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Coffee Ratio Calculator

Find the perfect coffee-to-water ratio for any brew method.

Last updated: June 13, 2026

Calculator

Results

Coffee Needed34.0g

~6.8 tablespoons

Water Needed474 mL

16.0 fl oz

Ratio1:14

Coffee to water

Caffeine (est.)190 mg

~95mg per cup

How to Use This Calculator

  1. 1Select your brew method.
  2. 2Enter the number of cups you want to make.
  3. 3Choose your preferred strength.
  4. 4View the exact coffee and water amounts needed.

Formula Explanation

Each brew method has an optimal coffee-to-water ratio. The calculator adjusts based on method and strength preference.

Coffee (g) = Grams per Cup × Number of Cups

Variables:

Grams per CupVaries by method: 15-20g for drip, 12-18g for French press, 55-65g for espresso
CupsNumber of cups desired

Worked Examples

2 cups of medium drip coffee

  1. 1. 17g per cup × 2 cups = 34g coffee
  2. 2. Water: 237mL × 2 = 474mL
Result: 34g coffee (6.8 tbsp) with 474mL water

Why Use This Calculator

  • Consistent, great-tasting coffee every time.
  • Covers all major brew methods with tested ratios.
  • Adjustable strength for personal preference.
  • Shows coffee in grams and tablespoons for flexibility.
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Tips & Best Practices

  • Use a kitchen scale for the most accurate coffee measurement.
  • Freshly ground beans make the biggest difference in flavor.
  • Water temperature should be 195-205°F for optimal extraction.

Common Mistakes to Avoid

Using boiling water directly on coffee.

Let water cool 30 seconds off the boil to reach the ideal 195-205°F range.

Using pre-ground coffee.

Grind beans just before brewing for the freshest flavor. Grind size matters: coarse for French press, medium for drip, fine for espresso.

Frequently Asked Questions

What is the golden ratio for coffee?
The Specialty Coffee Association recommends 1:15 to 1:18 (coffee to water by weight). For drip coffee, 17g per 8oz cup is a great starting point.
How much caffeine is in a cup of coffee?
An average 8oz cup of drip coffee contains about 95mg of caffeine. Espresso has about 63mg per shot (1oz). Cold brew concentrate can have 200mg+ per cup.
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Disclaimer: This calculator is provided for informational and educational purposes only. Results are estimates and should not be used as a substitute for professional advice. RediCalc.com makes no guarantees regarding the accuracy, completeness, or suitability of any calculations. Always consult a qualified professional before making financial, health, construction, or other important decisions.

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