first of all the brew ratio is not same brewing ratio in SCAA from SCAA : The ratio of coffee grounds (mass) to water (volume): how much coffee is used for a given quantity of water. This may be expressed in units of either grams per litre this is mainly used for unpressurised brewing, eg drip, pourover or french press brewing. This can be simply called as coffee-to-water ratio it is recommended to be 55 g /L +/- 10%. The brew ratio ( or simply ratio of coffee grounds (mass) to water (volume)): how much coffee is used for a given quantity of water. This may be expressed in units of either grams per litre or ounces per US half gallon. These are related as follows: Strength = Brew ratio × Extraction which can be analyzed as the following identity: dissolved solids/water = grounds/water × dissolved solids/grounds So Brew ratio = Strength / Extraction or ...