Coffee Brew Ratio Calculator
Brew ratio compares dry coffee dose to water added. A 1:X convention makes the quantity easy to scale while keeping the ratio consistent.
How to use this calculator
- Enter dry coffee mass in grams and water added in millilitres.
- Check that all inputs use the same units, period and population scope.
- Change one assumption at a time when comparing scenarios.
Formula used by coffee brew ratio calculator calculator
Water-to-coffee ratio = water millilitres ÷ dry coffee grams; reported convention is 1:X.
- Water-to-coffee ratio = water millilitres ÷ dry coffee grams; reported convention is 1:X.
- This is input ratio, not final beverage yield; coffee retention, grind, brew method and water density affect the cup.
- The tool validates inputs and rounds displayed figures for readability; it does not validate assumptions against external records.
Worked examples
Worked example
18 g of coffee is brewed with 300 mL water.
300 ÷ 18 ≈ 16.67, so the ratio is 1:16.67.
The brew ratio is approximately 1:16.67.
Understanding the result
Brew ratio compares dry coffee dose to water added. A 1:X convention makes the quantity easy to scale while keeping the ratio consistent.
This is input ratio, not final beverage yield; coffee retention, grind, brew method and water density affect the cup.
Important notes
This is input ratio, not final beverage yield; coffee retention, grind, brew method and water density affect the cup.
Treat the result as an estimate from the entered assumptions. For commercial, statistical, engineering or health-related decisions, verify relevant specifications and professional guidance.
Frequently asked questions
Is 1:16.67 a universal best ratio?
No. Preferred ratios depend on brewing method, recipe and taste.
Does all added water enter the cup?
No. Some water is retained by the grounds and equipment.
How should I interpret this result?
This is input ratio, not final beverage yield; coffee retention, grind, brew method and water density affect the cup.
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This page provides a calculation tool plus explanatory information so you can understand what the result means and when the underlying method may not fit your situation.