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Calcimator

Glaze Recipe Calculator

Calculate ingredient weights in grams from a total batch weight and percentage breakdown of silica, alumina, flux, and colorant.

Inputs

oz
%
%
%
%

Results

Silica Weight

300 g

≈ 3 sticks of butter

Alumina Weight150 g
Flux Weight450 g
Colorant Weight30 g
Filler / Remainder70 g
Total Allocated93%
How to Use This Calculator
  1. Enter the total batch weight in grams — use 100–500 g for test batches and 1000–5000 g for studio batches.
  2. Set the silica (SiO2) percentage, typically 20–40%, to control glass formation.
  3. Enter the alumina (Al2O3) percentage (10–20%) to add durability and prevent glaze running.
  4. Set the flux percentage (feldspar, whiting, etc.) — usually 30–60% to lower the melting point.
  5. Enter the colorant oxide percentage (cobalt, iron, copper, etc.) — typically 1–10%.
  6. Read the calculated gram weights for each ingredient and weigh them on a digital scale for mixing.

How the result changes with Total Batch Weight

Total Batch WeightSilica Weight
5,0091,502.7 g
17,5075,252.1 g
32,5049,751.2 g
45,00113,500.3 g

What each input means

Total Batch Weight
Total weight of the glaze batch in grams. A typical test batch is 100-500 g; a studio batch is 1000-5000 g.
Silica (SiO2)
Percentage of silica (glass former). Typical range is 20-40% depending on cone and glaze type.
Alumina (Al2O3)
Percentage of alumina (stiffener). Adds durability and prevents running. Typical range is 10-20%.
Flux
Percentage of flux material (feldspar, whiting, etc.). Lowers melting temperature. Typical range is 30-60%.
Colorant / Oxide
Percentage of colorant oxide (cobalt, iron, copper, etc.). Usually 1-10% depending on desired intensity.

How this is calculated

Worked example, using the default values

  1. Identify Input Parameters
    4 parameters
    Total Batch Weight = 1000, Silica (SiO2) = 30, Alumina (Al2O3) = 15, Flux = 45 = 5 input(s) provided
  2. Calculate Silica Weight
    Silica Weight
    300 = 300
  3. Calculate Alumina Weight
    Alumina Weight
    150 = 150
  4. Calculate Flux Weight
    Flux Weight
    450 = 450

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