The ideal coffee to water ratio ranges from 1:16 (one part coffee against 16 parts water) to 1:18 (one part coffee against 18 parts water). For instance,16 grams of coffee against 256 grams or ml of water to 288 grams or ml of water is an ideal combination that gives you a well rounded body and smooth taste. We have tried this coffee to water ratio for our medium dark roasts and has worked great for us.