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Chemex Ratio and Brew Time Guide

Chemex usually tastes best with a clean cup profile and medium-coarse grind. Start at 1:16.7 and tune by taste.

Beanie Bot tip: start with a balanced ratio, then tweak one variable at a time so your tongue can track what changed.

Quick Chemex Recipe

Ratio 1:16.7Brew Time 4:00-5:00Bloom 40s

Example: 500 ml water and 30 g coffee. Bloom with about 60 ml water, then pour in controlled pulses.

Chemex Ratio Table

WaterCoffee (1:16.7)Coffee (1:15)
350 ml21 g23.3 g
500 ml30 g33.3 g
700 ml41.9 g46.7 g
1000 ml59.9 g66.7 g

If Your Chemex Tastes Off

Related: fix bitter coffee and fix sour coffee.