Calculate brewing coffee from water and ratio, or plan beans for cups, days and purchase bags.
What does a worked calculation look like?
Brewing 500 g of water at a 1:16 ratio needs 500 ÷ 16 = 31.25 g of coffee.
Method and practical checks
Coffee = water mass ÷ ratio. This plans brew inputs, not finished drink yield; water retained by grounds is not estimated. Espresso uses a different convention, so do not substitute beverage yield for water here.
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How the Coffee Ratio & Supply Calculator works
Every calculation option
Brew ratio
Enter water mass and the recipe’s water-to-coffee ratio.
Coffee = water mass ÷ ratio. This plans brew inputs, not finished drink yield; water retained by grounds is not estimated. Espresso uses a different convention, so do not substitute beverage yield for water here.
Cups & bags
Use your measured dose, serving count and existing stock.
The entered dose is specific to your brew recipe. Whole bags round up only after subtracting usable stock.
Worked example
Brewing 500 g of water at a 1:16 ratio needs 500 ÷ 16 = 31.25 g of coffee.
Pre-filled values: Brew ratio
Input
Value
Water mass
500 g
Water per gram of coffee
16 g/g
Calculated result
Result
Value
Coffee required
31.25 g
Reading the result
The ratio is water to coffee by weight; weighing both gives more consistent results than scoops.
The supply mode multiplies your actual dose, cups per day and days, then rounds to whole bags after subtracting stock.
Espresso recipes use a different convention (coffee to drink yield), so do not enter them as a water ratio.
No. Enter your actual brewed volume rather than assuming all mugs are the same. At a 1:16 coffee-to-water ratio, 1 L of water uses 62.5 g of coffee. The ratio is editable and does not promise identical flavour across different beans and brewing methods.
Does the supply estimate include waste?
Only the consumption and allowance you enter are included. Dialling in a grinder, retained grounds and discarded brews can use extra coffee. Compare the calculated quantity with pack sizes and freshness needs before buying a large stock. Allow for those separately. Allow for those separately.
How does a 1:16 coffee ratio scale to a smaller brew?
A 1:16 coffee-to-water ratio uses one part coffee for sixteen parts water under the tool's stated working units. For a 500 ml water input, the example gives 31.25 g of coffee. Keep brew volume and ratio separate; changing mug size need not mean changing the chosen brewing strength.
Calculation/content reviewed 4 October 2026. Source: Babushka Market’s displayed formulas, units and labelled editable assumptions. How the estimates work