Food & drink · Coffee
Coffee brew ratio calculator.
Scale a coffee recipe from the grounds you have, the water you want, or the ratio you prefer.
Brew inputs
Brew recipe
Enter a recipe to see the scaled amounts.
How brew ratio works
This calculator uses water weight ÷ ground-coffee weight. A 30 g dose at 16:1 therefore uses 480 g of water. The ratio is a recipe scaling tool, not a promise about strength or taste; grind size, contact time, water and extraction also matter.
Water volume is shown as an approximation because this tool treats 1 g of water as about 1 mL. Use a scale for the most repeatable brew.
Formula sources
Checked
- Specialty Coffee Association: brewing ratio definitions describes water per mass of ground coffee and shows how ratios scale recipes.
This page is a local arithmetic aid. It does not connect to a coffee machine or evaluate extraction.
Scope
Use weights rather than volume when you need repeatability. The imperial fluid-ounce figure is an approximate water-volume conversion, not a measurement of the coffee grounds.