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Coffee to Water Ratio Calculator

Calculate the perfect amount of grounds for your brew

Milliliters (ml) Ounces (oz) Cups (8oz)
1:15 – Strong & Bold 1:16 – Slightly Strong 1:17 – Balanced (SCA Standard) 1:18 – Light & Mild 1:8 – Cold Brew Concentrate Custom Ratio

Your Brewing Recipe

Understanding the Coffee to Water Ratio

Achieving the perfect cup of coffee is a science that relies heavily on the ratio of coffee grounds to water. This ratio determines the extraction levels and the overall strength of your brew. Whether you are using a Pour-over, French Press, or AeroPress, precision is key.

Popular Ratios Explained

  • 1:15 Ratio: Results in a more concentrated, punchy flavor. Great for those who enjoy a full-bodied cup or add milk.
  • 1:17 Ratio: Often cited by the Specialty Coffee Association (SCA) as the "Golden Ratio," it offers the most balanced extraction for manual brewing.
  • 1:18 Ratio: Produces a lighter, more delicate cup that highlights floral and citrus notes in lighter roasts.

How to Use This Calculator

Follow these simple steps to ensure your morning brew is consistent every single time:

  1. Measure your water: Input the total volume of water you intend to pour into your brewer.
  2. Choose your strength: Select a preset ratio or enter a custom one based on your personal preference.
  3. Weigh your coffee: Use a digital kitchen scale to weigh out the exact grams of coffee indicated by the calculator.
  4. Grind and Brew: Grind your beans fresh and enjoy a perfectly extracted cup!

Calculation Example

If you want to brew a standard 12oz (355ml) mug of coffee using the balanced 1:17 ratio:

355ml / 17 = 20.9 grams of coffee grounds.

document.getElementById('brewRatio').onchange = function() { var customContainer = document.getElementById('customRatioContainer'); if (this.value === 'custom') { customContainer.style.display = 'block'; } else { customContainer.style.display = 'none'; } }; function calculateCoffeeRequirements() { var waterVolume = parseFloat(document.getElementById('waterVolume').value); var waterUnit = document.getElementById('waterUnit').value; var brewRatio = document.getElementById('brewRatio').value; var customRatio = parseFloat(document.getElementById('customRatioValue').value); if (isNaN(waterVolume) || waterVolume <= 0) { alert('Please enter a valid water amount'); return; } var waterInMl = waterVolume; if (waterUnit === 'oz') { waterInMl = waterVolume * 29.5735; } else if (waterUnit === 'cups') { waterInMl = waterVolume * 236.588; } var ratioValue = (brewRatio === 'custom') ? customRatio : parseFloat(brewRatio); if (isNaN(ratioValue) || ratioValue <= 0) { alert('Please enter a valid ratio'); return; } var coffeeGrams = waterInMl / ratioValue; var resultDiv = document.getElementById('coffeeResult'); var output = document.getElementById('resultOutput'); var details = document.getElementById('recipeDetails'); resultDiv.style.display = 'block'; output.innerHTML = coffeeGrams.toFixed(1) + ' grams of Coffee'; details.innerHTML = 'For ' + waterInMl.toFixed(0) + 'ml of water at a 1:' + ratioValue + ' ratio.' + '(Equivalent to approx. ' + (coffeeGrams / 5).toFixed(1) + ' level teaspoons or ' + (coffeeGrams / 7).toFixed(1) + ' standard coffee scoops)'; resultDiv.scrollIntoView({ behavior: 'smooth', block: 'nearest' }); }

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