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Coffee Brewing Ratio Calculator

Calculate the perfect balance of coffee and water for your brew

Enter the 'X' value (15-17 is standard)

Your Brewing Recipe:

function calculateWaterNeeded() { var coffee = parseFloat(document.getElementById('input_coffee').value); var ratio = parseFloat(document.getElementById('input_ratio').value); var resultBox = document.getElementById('coffee_result_box'); var display = document.getElementById('coffee_display_result'); if (isNaN(coffee) || isNaN(ratio) || coffee <= 0 || ratio <= 0) { alert("Please enter valid positive numbers for Coffee and Ratio."); return; } var water = coffee * ratio; display.innerHTML = "To use " + coffee + "g of coffee with a 1:" + ratio + " ratio, you need " + water.toFixed(1) + "ml of water."; resultBox.style.display = "block"; document.getElementById('input_water').value = water.toFixed(0); } function calculateCoffeeNeeded() { var water = parseFloat(document.getElementById('input_water').value); var ratio = parseFloat(document.getElementById('input_ratio').value); var resultBox = document.getElementById('coffee_result_box'); var display = document.getElementById('coffee_display_result'); if (isNaN(water) || isNaN(ratio) || water <= 0 || ratio <= 0) { alert("Please enter valid positive numbers for Water and Ratio."); return; } var coffee = water / ratio; display.innerHTML = "For " + water + "ml of water with a 1:" + ratio + " ratio, use " + coffee.toFixed(1) + "g of ground coffee."; resultBox.style.display = "block"; document.getElementById('input_coffee').value = coffee.toFixed(1); } function resetCoffeeCalc() { document.getElementById('input_coffee').value = "; document.getElementById('input_ratio').value = "; document.getElementById('input_water').value = "; document.getElementById('coffee_result_box').style.display = "none"; }

Mastering Your Coffee Brewing Ratio

Whether you are brewing a morning pour-over or a weekend French Press, the coffee-to-water ratio is the single most important variable in determining the strength and flavor profile of your cup. Even the most expensive specialty beans can taste bitter or sour if your measurements are off.

What is a Coffee Ratio?

The coffee ratio is a simple comparison of the weight of dry ground coffee to the weight of water used during the brew. It is usually expressed as 1:X, where '1' represents 1 gram of coffee and 'X' represents the grams (or milliliters) of water.

Popular Coffee Ratios at a Glance:

  • 1:12 (Strong): Ideal for Aeropress or bold Cold Brew concentrates.
  • 1:15 (Rich): A great starting point for French Press and full-bodied pour-overs.
  • 1:17 (Balanced): The Specialty Coffee Association (SCA) "Golden Cup" standard for drip coffee.
  • 1:18 (Light): Best for highlighting delicate floral notes in high-altitude light roasts.

How to Use the Coffee Calculator

Our calculator helps you stop guessing. Follow these steps for a perfect brew:

  1. Decide your strength: Choose a ratio (15 for strong, 17 for standard).
  2. Measure your coffee: If you have 20g of coffee left, enter "20" and click "Find Water" to see how much water to pour.
  3. Measure your mug: If you know your favorite mug holds 350ml, enter "350" and click "Find Coffee" to see exactly how much you need to grind.

Example Calculation

If you are using a standard 1:16 ratio and you want to make a large 500ml batch of coffee:

  • Math: 500ml ÷ 16 = 31.25g
  • Result: You should use 31.3 grams of coffee for 500ml of water.

Pro Tips for Better Brewing

To get the most out of your calculated ratio, remember these two critical factors:

  • Use a Scale: Volumetric measurements (scoops and cups) are inaccurate because dark roasts are less dense than light roasts. Always weigh in grams.
  • Water Temperature: Aim for 195°F to 205°F (90°C to 96°C). Water that is too hot causes bitterness, while water that is too cool results in a sour, under-extracted cup.
© Coffee Brewing Ratio Tool – Precision for Every Bean.

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