Coffee Brew Ratio CalculatorFree online other calculator — instant results, no sign-up
Find brew water mass from coffee dose and water-to-coffee ratio.
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About the Coffee Brew Ratio Calculator
The Coffee Brew Ratio Calculator finds the mass of brew water needed for a coffee dose and a chosen water-to-coffee ratio. Enter your ground coffee mass in grams and the grams of water to use per gram of coffee. With the default dose of 20 g and ratio of 16, the calculator returns 320 g water.
- Coffee dose (g)
- The mass of dry ground coffee you plan to brew, measured in grams, with a default of 20 g.
- Water per gram of coffee
- The mass of brew water in grams for each gram of dry coffee, expressed in g/g, with a default of 16.
Formula and method
W = D × R; with the default inputs, W = 20 g × 16 = 320 g water.
- WTotal brew water mass, in grams.
- DDry ground coffee dose, in grams.
- RWater-to-coffee mass ratio, in grams of water per gram of coffee.
Multiply the coffee dose by the water required per gram of coffee. The units of coffee mass cancel, leaving the required water mass in grams. The default calculation multiplies 20 by 16 to produce 320 g water.
Worked example
These are the calculator's starting values and the results it actually produces for them.
Inputs
- Coffee dose20 g
- Water per gram of coffee16
Results
- Result320 g water
How to use the Coffee Brew Ratio Calculator
- 1Weigh your dry ground coffee in grams.
- 2Enter that mass in Coffee dose (g); for the worked example, use 20.
- 3Enter your chosen Water per gram of coffee; for the worked example, use 16.
- 4Read the calculated water mass: the default inputs give 320 g water.
- 5Weigh out the calculated water amount for brewing, excluding any water used only to rinse the filter or preheat equipment.
Reading your result
The result row reports the total brew water mass in grams. With 20 g of coffee and 16 g of water per gram of coffee, 320 g water means you should use that total water mass for the brew. It is not the expected mass of coffee in the cup.
Limitations
This calculator assumes a mass-based ratio and positive coffee-dose and ratio inputs. It does not account for water retained by the grounds, evaporation, or equipment losses, so the finished beverage mass will differ from the water added. It also does not predict extraction or taste, which depend on factors such as grind size, water temperature, brew time, and brewing method.
Common questions
Does entering 16 mean a coffee-to-water ratio of 1:16?+
Yes. Entering 16 means 16 g of water for each gram of coffee, commonly written as a coffee-to-water ratio of 1:16. For 20 g of coffee, that gives 320 g water.
Is the 320 g result the amount of brewed coffee I will get?+
No. It is the water mass used to brew. Some water stays in the grounds or is lost during brewing, so the collected beverage will generally weigh less.
Does bloom water count toward the calculated total?+
Yes. If your recipe includes a bloom, count that water toward the total brew water mass. With the default inputs, the bloom and all later pours together should total 320 g.
Will a higher water-per-gram setting make my coffee stronger?+
At the same coffee dose, a higher setting uses more water and generally produces a less concentrated drink. A lower setting uses less water and generally produces a more concentrated drink, although extraction and taste also depend on your brewing technique.
Does the calculator save my information?+
Calculations run in your browser. While signed in, inputs and results are automatically recorded in account history; saving a result creates a separate saved record.
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Results are estimates for informational purposes and are not financial, medical or legal advice.