Wick Size Calculator

As Container Diameter increases, Wick Size Number rises through the calculator's diameter brackets, because a wider wax pool needs a hotter, larger wick to fully melt out to the edges -- up to 4 inches, while a single wick is still doing the job. Past 4 inches, Number of Wicks increases from one to two, and each wick is then sized against roughly half the container's diameter instead of the full width, so Wick Size Number drops back down before climbing again as the container keeps getting wider -- two smaller wicks sharing the pool, not two wicks each sized as if it alone had to melt the whole thing.

Wick Series follows Wax Type directly: Soy is mapped to the ECO series and both Paraffin and Coconut are mapped to the CD series, reflecting how those wick constructions are built to burn cleanly in each wax's melt characteristics. Wax Type is the only input that determines which series applies at all -- Container Diameter and Fragrance Load only affect the size number within whichever series Wax Type selects.

Above an 8% Fragrance Load, the calculator adds one size to the recommended Wick Size Number, because fragrance oil doesn't burn -- it cools the wax pool and can smother a wick that was only sized for unscented (or lightly scented) wax. Below that threshold, Fragrance Load doesn't change the recommendation at all.

Wick sizing charts are a starting point, not a guarantee, because real burn performance also depends on container material, ambient temperature, and your specific fragrance oil's cooling effect. Test Range Low and Test Range High bracket two sizes below and above the recommendation so you can burn-test a small set of candidates and pick whichever one actually produces a full, clean melt pool without smoking or tunneling.