Last updated: May 2026
The perfect cup starts with the right ratio. Enter your brew method, coffee amount or water amount — get instant, precise measurements for every brew style.
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Quick Scale — Cups of Coffee
The ratio is everything. Coffee ratio is expressed as 1:[X] where X is the parts of water per part coffee. A 1:15 ratio means 1g coffee per 15g water. Lighter ratios (1:17–1:18) produce weaker, more delicate cups. Stronger ratios (1:12–1:13) produce concentrated, bold results.
Why weight, not volume? Coffee grounds are inconsistent in density — a tablespoon of light roast weighs less than a tablespoon of dark roast. Using grams eliminates this variable. If you do not have a scale, the tablespoon conversion above is a reasonable approximation.
Water temperature matters: Optimal extraction temperature is 195–205°F (90–96°C). Boiling water (212°F/100°C) can over-extract and create bitterness. Let your kettle sit for 30 seconds off boil. Cold brew is the exception — room temperature or refrigerator temperature, 12–24 hours.
⚠️ Ratios are starting points. Adjust to taste — grind size, roast level, water quality, and brewing technique all affect the final cup.