Wax Melt Calculator: Wax and Fragrance for Clamshells and Molds

Why melts deserve their own math

Wax melts look simple: no wick, no jar, pour and pop out. That is exactly why they are popular with new sellers and why so many shops add them beside their candles. The math is a little different, though. You are working with a small unit, usually a clamshell of six cubes, so a small error per clamshell multiplies quickly across a batch of fifty. And melts are often poured in a different, harder wax than your containers, with its own fragrance ceiling.

Finding your clamshell weight

Clamshells are sold by cavity count and shape, not by weight, so the listing often does not tell you how much wax one takes. The easiest fix: weigh one you have already made. If you have not made any yet, set the empty clamshell on a scale, tare it, fill each cavity with water to where the wax will stop, and multiply the reading by 0.86. That is the finished melt weight, wax plus oil. Enter it once and keep it for every batch.

How far a pound goes

The result shows how many clamshells you get from one pound of wax, after the fragrance takes its share. It is the number you need for pricing: divide the price of a pound of wax by it and you have the wax cost per clamshell. The cost and price calculator does the rest of the costing, including Etsy fees.

Fragrance load in melts

A common belief is that melts can take any amount of fragrance because there is no flame. The wax still has a limit to how much oil it can hold. Beyond it, oil beads on the surface, soaks into packaging and makes the melt soft. Golden Brands 494, a popular tart and melt wax, is listed at a 10% maximum by both Lone Star and Fillmore Container. Choose your wax above and the calculator checks your load against those figures.

Watch the packaging

If oil marks appear on the clamshell or on a paper label after a few days, the load is too high for that wax or the oil was added too cool. Try a lower load before you try a different wax.

Pouring melts well

Pour at the temperature your melt wax recommends; many melt waxes like it hotter than container soy, often 150–160°F.
Fill each cavity to the same level so the cubes break evenly and look tidy in the shop photos.
Let them set fully at room temperature before snapping the lid closed, so condensation does not form inside.
Melts still need to cure. Give them the same cure time you give your containers before judging scent strength.

Read our guide

Five things people get wrong about wax meltsWax melts look simple, which is why the same mistakes keep coming up: fragrance load, wax choice, measuring clamshells, curing and labels.

Questions makers ask

How many wax melts does a pound of wax make?

It depends on the size. A standard 6-cavity clamshell filled to about 2.6 oz uses about 2.4 oz of wax at a 10% load, so a pound of wax makes nearly seven clamshells. Small single cubes of about 0.5 oz each give around 35 per pound.

What fragrance load do wax melts use?

Melt waxes such as Golden Brands 494 are listed at a maximum of 10% by the shops we checked. Many makers push melts higher because there is no wick, but going past what the wax can hold leads to oily, sweating melts. Check your wax first.

Can I use container soy wax for melts?

You can, but container waxes are soft and melts made with them can stick to the clamshell and lose shape in warm weather. Melt and pillar waxes are harder and release more cleanly.

How do I find the fill weight of a clamshell?

Weigh a finished melt from a previous batch, or fill a clamshell with water to the level you want, weigh the water, and multiply by 0.86.

Do wax melts need a label?

If you sell them in the US, yes: a net weight, your business name and address, and safe use warnings for melt warmers. The label net weight calculator gives you the correct net weight line.

Sources we checked

Numbers last checked 2026-10-21. How we check them. If your supplier says something different, tell us.