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Coffee to Water Ratio Calculator

Brewing Recipe:

function calculateByWater() { var water = parseFloat(document.getElementById('waterInput').value); var ratio = parseFloat(document.getElementById('ratioInput').value); var resultDiv = document.getElementById('coffeeResult'); var output = document.getElementById('recipeOutput'); if (isNaN(water) || isNaN(ratio) || ratio <= 0) { alert('Please enter valid numbers for water and ratio.'); return; } var coffeeNeeded = (water / ratio).toFixed(1); resultDiv.style.display = 'block'; output.innerHTML = 'To brew with ' + water + 'ml of water at a 1:' + ratio + ' ratio, you need ' + coffeeNeeded + ' grams of ground coffee.'; document.getElementById('coffeeInput').value = coffeeNeeded; } function calculateByCoffee() { var coffee = parseFloat(document.getElementById('coffeeInput').value); var ratio = parseFloat(document.getElementById('ratioInput').value); var resultDiv = document.getElementById('coffeeResult'); var output = document.getElementById('recipeOutput'); if (isNaN(coffee) || isNaN(ratio) || ratio <= 0) { alert('Please enter valid numbers for coffee and ratio.'); return; } var waterNeeded = (coffee * ratio).toFixed(0); resultDiv.style.display = 'block'; output.innerHTML = 'Using ' + coffee + ' grams of coffee at a 1:' + ratio + ' ratio, you should use ' + waterNeeded + 'ml of water.'; document.getElementById('waterInput').value = waterNeeded; }

Understanding the Coffee to Water Ratio

The secret to a perfect cup of coffee isn't just the bean quality or the expensive equipment; it's the coffee-to-water ratio. This mathematical relationship determines the strength and extraction level of your brew. Using a coffee ratio calculator ensures consistency every time you brew, whether you are making a single cup or a full carafe.

Common Coffee Ratios and Their Taste Profiles

Depending on your brewing method (Pour Over, French Press, Aeropress, or Drip), you may want to adjust your ratio:

  • 1:15 Ratio (Strong): This ratio produces a bold, concentrated cup. It is ideal for French Press or those who add a lot of milk.
  • 1:16 to 1:17 Ratio (The Golden Ratio): Widely considered the standard for specialty coffee. It balances clarity of flavor with a satisfying body. Perfect for Hario V60 or Chemex.
  • 1:18 Ratio (Light/Tea-like): Provides a thinner body but highlights the delicate acidic notes and floral aromas of light roast coffees.

How to Use the Coffee Ratio Calculator

  1. Select your target water: If you have a specific mug size (e.g., 350ml), enter that in the water field.
  2. Choose your ratio: Use 16 as a starting point if you aren't sure.
  3. Measure by weight: For the best results, use a digital kitchen scale. Measuring coffee by spoons is inaccurate because different beans have different densities.

Practical Example

If you want to brew a standard 12oz cup (approx 355ml) using the Golden Ratio of 1:16:

  • Water: 355ml
  • Calculation: 355 / 16 = 22.18
  • Result: Use approximately 22 grams of medium-ground coffee.

Pro Tips for Better Brewing

While the ratio is the foundation, remember that water temperature (ideally 195°F to 205°F) and grind size also play massive roles. If your coffee tastes too bitter, try a coarser grind or a slightly higher ratio (1:17). If it tastes sour or weak, try a finer grind or a lower ratio (1:15).

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