Glaze

Glaze Recipe to Percentage Converter

Convert a glaze recipe written in grams or parts by weight into percentages normalised to 100. Enter up to 12 ingredients and get a percentage breakdown instantly.

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Enter each ingredient name and its weight. The calculator will normalise all weights to 100%.

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Results

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Enter your measurements above and click Calculate.

Converting Glaze Weights to Percentages

Glaze recipes are most usefully expressed as percentages because percentages scale to any batch size. If a recipe is written in grams, a simple normalisation converts it to 100-part form.

The Formula

Ingredient % = (ingredient weight ÷ total batch weight) × 100

The sum of all ingredient percentages will always equal exactly 100%. This is the standard "unity" form used in all glaze chemistry references.

Why Percentages Matter

  • A percentage recipe works for 100 g, 500 g, or 10 kg — no recalculation needed.
  • Percentages let you compare two glaze recipes regardless of batch size.
  • Glaze databases (Digitalfire, Glazy) store recipes in percentage form.
  • Percentage recipes are required input for glaze chemistry (UMF) calculators.

Scaling a Percentage Recipe

Once you have percentages, use the Glaze Batch Calculator to scale to any target weight. Enter the percentages and your desired batch size to get ingredient weights in grams.

Note: Colorants and opacifiers added on top of the base glaze (e.g., "+3% iron oxide") are not included in the 100% base. Add these as separate additions after the base recipe is calculated.

Frequently Asked Questions

Why do I need to convert my glaze recipe to percentages? expand_more
A percentage recipe (normalised to 100 parts) can be scaled to any batch size — 100 g for a test, 5 kg for production. Raw gram weights from a one-time batch can't be used directly unless you always make the exact same batch size. Percentage recipes are also the standard form used in glaze chemistry software and ceramics databases like Glazy and Digitalfire.
Do colorants count in the 100% total? expand_more
It depends on convention. Most ceramicists express colorants as additions "on top" of the base recipe: e.g., "Base glaze 100% + 3% cobalt carbonate." If you include colorants in your weight total here, they will be mathematically part of the 100%, which is technically correct but differs from studio convention. Best practice: calculate the base separately, then note colorants as separate additions.
Can I use this for clay body recipes? expand_more
Yes. The same normalisation formula works for any ceramic recipe — clay bodies, slips, engobes, or terra sigillata. Enter the ingredient names and weights and the calculator will give you the percentage breakdown.
What if my percentages don't add up to exactly 100%? expand_more
The calculator always normalises the percentages to sum to exactly 100% based on the weights you enter. Any rounding in individual ingredient percentages will produce a sum within ±0.1% of 100. This is normal and acceptable for studio ceramics.