Coffee ratio calculator
Turn a number of cups, grams of coffee or millilitres of water into the right brew ratio.
Coffee ratio calculator
Paste one quantity per line — a number of cups, grams of coffee or millilitres of water — and this tool returns exactly how much coffee and water to use, based on the water-to-coffee ratio for your brewing method. It covers the five most common ratios: V60 and Chemex at 1:16, French press at 1:15, espresso at 1:2, moka pot at 1:10 and cold brew at 1:8, plus a custom ratio for any other method or personal preference.
Pick the method from the options above and the tool shows its ratio, recommended grind coarseness and extraction time alongside the calculated amounts. The strength setting nudges the ratio up for a milder cup or down for a stronger one, without you having to redo the math by hand. The "Quantity is" option controls how each input line is read — as a count of cups (multiplied by the cup size you set, default 240 ml), grams of coffee, or millilitres of water — so you can start from whichever number you already know.
Enter several lines to size a whole batch at once: one line per pot, per guest count, or per pitcher of cold brew. A line that isn't a plain positive number is left untouched and marked so you can fix it, everything else is calculated instantly as you type. The live tally under the output adds up the total coffee and water across every valid line.
Everything runs locally in your browser — nothing you type is uploaded anywhere. When you're happy with the numbers, copy the result, download it as a .txt file to keep by the kettle, or send it straight into another tool like the recipe scaler.