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Coffee to Water Ratio Calculator

How much coffee do I need? How much water do I need?
1:15 (Strong/French Press) 1:16 (Standard/Drip) 1:17 (Golden Ratio/Pour Over) 1:18 (Light/Delicate) 1:2 (Espresso) Custom Ratio

Your Brewing Recipe:

document.getElementById('brewRatio').onchange = function() { var customGroup = document.getElementById('customRatioGroup'); if (this.value === 'custom') { customGroup.style.display = 'block'; } else { customGroup.style.display = 'none'; } }; function updateLabels() { var mode = document.getElementById('calcMode').value; var label = document.getElementById('inputLabel'); if (mode === 'coffee') { label.innerText = 'Desired Water Amount (ml/grams):'; } else { label.innerText = 'Available Coffee Amount (grams):'; } } function calculateCoffee() { var mode = document.getElementById('calcMode').value; var inputVal = parseFloat(document.getElementById('inputValue').value); var ratioType = document.getElementById('brewRatio').value; var ratio; if (ratioType === 'custom') { ratio = parseFloat(document.getElementById('customRatio').value); } else { ratio = parseFloat(ratioType); } if (isNaN(inputVal) || isNaN(ratio) || inputVal <= 0 || ratio <= 0) { alert('Please enter valid numbers.'); return; } var resultDiv = document.getElementById('coffeeResult'); var recipeText = document.getElementById('recipeText'); var outputCoffee, outputWater; if (mode === 'coffee') { // Calculating coffee needed for a specific amount of water outputCoffee = (inputVal / ratio).toFixed(1); outputWater = inputVal; recipeText.innerHTML = 'To brew with ' + outputWater + 'ml of water, you need:' + '
' + outputCoffee + ' grams of coffee
' + 'This follows a 1:' + ratio + ' ratio.'; } else { // Calculating water needed for a specific amount of coffee outputWater = (inputVal * ratio).toFixed(0); outputCoffee = inputVal; recipeText.innerHTML = 'For ' + outputCoffee + 'g of coffee beans, you need:' + '
' + outputWater + ' ml (grams) of water
' + 'This follows a 1:' + ratio + ' ratio.'; } resultDiv.style.display = 'block'; }

Mastering the Coffee to Water Ratio

In the world of specialty coffee, consistency is king. The difference between a cup that is bitter, sour, or perfect often comes down to the math behind the brew. Using a coffee to water ratio calculator allows you to replicate your favorite morning brew every single day, regardless of whether you are making a single mug or a full carafe.

Why Does the Coffee Ratio Matter?

The "Golden Ratio" is a guideline established by the Specialty Coffee Association (SCA) to help achieve the ideal extraction. Coffee extraction is the process of dissolving the flavors from the coffee grounds into the water. If you use too much water, you over-extract the beans, leading to a bitter, hollow taste. If you use too little, you under-extract, resulting in a sour, salty, or weak cup.

Common Brewing Ratios

Brewing Method Typical Ratio Resulting Profile
Espresso 1:1 to 1:2.5 Intense, concentrated, syrupy.
French Press 1:15 Heavy body, bold flavor.
Drip / Pour Over 1:16 or 1:17 Balanced, clean, highlights origin notes.
Aeropress 1:13 to 1:16 Versatile, usually medium-strong.
Cold Brew 1:4 to 1:8 Concentrate meant for dilution.

How to Use This Calculator

To use the coffee to water ratio calculator, follow these simple steps:

  1. Choose your mode: Decide if you want to calculate how much coffee you need for your water flask, or how much water you need for the remaining beans in your bag.
  2. Enter your values: Input the weight of your water (in milliliters or grams) or your coffee (in grams). Since 1ml of water equals 1 gram, the units are interchangeable.
  3. Select your ratio: If you are unsure, 1:17 is the industry standard for a balanced cup of filter coffee.
  4. Brew: Use a digital scale for the best results to ensure your measurements are precise.

Pro Tip: Use a Scale

While "tablespoons" and "scoops" are common, they are notoriously inaccurate. Coffee bean density varies wildly depending on the roast level and origin. A dark roast is less dense and takes up more volume than a light roast. Measuring by weight (grams) ensures that your 1:17 ratio remains exactly the same every time you brew.

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