What Is the Ratio of Coffee to Water for Chemex? Guideline for Chemex Coffee Ratio

The right Chemex ratio is one gram of coffee to 15 grams of water. To make one cup of coffee, use 20 grams of coffee beans (about three tablespoons) and 300 grams of water. You should stick pretty close to this recipe.

An 8-cup Chemex brewer suits a recipe of 45 grams of ground coffee to 720 grams of water. To scale up or down, use the ratio: 15-16 grams water to 1 gram of coffee.

For most drinks, the ideal Chemex coffee water ratio is between 1:16 and 1:18. For every 250 grams of water, use 15.6-13.8 grams of coffee. The best ratio for the Chemex is 1:16.66.

For two cups, use 34 grams of beans and 510 grams of water. The most a standard Chemex can brew at one time is 50 grams coffee to 750 grams water, making 3-4 cups.

Making coffee with a Chemex is simple with the right technique and equipment. Follow this guide to brew a perfect cup.

  1. Choose a high quality coffee bean and grind it to a medium coarse consistency using a burr grinder.
  2. Measure out 1 gram of coffee for every 15 grams of water.
  3. Bring a kettle of fresh water to boil and let it cool to around 200 degrees.
  4. Place a Chemex filter in the top portion of the Chemex and rinse with hot water.
  5. Pour the water over the grounds to extract the flavor.
  6. Allow the coffee to drain through on its own.
  7. Adjust the amount of coffee or water to produce a balanced cup. Start with a 1:15 ratio then experiment with 1:16 or 1:17 to suit your taste.
  8. Enjoy your perfectly brewed cup.

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