Standard Chemex Ratio: 1:16.5
Chemex Coffee to Water Ratio Calculator
For Chemex, the ideal ratio is 1:16.5 (e.g. 30.3 grams coffee to 500 ml water). Chemex thick bonded filters trap oils and sediment, yielding exceptionally clean floral sweetness.
Interactive Ratio Adjuster
Grind Size
Medium-Coarse (Rough Sand)
Water Temp
205°F (96°C)
Brew Time
4:00 minutes
Required Coffee Grounds
Ground Coffee Needed
0.0 g
0.0 level scoops (approx. 0.0 tbsp)
Ounces (oz)
0.00 oz
Water (fl oz)
0.0 fl oz
Bloom Water
0 g
Recommended Brew Sequence
1
Weigh 0g of coffee. Grind to Medium-Coarse (Rough Sand).
2
Preheat water to 205°F (96°C). Rinse paper or mesh filter with hot water.
3
Pour 0g water for 45s bloom to release trapped CO2 gases.
4
Complete pour to 0ml. Target total brew finish: 4:00 minutes.
Standard Servings Quick Reference Chart
| Serving Size | Water (ml / g) | Water (fl oz) | Coffee Grounds (Grams) | Level Scoops (~10g) | Level Tablespoons (~5g) |
|---|
Frequently Asked Questions
Why is Chemex ratio slightly different from V60?
Chemex uses 20-30% thicker laboratory-grade paper filters that remove almost all cafestol oils and fine sediments. A 1:16.5 to 1:17 ratio prevents over-extraction and keeps the cup bright.
How much coffee for a 6-cup Chemex?
Chemex defines 1 cup as 5 fl oz (150 ml). A 6-cup Chemex holds 900 ml of water. At a 1:16.5 ratio, use 54.5 grams of medium-coarse ground coffee.