Candle Wax Calculator — Wax + Fragrance Weight

Real-world use cases

• Size a single batch before you melt anything

  You have a dozen 8 fl oz jars and a 5 lb bag of soy wax, and you want to know if the bag covers the batch. Punch in 8 fl oz, 12 jars, 90 percent fill and 0.9 density. The total wax tells you the bag of 2268 grams comfortably covers roughly 2290 grams needed only if you drop to fewer jars — so you learn before melting that twelve jars is one bag short, not after you have committed the wax.

• Scale a recipe up for a craft fair order

  A test pour worked at one jar. Now a fair wants fifty. Keep the same jar volume, fill rate, density and fragrance load, change the count to fifty, and read the total wax and total fragrance oil for the whole order. Copy the recipe so your shopping list for wax and oil is exact, with no per-unit multiplication done in your head at midnight.

• Switch waxes without reworking the math

  You are moving a soy recipe to beeswax. Beeswax is denser, about 0.96 versus 0.9, so the same jars need more wax by weight. Change only the density field and the per-container and total wax update immediately, showing exactly how much extra beeswax the swap costs you per jar and across the batch.

• Dial in fragrance without oiling out

  You suspect your last batch seeped because the fragrance load was too high. Enter the wax weight you used and try 8, then 10, then 12 percent. The tool flags the 12 percent figure as over the usual ceiling and shows the gram difference, so you can settle on a load your wax can actually bind before the next pour.

Common pitfalls

• Treating volume as weight. A jar that holds 200 mL does not hold 200 grams of wax — wax is lighter than water, near 0.9 g/mL, so 200 mL is about 180 grams at full fill. Skipping the density step overstates your wax by roughly ten percent every time.

• Forgetting the fill rate. Filling to the brim leaves no head space, so the candle has no clean shoulder and no room for the wax to settle. Calculating at 100 percent also overbuys wax. Pour to about 90 percent and calculate at 90 percent so the numbers match the jar.

• Reading fragrance load against the total instead of the wax. The load is a percent of wax weight only. If you take 8 percent of the combined wax-plus-oil figure you add too little oil, and a weak scent throw is the result. Apply the percent to the wax weight, which is what this tool does.

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