Free · Tea and coffee calculators ☕

Coffee Dose and Input Water Ratios

Scale input water and coffee dose across the captured brew-method and strength presets.

  • Formula & worked example
  • Private in your browser
  • No signup
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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

Twenty grams of coffee with the default 18 mL/g input-water ratio uses 360 mL water.

Input water = coffee mass × selected mL-per-gram ratio

Worked example

Enter these known values and leave the other values blank.

Amount of coffee
20 g
which means 1 part coffee to
18 parts water
Amount of water
360 mL

Assumptions and limitations

  • The ratios describe input water, not finished beverage yield or caffeine. Presets are captured recipe suggestions. Water-mass options assume 1 g per mL; actual extraction and retained water depend on the equipment.
  • The captured US cup conversion is rounded to 236.59 mL. Yield and ratio presets are recipe estimates rather than precise ingredient measurements.

Common questions

What does this estimate assume?

The ratios describe input water, not finished beverage yield or caffeine. Presets are captured recipe suggestions. Water-mass options assume 1 g per mL; actual extraction and retained water depend on the equipment.

How should I enter a different quantity?

Choose the displayed measurement units before entering a value. Clear the unknown field, enter compatible known values, and use the preserved inverse branches where available. One-way estimates and rounded package outputs keep their original direction.

References

The calculation equations, inverse formulas, units, and input rules were imported from this source. Bookify provides the interface and equation solver.

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