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Calcimator

Water Chemistry Calculator

Calculate gypsum and calcium chloride additions to hit target mineral levels for your brewing water profile.

Inputs

gallons
ppm
ppm
ppm
ppm

Results

Gypsum (CaSO4)

7.12 grams

Calcium Chloride (CaCl2)

4.12 grams

Resulting Calcium115 ppm
Sulfate-to-Chloride Ratio2
Water Volume26.5 liters
Calcium Deficit65
How to Use This Calculator
  1. Enter your water volume in gallons and set target calcium, sulfate, and chloride levels (ppm).
  2. Enter your source water calcium level so the calculator adjusts additions accordingly.
  3. Review Gypsum (g) and Calcium Chloride (g) additions needed.
  4. Check Resulting Calcium and Sulfate-to-Chloride Ratio, along with the water volume converted to liters, to confirm your target water profile.

How the result changes with Water Volume

Water VolumeGypsum (CaSO4)Calcium Chloride (CaCl2)
5.96 grams3.47 grams
1818.32 grams10.6 grams
3333.58 grams19.43 grams
4545.79 grams26.49 grams

What each input means

Water Volume
Total volume of brewing water to treat in gallons (mash + sparge combined).
Target Calcium
Target calcium level in ppm. 50-150 ppm is typical; needed for enzyme activity and yeast health.
Target Sulfate
Target sulfate level in ppm. Higher for hoppy beers (200-300), lower for malty styles (50-100).
Target Chloride
Target chloride level in ppm. Higher for malty fullness (100-150), lower for crisp hoppy beers (50-75).
Source Water Calcium
Calcium level of your source water in ppm. Check your local water report or use RO/distilled (0 ppm) for a clean slate.

How this is calculated

Worked example, using the default values

  1. Identify Input Parameters
    4 parameters
    Water Volume = 7, Target Calcium = 75, Target Sulfate = 150, Target Chloride = 75 = 5 input(s) provided
  2. Calculate Gypsum
    Gypsum
    7.12 = 7.12
  3. Calculate Calcium Chloride
    Calcium Chloride
    4.12 = 4.12
  4. Calculate Resulting Calcium
    Resulting Calcium
    115 = 115
  5. Calculate Sulfate-to-Chloride Ratio
    Sulfate-to-Chloride Ratio
    2 = 2

Engine last updated . Checked against 2 independently-derived tests — how we verify calculators.

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