Chemex Brew Guide

Use a brew ratio of one part ground coffee to 16 or 17 parts water to start. Using this ratio, an 8-cup Chemex brewer is ideally suited to a recipe of 45 grams of ground coffee to 720 grams of brew water:

  1. Place the Chemex brewer on a scale.
  2. Place Chemex filter in place with the three-sided portion of the filter placed over the pouring spout.
  3. Rinse filter with hot water, discard water.
  4. Place 45g of medium-to-coarse ground coffee (~6 scoops) in bottom of filter and tare the scale.
  5. Begin to pour a small amount of water onto the coffee bed, about two to three times the weight of the ground coffee (90-135g), or just enough to fully cover and saturate the coffee evenly. Stir to ensure the entire bed is evenly saturated. Wait 30-45 seconds to allow the ground coffee to release CO2.
  6. Your second pour should provide half of the total brew water (360g) in 20-30 seconds. Make sure all of the grounds are saturated and agitated. Continue to add water in ~100g increments as coffee passes through the filter.
    PRO TIP: Make sure all coffee is off the edges of the filter. Pour in a controlled spiral motion and then slowly add water to the center of the bed to induce agitation of the coffee bed below.
  7. Wait for the coffee to finish dripping, remove filter, swirl, pour, enjoy!

The Chemex should brew from start to finish in about 4 minutes and 30 seconds. If it takes much longer than that, coarsen your grind size; if it brews much faster than that, make the grind size smaller. Some coffees may extract better with more water (a lower brew ratio) or with less (a higher brew ratio), so play with these parameters to suit your personal tastes.