1:17 | Blooming coffee in an hourglass. |
1. What is a coffee-to-water ratio?
The coffee-to-water ratio is the proportion of ground coffee to water, determining the strength of the brew (e.g., 1:11 means 1 part coffee to 11 parts water).
2. Why does the final volume differ from the water volume?
Coffee grounds absorb water during brewing (approximately 1.38 ml per gram), reducing the final liquid volume.
3. How do I convert coffee beans to grams?
The calculator assumes 1 coffee bean weighs approximately 0.15 g, a common average for roasted beans.
4. What brewing method should I choose?
Choose a ratio based on your brewing method: e.g., 1:11 for Aeropress, 1:12 for French Press, or 1:17 for Chemex.