Base materials = 100%
Each base percentage is a share of the dry base weight. At a 1,000 g base, 40% feldspar is 400 g. If your base does not total 100, normalize it first so the percentages match the usual 100-part recipe form.
THE POTTERY STUDIO
Glaze recipe batch calculator
Convert a glaze recipe written in dry-weight percentages into gram (or kilogram) weights for any batch size. Colorants and opacifiers are added on top of the 100% base, the usual studio convention.
The prefilled numbers are an illustrative layout example only—not a tested or recommended glaze. Replace them with your own recipe. Scaling a clay body instead of a glaze? Use the clay batch recipe calculator.
YOUR BATCH SHEET
Total dry weight (g)
0 g
| Material | % | Grams |
|---|
The calculationbase material g = base weight × % ÷ 100
additive g = base weight × additive % ÷ 100
A weighing aid, not a recipe check. It does not judge whether a glaze fits your clay, melts at your cone, or is safe for food use. Fire test tiles on your own clay before mixing a large batch.
✓ Your recipe, no presets assumed✓ No signup✓ Calculated in your browser
WEIGH IT RIGHT
How the glaze batch is calculated
Studio glaze recipes are usually written as dry-weight percentages. The base materials add up to 100, and colorants or opacifiers are listed separately as extra percentages of that base weight.
Additives go on top
A 5% addition on a 1,000 g base is 50 g extra, so the full dry batch weighs 1,050 g. Choose “Whole batch incl. additives” if you want the final total to equal your target instead.
Dry weights, then water
All weights are for dry powdered materials. Add water separately. Check your scale’s readability before choosing 0.1 g or 1 g rounding.
Test first. Accurate weighing does not guarantee the result you expect. Materials vary by supplier and lot, and firing, application thickness and clay body all change the outcome. Mix a small test batch and fire test tiles on your own clay before scaling up.
Related method notes: How our clay calculations work. For clay-body recipes written in parts or percentages, use the clay batch recipe calculator.
Glaze batch FAQs
Why are colorants added on top of 100%?
By convention, the base glaze is written to total 100 and colorants, opacifiers and other additions are listed as extra percentages of that base dry weight. This lets you change a colorant without rewriting the base. A 2% addition on a 500 g base is 10 g.
What if my base recipe doesn’t add up to 100?
The calculator requires the base to total 100% before it weighs a batch, so the additive percentages keep a clear meaning. Click “Normalize base to 100%” to rewrite only the base percentages with the same proportions. Additive percentages are left unchanged—they stay “per 100 of base.”
Should the target weight include the additives?
Either works. “Base recipe only” means the base weighs exactly your target and additives come on top. “Whole batch incl. additives” scales everything so the complete dry batch equals your target.
Why don’t my rounded weights add up exactly?
Each material is rounded separately, so the rounded total can differ slightly from the exact total. The calculator shows a note when this happens. For very small additions, use a scale that reads 0.1 g or 0.01 g.
How is this different from the clay batch recipe calculator?
This tool is built around glaze recipes written as a 100% base plus colorant and opacifier additions. The clay batch recipe calculator scales clay-body recipes written in parts or percentages.
Does this tell me if a glaze is food safe or will fit my clay?
No. It only converts percentages into dry weights. It does not check chemistry, melting temperature, glaze fit, crazing, leaching or food safety. Test-fire on your own clay and seek proper testing for functional ware.
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