Wax Melt Calculator

In short Wax melts are a packing problem rather than a filling one, and there is one trap in it. A clamshell cavity is quoted by what it HOLDS, and what it holds is wax PLUS fragrance. At a 10% load a 20 gram cavity is 18.18 grams of wax and 1.82 grams of oil. So 900 grams of wax fills 49 cavities, not the 45 you get by dividing 900 by 20 — that division treats the fragrance as though it were wax and UNDER-counts by the whole load. Getting the direction wrong is how a tray comes up short at the end. From there it is whole packs and a remainder. 49 cavities at six to a clamshell is eight full packs and one loose cavity, using 890.9 grams of wax and 89.1 grams of oil, and leaving 9.1 grams in the pot. Those spare cavities are the awkward part of a melt batch — not enough to sell, too good to throw out — and planning the batch around whole packs is usually worth a few grams of waste. MELTS RUN AT A HIGHER LOAD THAN CANDLES, and the reason is structural rather than a matter of taste. There is no wick and no flame, so the oil is released by a warmer rather than burnt off, and the same wax will usually carry more of it. The ceiling is still a ceiling, though: past the point where the wax holds the oil it weeps, and a weeping melt makes a mess in the warmer instead of in the jar. There is a second, quieter loss worth measuring once. Wax clings to the pouring jug — a few grams every pour — and on a small batch that can exceed the leftover the arithmetic shows. Weigh your jug empty and full once and you will know whether it matters to you. What this page does not do is judge the melt. It counts cavities and grams. It says nothing about how long a melt lasts in a warmer, how strongly it will scent a room, or whether your wax suits melts at all — a soft container wax makes melts that are difficult to pop out of the clamshell, and that is a property no calculator can see.