Fifty tubes to fill tonight — and the pot needs one number first.
Enter your tube count and fill weight to get the grams to melt, pour loss included, then scale your percent recipe to grams and see what each tube really costs. Everything stays in your browser.
The pour
Your recipe (percents)
The pack
The numbers here are yours to check. This page does arithmetic on what you type — it cannot see your recipe, your equipment or your batch.
Want it to remember?
In MadeKeeper the wax, butters and oils you melt come out of inventory the moment you log the make, the tubes you fill set the unit count, and the cost per tube lands in your ledger where your pricing can see it. See for bath & body makers or poke around the live demo. $19/mo for the whole back office, kept for as long as you stay. The shop stays free for cost a piece and one fair — no product cap. The tax packet, Etsy and Square, and more fairs are the $19.
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The batch-math questions balm, lotion-bar, and salve makers actually argue about, answered straight.
Why isn't tubes times fill weight enough?
On paper, 50 tubes at 4.5 g is exactly 225 g. In practice the pour always loses a little — a film stays on the pot walls, the pipette holds some back, and the last tubes come up short. So the calculator adds an overage on top, 10% by default, which turns those 50 tubes into 247.5 g to melt. Scraping a bit of extra out of the pot beats re-melting a partial batch for the last three tubes.
Why is the pour-loss overage a setting instead of a fixed number?
Because makers genuinely argue about it, and the pot decides who's right. A pour pot with a clean spout in a practiced hand might lose 5%; a wide saucepan and a pipette can run closer to 15%, and everything in between has its defenders. We default to 10% as a workable middle, but it's your setting — dial it to what your equipment actually leaves behind. And notice the overage rides into your cost per tube, because you paid for the film on the pot too.
What if my percents don't add up to 100?
Then the calculator says so and leaves your numbers alone. Rows totaling 98 are reported as 98, and each row scales at its own percent — 25% beeswax of a 247.5 g batch is 61.9 g no matter what the other rows do. Quietly stretching everything to force a 100 would rewrite your formula without telling you, which is exactly the thing a calculator has no business doing. If 98 was a typo, fix the row; if that's how you wrote it, the math respects it.
How much flavor or essential oil can I add per batch?
That's a usage-rate question, and this page only does arithmetic. Usage rates come from your suppliers' documentation for the specific material you bought, in the specific product you're making — that's the place to get your number, not a batch calculator. Once you have it, enter it as a percent row like any other and it scales with the rest of the batch.