Coffee Brewing Ratio Calculator
Calculate the perfect amount of coffee grounds or water for your preferred brew strength.
Amount of Water (ml)
Amount of Coffee (g)
The Resulting Ratio
Brewing Recipe:
The Science of the Golden Ratio
In the world of specialty coffee, the "Brew Ratio" is the relationship between the weight of dry coffee grounds and the weight of the water used to brew it. It is the most critical variable you can control to ensure your coffee isn't too weak (under-extracted) or too bitter (over-extracted).
Popular Brewing Ratios by Method
| Brewing Method | Recommended Ratio | Taste Profile |
|---|---|---|
| Espresso | 1:2 | Intense, concentrated |
| Aeropress | 1:12 to 1:15 | Rich and full-bodied |
| French Press | 1:15 | Bold and heavy texture |
| Pour Over (V60/Chemex) | 1:16 or 1:17 | Clean, tea-like, vibrant |
| Cold Brew | 1:8 (Concentrate) | Low acidity, high caffeine |
How to Use This Calculator
1. Find Water: If you have a specific amount of coffee left in your bag, enter the grams and your desired ratio. We'll tell you how much water to heat up.
2. Find Coffee: If you have a specific mug size (e.g., 300ml), enter the water amount and ratio. We'll tell you exactly how much coffee to grind.
3. Find Ratio: If you just brewed a pot and want to know why it tasted so good (or bad), enter both the coffee and water amounts used to discover your ratio.
Quick Pro-Tips for Better Coffee
- Use a Scale: Volumetric measurements (spoons and cups) are inaccurate because coffee density varies by roast. Always weigh in grams.
- Water Temperature: Aim for 195°F to 205°F (90°C to 96°C) for optimal extraction.
- Grind Size: Match your grind to your method. Fine for Espresso, Medium for Pour Over, and Coarse for French Press.
Coffee: " + coffee + "g
";
html += "Target Water: " + calculatedWater.toFixed(0) + "ml
";
html += "Ratio: 1:" + ratio + "
";
}
else if (mode === "coffee") {
if (!water || !ratio || water <= 0 || ratio <= 0) {
alert("Please enter valid water amount and ratio.");
return;
}
var calculatedCoffee = water / ratio;
html = "Target Coffee: " + calculatedCoffee.toFixed(1) + "g
";
html += "Water: " + water + "ml
";
html += "Ratio: 1:" + ratio + "
";
}
else if (mode === "ratio") {
if (!water || !coffee || water <= 0 || coffee <= 0) {
alert("Please enter valid water and coffee amounts.");
return;
}
var calculatedRatio = water / coffee;
html = "Coffee: " + coffee + "g
";
html += "Water: " + water + "ml
";
html += "Calculated Ratio: 1:" + calculatedRatio.toFixed(1) + "
";
}
output.innerHTML = html;
resultDiv.style.display = "block";
}
// Initialize display on load
updateInputs();