Coffee Ratio Calculator
Record or repeat a filter-coffee recipe from measured ingredients. A larger ratio means more water per unit of coffee in the starting recipe.
How the result changes
Only ground coffee changes; all other inputs stay at your current values. The line illustrates the formula across the shown range. This is not a forecast of real-world outcomes.
About this calculation
Coffee Ratio Calculator calculates water-to-coffee ratio from ground coffee, brewing water. Record or repeat a filter-coffee recipe from measured ingredients. The main answer uses g water / g coffee and follows the specific assumptions explained below.
Formula
Water-to-coffee ratio = brewing water mass ÷ dry coffee mass.
Worked example
With Ground coffee: 18 g, Brewing water: 300 g, water-to-coffee ratio is 16.666667 g water / g coffee.
Inputs and calculation
Weigh the dry grounds and the water before brewing. Divide water grams by coffee grams to express the recipe as one part coffee to the displayed number of parts water. The displayed relationship is Water-to-coffee ratio = brewing water mass ÷ dry coffee mass. Keep the fields' displayed units attached when reproducing this relationship by hand.
Worked numerical example
For example, enter ground coffee 18 g, brewing water 300 g. Those inputs produce water-to-coffee ratio of 16.6667 g water / g coffee. The same values also give coffee share of combined inputs 5.6604 %.
Holding the other example values fixed, change ground coffee from 18 to 19.8 g. The main output becomes 15.1515 g water / g coffee. This comparison isolates the effect of that one input.
How to read and use the result
A larger ratio means more water per unit of coffee in the starting recipe. It does not by itself predict final beverage strength or extraction quality. Record or repeat a filter-coffee recipe from measured ingredients.
Practical context
Eighteen grams of grounds with 300 grams of brewing water give about 16.7 parts water per part dry coffee. If only 250 grams of beverage reaches the cup, the starting ratio remains 16.7 because retained water in the grounds does not change the ingredients originally added. Compare recipes using the same direction of ratio: some write 1:16.7, while others write 16.7:1.
Assumptions and scope
The ratio uses input masses, not brewed beverage yield after water remains in the grounds. Roast, grind, temperature and technique stay unspecified. Replace the example defaults with measured inputs for your situation and account separately for factors outside these fields.
Checks and common mistakes
Do not interchange a water-to-coffee ratio with its inverse. Measuring water by volume is usually close for ordinary brewing, but a scale avoids confusion.
Common questions
What should I verify before using the Coffee Ratio Calculator result?
If the cup tastes weak, changing grind or extraction may matter as much as changing the starting ratio. For a pour-over recipe, the water field should be the water poured into the grounds, including water retained by them. Entering only the brewed liquid collected in the carafe would produce a lower ratio and misstate the starting recipe.
Inputs
- Ground coffee (g)
- Brewing water (g)