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Pouring wax into glass jars

Jar Fill Calculator for Candle Making

Knowing exactly how much wax your candle container holds is one of the most important steps in developing a consistent candle recipe. Different jars, tins, and vessels all hold different amounts of wax depending on their diameter and height. This jar fill calculator helps candle makers determine the correct wax fill weight so fragrance load and wick testing can be calculated accurately. Whether you are testing new vessels or scaling a candle recipe, understanding your jar fill weight ensures reliable and repeatable candle production.

Candle Maker's Tools · No. 07

Candle Jar Fill calculator.

Vessel volume in, wax weight out. Pick your wax, set a fill ratio for headspace, and dial fragrance load — densities and melt expansion are handled for you.

Vessel volume
Capacity in fluid ounces (melted)
fl oz
1 fl oz24 fl oz
Fill ratio
Leave headspace for the wick top
%
70%100%
Wax type
Fragrance load
Percent of total pour
%
1%15%
Jar fill
Wax7.45 oz
Fragrance oil0.65 oz
Headspace0.90 fl oz
Pour weight
8.10oz
Wax needed
7.45oz
Fragrance oil
0.65oz

Vessel volume is the manufacturer's fluid-ounce rating, which reflects melted capacity. Calculator accounts for ~10% volume contraction as wax cools to solid. Always verify against your supplier's spec sheet — densities are working averages.

Recommended Vessels for Testing

If you are comparing jar sizes or testing fill weights, it helps to use consistent vessel styles. Browse candle vessels, take a look at the 8oz Aura vessel, or compare the 12oz Aura vessel when building repeatable formulas.

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The systems behind fragrance formulation, wax selection, pricing, and candle brand development are explored in depth inside the Six Figure Wick ebook.

Explore the Book →

Disclaimer:
All calculators are provided for informational and educational purposes only. Results are generated solely from user-entered data and represent mathematical calculations, not formulation, safety, or business advice. Users are responsible for verifying supplier guidelines, performing appropriate testing, and ensuring product safety and regulatory compliance. By using the tools, you acknowledge that the creator assumes no liability for product performance, safety outcomes, misuse, or business losses resulting from its use.

Please review our full  Tools Disclaimer.

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