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Perfect Coffee to Water Ratio Calculator

Achieving the perfect brew is all about precision. Use this calculator to determine exactly how many grams of coffee beans you need based on your preferred brewing method and water volume.

Drip Coffee (1:17 – Mild) The Golden Ratio (1:16 – Balanced) French Press (1:15 – Strong) Aeropress (1:12 – Concentrated) Espresso (1:2 – Traditional) Cold Brew (1:10 – Concentrate)

Brewing Requirements:

0 Grams of Coffee

Approximately 0 Level Tablespoons

Formula:
function calculateCoffee() { var water = parseFloat(document.getElementById('waterAmount').value); var ratio = parseFloat(document.getElementById('customRatio').value); var resultDiv = document.getElementById('coffeeResult'); if (isNaN(water) || water <= 0) { alert('Please enter a valid amount of water.'); return; } if (isNaN(ratio) || ratio <= 0) { alert('Please enter a valid ratio.'); return; } var coffeeGrams = water / ratio; var tablespoons = coffeeGrams / 5; // Standard approximation: 1 tbsp ground coffee ≈ 5g document.getElementById('gramsRequired').innerText = coffeeGrams.toFixed(1); document.getElementById('tablespoonsRequired').innerText = tablespoons.toFixed(1); document.getElementById('calcFormula').innerText = water + "ml ÷ " + ratio + " ratio = " + coffeeGrams.toFixed(1) + "g coffee"; resultDiv.style.display = 'block'; }

Understanding the Coffee to Water Ratio

The secret to a café-quality cup of coffee at home isn't just the beans; it's the chemistry of the extraction. The Coffee to Water Ratio determines the strength and flavor profile of your brew. Even the most expensive Gesha beans will taste sour or bitter if the ratio is off.

The "Golden Ratio" Explained

The Specialty Coffee Association (SCA) recommends a "Golden Ratio" of 1:18. This means for every 1 gram of coffee, you use 18 grams of water. However, many enthusiasts prefer a 1:15 or 1:16 ratio for a slightly bolder, more full-bodied cup.

  • 1:12 (Strong): Ideal for Aeropress or those who add lots of milk.
  • 1:15 (Balanced/Full): Great for French Press and immersion brewing.
  • 1:17 (Smooth): The standard for Pour-over (Hario V60, Chemex) and Drip machines.
  • 1:2 (Concentrated): The standard for Espresso extraction.

Example Calculation

If you want to brew a standard 12oz mug (approx. 350ml) using a 1:16 ratio:

350ml ÷ 16 = 21.8 grams of coffee beans.

Pro Tips for Better Results

  1. Use a Scale: Measuring by volume (scoops) is inconsistent because bean density varies by roast level. Dark roasts are less dense than light roasts.
  2. Water Temperature: Aim for 195°F to 205°F (90°C to 96°C) for optimal extraction.
  3. Grind Size: Match your grind to your ratio and method. Coarse for French Press, Medium for Drip, Fine for Espresso.
  4. Water Quality: Since coffee is 98% water, use filtered water for the cleanest taste.

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