Coffee Brew Ratio Planner

Convert a coffee-to-contact-water ratio in either direction, estimate beverage mass balance, and divide contact water into timed pours.

Brew inputs

Method starting point

Calculate from

Ratio: 1 part coffee to

Coffee unit

Coffee amount

Water unit

Contact brew water

Retained water (mL per g coffee)

Optional bypass water

Pour rounding increment

Total timer duration (seconds)

Pour stagesPercentages must total exactly 100. Times must be nondecreasing and no later than total timer duration. Maximum 20 stages.

Model and scope: Presets are convenient mathematical starting points, not authoritative recipes or quality claims. The ratio is coffee mass : contact-water mass, using 1 mL water ≈ 1 g for planning. Expected beverage = contact water − (coffee grams × retained mL/g) + bypass water. Bypass is not included in the brew ratio or staged pours. Grind, temperature, agitation, pressure, extraction, dissolved coffee solids, evaporation, equipment retention, water composition, taste, and measurement error are not modeled. Stage percentages and timer examples are editable planning values, not brewing requirements.

Coffee Brew Ratio Planner

Brew inputs

Plan

Optional local timer