How to Calculate Wax for Melts & Clamshells
Wax melts are one of the most popular maker products on Etsy, but getting the wax-to-fragrance ratio wrong means either a weak scent throw or an oily, sweating mess. Our calculator removes the guesswork so you can pour consistent batches every time.
The Math Behind Wax Melts
Unlike candles, wax melts do not have a wick to worry about. You convert cavity volume to wax weight using soy wax's specific gravity of 0.86. Then you layer in your fragrance load as a percentage of the wax weight. Multiply by the number of cavities in your clamshell and you have the full batch amount.
Why Fragrance Load Matters More for Melts
Because wax melts are wickless, you can typically push fragrance loads higher than you would in a container candle. Most soy wax brands allow up to 10-12% for melts. A higher load means stronger cold and hot throw, which is what customers are paying for.
Pro Tip: Always cure your wax melts for at least 1-2 weeks before testing scent throw. Freshly poured melts will not give you an accurate read on how strong the fragrance actually is once the wax has fully set.
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Frequently Asked Questions
How much wax do I need per wax melt cavity?▼
Most standard clamshell cavities hold about 1 oz of volume. Soy wax has a specific gravity of roughly 0.86, so each 1 oz cavity needs approximately 0.86 oz of wax by weight. Our calculator handles this conversion automatically.
What fragrance load should I use for wax melts?▼
Wax melts typically use a higher fragrance load than candles because there is no wick to clog. Most makers use 8% to 12%. Always check your wax manufacturer's maximum recommended load to avoid sweating or leaching.
Can I use this calculator for paraffin wax melts?▼
This calculator uses the specific gravity of soy wax (0.86). Paraffin wax has a slightly higher density (~0.90). For paraffin, the weights will be slightly higher per cavity, but the results are a close starting point.