Grams or ounces, any batch
Glaze batch calculator
Each base material's weight is its share of the base times the batch size, and additions such as colourants and opacifiers are percent on top of the 100. For a 1,000 g batch of Digitalfire's G2926B cone 6 clear with 10% opacifier, you weigh 166.2 g of nepheline syenite and 100 g of opacifier.
Recipe card
G2926B white
| Material | % | Weigh out | Also |
|---|---|---|---|
| Nepheline Syenite | 16.62 | 166.2 g | 5.86 oz |
| Ferro Frit 3134 | 23.07 | 230.7 g | 8.14 oz |
| EPK kaolin | 17.8 | 178 g | 6.28 oz |
| Wollastonite | 6.27 | 62.67 g | 2.21 oz |
| Silica 325 mesh | 34.15 | 341.5 g | 12 oz |
| Talc | 2.09 | 20.89 g | 0.74 oz |
| Zircon opacifier addition | +10 | 100 g | 3.53 oz |
| Total dry | 110 | 1,100 g | 2.43 lb |
Your base adds up to 110.1, so the % column shows it scaled to 100. Additions are percent on top of the 100 base. Weigh dry, then add water: see the SG helper below.
SG and water
SG 1.48
Add 94.6 g (94.6 mL) of water to bring 2,100 g from 1.48 to 1.45.
To mix this recipe card's 1,100 g of dry glaze, start with 990 to 1,100 g of water, then measure and thin.
Water to add = (slurry g ÷ SG now) × (SG now − target) ÷ (target − 1). 1 g of water is 1 mL.
How to batch a glaze recipe
Type the base recipe as it is printed, even if it doesn't add up to 100: the calculator scales it. Put colourants, opacifiers and other extras under additions, as percent of the base. Pick the batch size, and whether that size is the base alone or everything you will weigh.
- Rescale to 100 rewrites the base so it totals exactly 100.00, which makes the recipe easier to compare and share.
- Water: Digitalfire says about equal weights of water and dry glaze give an SG of about 1.45. Start with a little less, mix, measure, then thin with the helper; you can add water but not take it out.
- Typical targets are starting points: potters mixing their own dipping glazes generally do best around 1.45, gelled dipping glazes around 1.43–1.45, and dipping-glaze instructions range from 1.4 for a five-second dip to 1.5 for one second.
Sources
- Example recipe, the 10% opacifier for a white and the 90 water to 100 powder starting point: Digitalfire, G2926B Cone 6 Whiteware/Porcelain transparent glaze (Tony Hansen), checked 2 November 2026.
- SG as weight ÷ volume, and the typical SG ranges: Digitalfire, Specific gravity. About 2,500 g of dry glaze in 2,500 g of water gives about 1.45: Digitalfire, Glaze Mixing. The water formula follows from that definition, with water at 1 g per mL.
- Silica dust: HSE, Silicosis: causes and risk controls; HSE, COSHH essentials in ceramics: Silica, CR1 Glaze and colour preparation (2019).
- 1 oz = 28.3495 g and 1 lb = 453.592 g: NIST Guide to the SI, Appendix B.8.
Questions
How do I convert a glaze recipe to grams?
Divide each base amount by the base total and multiply by the batch size. Additions are their percent of the batch size: 10% in a 1,000 g batch is 100 g on top.
Are additions part of the 100?
No. In a percentage recipe the base adds up to 100 and colourants or opacifiers are added on top, so 100 base plus 10 opacifier weighs 110 in all.
How much water do I add to glaze?
Start with a little under the dry weight in water, mix, then measure the SG and thin to your target. To bring 2,100 g of slurry from 1.48 to 1.45, add about 95 g of water.