How the coffee ratio calculator works
Brew ratio is the single biggest lever on how strong your coffee tastes. This calculator applies the standard relationship between coffee and water by weight: water (g) = coffee (g) × ratio, and its inverse, coffee (g) = water (g) ÷ ratio. A ratio written as 1:16 means one gram of coffee for every sixteen grams of water. Enter the amount you know — your coffee dose or a target amount of water — pick your ratio, and the tool returns the matching amount along with the total brew weight and a strength read.
The golden ratio
Most drip and pour-over methods target 1:15 to 1:17 (coffee:water by weight). The Specialty Coffee Association's "golden cup" standard centers near 55 grams of coffee per liter of water, which is about 1:18 by weight; many home baristas prefer the slightly stronger 1:16. Because water is close to 1 gram per milliliter, 480 grams of water is roughly 480 mL. Espresso runs much tighter at about 1:2 (a 20 g dose pulls a ~40 g shot), and cold brew concentrate is strong, around 1:8.
Common ratios at a glance
- Espresso: ~1:2 (18–20 g in, 36–40 g out).
- Moka pot / strong brew: ~1:10 to 1:12.
- Pour-over / drip (balanced): 1:15 to 1:17 — the everyday sweet spot.
- French press: ~1:15 (30 g coffee to 450 g water).
- Cold brew concentrate: ~1:8, steeped 12–24 hours and later diluted to taste.
Ratio versus extraction
Ratio sets strength (how much coffee is dissolved into the cup). Grind size, water temperature, and contact time set extraction (which flavors come out). Fix ratio first with the scale, then dial in the rest:
- Under-extracted (sour, thin): grind finer, extend contact time, or raise temperature.
- Over-extracted (bitter, harsh): grind coarser, shorten time, or lower temperature.
- Water temperature: 90–96 °C (195–205 °F) for most methods; espresso 90–94 °C.