Free · Tea and coffee calculators ☕

Coffee Dose & Input-Water Ratio Batch Planner

Scale coffee dose and input water across one to ten servings, retaining selectable ratio presets and clearly separating input water from a fixed-factor beverage estimate.

  • Formula & worked example
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Calculator inputs

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How to use this calculator

  1. Enter the known values in the units shown. Results update as you type.
  2. Where results are editable, change one to solve backwards. Lock a value to hold it fixed.
  3. Use the worked example to check the method. Reset restores the starting fields.

Private by default

Inputs and results stay in this browser tab. Bookify does not upload or store the values you enter.

Formula and method

At an input ratio of 11 mL water per gram, 15 g of coffee uses 165 mL of water. The retained fixed-factor model estimates 144.4245 mL of beverage.

Input water = coffee mass × water-to-coffee ratio; batch totals = per-serving quantities × servings; modeled beverage volume = input water × 0.8753

Worked example

Enter these known values and leave the other values blank.

Coffee dose per serving
15 g
Input water per serving
165 ml
Beverage estimate at 87.53% of input water
144.42 ml

Assumptions and limitations

  • Ratios here refer to input water in mL per gram of coffee. Espresso output-weight ratios are a different measurement.
  • The captured espresso preset uses 3.6 mL/g, despite its original 1:2 label. The option now states its actual input ratio. Other preset names identify the captured suggestions, not universal recipes.
  • The beverage estimate always uses 87.53% of input water. This fixed retained model does not measure extraction, absorption, evaporation or equipment retention and can differ substantially from a real brew.
  • Water mass selectors assume 1 g per mL. Serving count means portions, not a standard measuring-cup size. Custom input ratios must be positive.
  • Cold-brew and 3:50 presets retain the rounded inputs 4.444 and 16.6666 mL/g. For a different recipe, use the custom input ratio.

Common questions

Does the output predict espresso shot yield?

No. It applies the fixed beverage-volume factor to input water. Measure actual shot yield separately; an input-water ratio is not a dose-to-beverage-mass ratio.

References

Bookify validates positive custom ratios and batch quantities, and uses exact US customary cup and fluid-ounce conversions for the retained water-density model.

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