French Press Coffee Calculator

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Expert Reviewer: David Chen, Specialty Coffee Consultant & SCA Member

Master your morning brew with our professional French Press Coffee Calculator. Whether you are aiming for a bold 1:12 kick or a smooth 1:15 balance, this tool ensures the perfect coffee-to-water ratio for your specific carafe size.

French Press Coffee Calculator

Common ratios are 12 to 18
Calculated Result
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French Press Coffee Calculator Formula

Water (ml) = Coffee (g) × Ratio
Coffee (g) = Water (ml) ÷ Ratio

Formula Source: Specialty Coffee Association (SCA) | Blue Bottle Coffee Guides

Variables Explained

  • Coffee Grounds: The weight of dry coffee beans after grinding (measured in grams).
  • Water Volume: The total amount of hot water added to the French Press (1ml = 1g).
  • Brewing Ratio: The ratio of coffee to water (e.g., 1:15 means 1 gram of coffee for every 15 grams of water).

Related Calculators

What is a French Press Coffee Calculator?

A French Press Coffee Calculator is a specialized tool designed to help baristas and home enthusiasts determine the precise measurements needed for immersion brewing. Because the French Press uses a full-immersion method, the contact time and ratio are critical for preventing over-extraction or a weak, watery cup.

Using a calculator eliminates guesswork, ensuring that whether you are brewing a single 300ml mug or a large 1-liter carafe, the flavor profile remains consistent every single time.

How to Calculate French Press Ratio (Example)

  1. Decide on your target ratio (e.g., 1:15 for a standard balanced cup).
  2. Measure your available water (e.g., 450ml).
  3. Divide the water volume by the ratio: 450 ÷ 15 = 30.
  4. The result (30g) is the exact amount of coffee you should grind.

Frequently Asked Questions (FAQ)

What is the best ratio for French Press?

Most experts recommend a 1:15 ratio for a balanced cup, while 1:12 provides a much stronger, concentrated flavor suitable for adding milk.

Do I use grams or milliliters for water?

In coffee brewing, 1ml of water equals 1g, so they are used interchangeably on a scale.

Does grind size affect the calculation?

The calculation remains the same, but French Press always requires a coarse grind to prevent bitterness and sediment.

Why is my coffee too weak?

If the ratio is correct (e.g., 1:15), you may need to increase your steeping time to 4 minutes or use a slightly finer grind.

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