Chemex Ratio: Coffee Beans to Water

Making pourover coffee and need the ratio of beans to water? Here’s the Chemex ratio: this simple formula makes for a perfect cup of coffee every time.

Chemex ratio

Wondering how to make coffee in a Chemex coffee maker? All you need is that Chemex ratio, which makes a perfect cup of coffee every time. Here is is:

Chemex ratio: 
1 gram coffee to 15 grams water

This Chemex ratio doesn’t meant much until you understand how many grams of coffee make 1 cup of coffee! Here are a few more things to keep in mind:

  • 1 cup of Chemex coffee: For 1 cup coffee, use 20 grams of coffee beans (about 3 tablespoons) and 300 grams water. (20 x 15 = 300)
  • 2 cups of Chemex coffee: For 2 cups coffee, use 34 grams coffee beans and 510 grams water. (34 x 15 = 510)
  • 3 to 4 cups of Chemex coffee (max): The maximum grams of coffee you can use in a standard 6-cup Chemex is 50 grams, which makes about 3 to 4 cups, depending on how large your cups are. Use 50 grams coffee and 750 grams water. (50 x 15 = 750)

Now, the 15 grams of water can actually 15 to 16 grams, depending on your taste in coffee. So you can feel free to flex up in water a bit as you see fit. Alex and I have found that our perfect pot is Chemex coffee with 34 grams coffee and 520 grams water — which you’ll see in the recipe below.

Note: You can use a Chemex to make our Chemex Iced Coffee or Pumpkin Spice Iced Coffee, too!

Chemex ratio

Need a Chemex recipe?

The Chemex ratio table above is great if you’re a seasoned Chemex pro and you don’t need a recipe for how to use it. But what if you’re just starting out? Don’t worry: we’ve got a full recipe AND a video to show you how it’s done — scroll down! And for more detailed information, see How to use a Chemex Coffee Maker.

More about coffee

Outside of how to use a Chemex coffee maker, we’ve got a series on how to make coffee using all sorts of gadgets!

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How to use a Chemex

Chemex Ratio: Coffee Beans to Water


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  • Author: Sonja Overhiser
  • Prep Time: 10 minutes
  • Cook Time: 0 minutes
  • Total Time: 10 minutes
  • Yield: 2 cups 1x

Description

Making pourover coffee and need the ratio of beans to water? Here’s the Chemex ratio: this simple formula makes for a perfect cup of coffee every time.


Scale

Ingredients

  • 34 grams light or medium roast coffee beans*
  • 520 grams filtered water (the flavor is best with filtered water)

Instructions

  1. Heat a pot of filtered water to 200 to 205F. We use an electric kettle that shows us the exact temperature. You could also use a teapot on the stove — just heat to boiling, then let the water cool down for a few minutes.
  2. Use a food scale to weigh out 34 grams of coffee, then grind it to a medium coarse grind (about the size of kosher or sea salt). We use an electric burr grinder to get a consistent grind.
  3. When the water is heated, place the filter in your Chemex (see the video below for exact instructions). Pour in just a bit of water to wet the filter, then pour out the water into the sink. Place the ground coffee into the Chemex and shake it to level it out.
  4. Place the Chemex on the food scale and tare it so the scale reads 0. Slowly pour in 70 grams of water in a circular motion. Then stop and wait for 1 minute: this allows the coffee to bloom (you may have to tap your scale once so that it doesn’t time out!).
  5. Then slowly add the remaining 520 grams water in two batches, pouring very slowly in concentric circles, pouring right onto the coffee and not touching the coffee filter. Fill to about 1/2 inch from the top (it will likely be around 400 grams water), wait for the water level to go down a bit, and then fill the remaining water up to 520 grams.
  6. After a few minutes, all of the water will filter through the coffee grounds into the pot below. Remove the filter and discard it (we compost ours).  Enjoy!

Notes

*In our large Chemex, the most you can make at one time is 50 grams of coffee and 800 grams water, which makes about 3 to 4 cups of coffee. To scale up or down, just use our magic ratio: 15-16 grams water to 1 gram of coffee.

  • Category: Drink
  • Method: Pourover
  • Cuisine: American

Keywords: Chemex ratio, Chemex coffee, Pourover coffee

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About the Authors

Sonja Overhiser

Cookbook Author and writer

Sonja Overhiser is author of Pretty Simple Cooking, named one of the best healthy cookbooks of 2018. She’s host of the food podcast Small Bites and founder of the food blog A Couple Cooks. Featured from the TODAY Show to Bon Appetit, Sonja seeks to inspire adventurous eating to make the world a better place one bite at a time.

Alex Overhiser

Cookbook Author and photographer

Alex Overhiser is an acclaimed food photographer and author based in Indianapolis. He’s host of the food podcast Small Bites and founder of the recipe website A Couple Cooks. Featured from the TODAY Show to Bon Appetit, Alex is author of Pretty Simple Cooking, named one of the best vegetarian cookbooks by Epicurious.

4 Comments

  • Reply
    Mikaela
    October 31, 2019 at 5:21 pm

    Hello,
    When you say large Chemex are you referring to the 10 cup?

    • Reply
      Alex Overhiser
      November 1, 2019 at 5:09 pm

      Sorry, no — just a 6 cup Chemex

  • Reply
    Amanda
    November 26, 2019 at 11:21 am

    What is your favorite type of coffee to drink \ what do you suggest? We are on the lighter side of coffee generally –

    • Reply
      Alex Overhiser
      November 26, 2019 at 4:55 pm

      Hi! We have fallen in love with single origin roasts from artisan roasters. Here in Indy we support local roasters Tinker St and Blue Mind.

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