How much ground coffee do I need for 12 ounces of water?

The quest for the 'perfect' ratio is often reduced to a simple math problem, but it is fundamentally a matter of extraction efficiency. The Specialty Coffee Association (SCA) 'Golden Cup' standard targets a brew strength of 1.15% to 1.35% Total Dissolved Solids (TDS) and an extraction yield of 18% to 22%. Achieving this requires a ratio of roughly 55 grams of coffee per liter of water, which translates to the 1:16 to 1:18 range. When you brew 12 ounces of water, using 20–23 grams of coffee provides the necessary 'solvent' capacity to pull desirable sugars and acids from the grounds without over-extracting bitter, astringent compounds. A common misconception is that a 'cup' of coffee is 8 ounces; in brewing, it is traditionally 6 ounces, leading to widespread confusion in home measurements. From the producer's perspective, this ratio is vital because it honors the labor invested in the farm. When a consumer uses too little coffee, they dilute the nuanced terroir—the specific floral, fruity, or nutty notes the farmer worked to cultivate—into a thin, watery beverage. Conversely, using too much coffee can mask the quality of the bean with excessive intensity. By weighing your dose, you ensure that the coffee's inherent character is neither lost to dilution nor buried by over-concentration, respecting the agricultural product at the heart of your cup.