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Coffee to Water Ratio Calculator

Dial in your perfect cup of coffee with precision

1:15 (Stronger/Full Body) 1:16 (Balanced/Standard) 1:17 (Lighter/Tea-like) 1:12 (Cold Brew Concentrate) 1:2 (Espresso)

Custom Ratio:

I know how much COFFEE I have I know how much WATER I want
Recommended Amount
480.0 ml
of Total Water

The Golden Ratio: Why Coffee Math Matters

Achieving the perfect cup of coffee is a balance of chemistry and physics. The "Coffee to Water Ratio" is the relationship between the weight of dry coffee grounds and the weight (or volume) of water used for extraction. Even a small variation in this ratio can drastically change the flavor profile of your brew, leading to either sourness (under-extraction) or bitterness (over-extraction).

Standard Brewing Ratios

While personal preference varies, professional baristas generally follow these industry standards:

  • 1:15 Ratio: Creates a concentrated, rich, and full-bodied cup. Ideal for French Press or those who add milk.
  • 1:16 Ratio: The "sweet spot" for most specialty coffee enthusiasts, balancing clarity and body.
  • 1:17 Ratio: A lighter, more tea-like consistency that highlights delicate floral and fruity notes in pour-overs.
  • 1:2 Ratio: The standard for Espresso, where 18g of coffee yields roughly 36g of liquid.

How to Use the Calculator

  1. Select your Ratio: Choose from the common presets or enter your own custom value.
  2. Choose your Calculation Mode: Decide if you want to find out how much water you need for the beans you have, or how many beans you need to fill your carafe.
  3. Input your weight: Enter the amount in grams. Note that for water, 1ml equals 1 gram, making calculations seamless.
  4. Brew: Use the precise measurements to start your brewing process.

Coffee Brewing Pro-Tips

To get the most out of this calculator, remember these variables:

  • Use a Scale: Measuring by volume (spoons and cups) is inaccurate because bean density varies. Always measure by weight.
  • 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. Coarse for French Press, medium for Drip, and fine for Espresso.
function toggleMode() { var mode = document.getElementById('calc_mode').value; var label = document.getElementById('main_label'); var unitLabel = document.getElementById('unit_label'); if (mode === 'water') { label.innerHTML = "Coffee Grounds (Grams)"; unitLabel.innerHTML = "of Total Water (ml)"; } else { label.innerHTML = "Desired Water (ml)"; unitLabel.innerHTML = "of Coffee Grounds (grams)"; } calculateBrew(); } function calculateBrew() { var mode = document.getElementById('calc_mode').value; var inputValue = parseFloat(document.getElementById('primary_input').value); var ratio = parseFloat(document.getElementById('ratio_val').value); var outputElement = document.getElementById('final_output'); if (isNaN(inputValue) || inputValue <= 0) { outputElement.innerHTML = "—"; return; } if (isNaN(ratio) || ratio <= 0) { outputElement.innerHTML = "—"; return; } var result = 0; if (mode === 'water') { // Find water: Coffee * Ratio result = inputValue * ratio; outputElement.innerHTML = result.toFixed(1) + " ml"; } else { // Find coffee: Water / Ratio result = inputValue / ratio; outputElement.innerHTML = result.toFixed(1) + " g"; } } // Initial calculation on load calculateBrew();

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