Section · tools
Coffee brewing tools
Calculators, charts and converters for measured brewing. Each tool runs in your browser with plain JavaScript, stores nothing, and shows the formula and sourced inputs it uses.
Several guides also carry their own calculators: the coffee-to-water ratio guide, the pour-over ratio page and the espresso ratio page.
ToolPrintable coffee ratio chartCups to grams of coffee and water at 1:15–1:18 and 55 g/L, for 8 fl oz and 5 fl oz coffeemaker cups.ToolPour schedule generatorDose and ratio in, timed pour table out: Kasuya’s 4:6 method (Philocoffea and HARIO Europe timings) or bloom plus pulses on Kalita Wave guide intervals, with a brew timer.ToolExtraction yield calculatorEY% from TDS, dose and beverage weight, with the full-immersion formula from UC Davis research and the 18–22% reference box.ToolWater hardness converterppm / mg/L as CaCO₃, grains per gallon, °dH, °fH, °e and mmol/L, with the USGS hardness band and SCA brewing-water ranges.ToolTemperature converter + altitude boiling point°F ↔ °C for brewing targets, and where water boils at your elevation (NWS standard atmosphere + NIST Antoine equation) against the SCA 195–205 °F band.