What this calculator does
Coffee brew ratio works out grounds and water for a chosen strength. Enter your own figures above and the answer updates as you type: nothing is fixed in the code, so the result reflects exactly the numbers you supply.
The formula this calculator evaluates is printed under the tool and explained below, so you can check the working by hand or reuse it in a spreadsheet.
The formula
FormulaCoffee (g) = water (g) / ratio; 1 ml of water ≈ 1 g
The inputs explained
| Field | What to enter |
|---|---|
| Water (ml) | A number, measured in ml. Starts at 500. |
| Ratio (1 : n) | A number. Starts at 16. |
| Cups it makes | A number. Starts at 2. |
Worked examples
Every figure in the tables below is produced by this page’s own calculator at build time, so the numbers and the tool always agree. Select any row to load that scenario.
How the answer changes with water
Every other input is held at the calculator’s starting values while water varies. Select any row to load that scenario into the calculator.