Every calculation the bench does for you
What is my formula really made of?
Each line counts at the strength of the bottle it was weighed from, so the concentration is the dilution-corrected aromatic mass over everything on the scale.
A line poured from a 10% dilution puts a tenth of its grams of material into the beaker and nine tenths of a solvent the formula never mentioned. Tick Solvent for the alcohol, DPG or IPM you add on purpose: a solvent counts toward the batch and never toward the aromatics.
| Material (optional) | Grams weighed | Bottle strength % | Solvent | Neat grams | Share of aromatics |
|---|
Add grams above and the totals appear here.
The arithmetic is the easy half. This page cannot know that line four is a 10% dilution, that two of these materials carry the same restricted molecule, or what any of it costs you per gram, because it has no shelf behind it. The bench keeps a strength on every bottle and recomputes all of that from the same corrected numbers. Open the bench, free, no account needed to start.
A perfume formula is mostly arithmetic, and arithmetic is where formulas quietly go wrong. A spreadsheet will do every one of these sums, but every formula in it is one typo from silently wrong: the percentages, the dilution maths and the allergen totals are all yours to build and yours to break, and a mistyped cell fails silently. The bench does the same sums with the material data already underneath, and every calculation on this page is in the free tier, the same calculation a paying user gets.
Which calculations does the bench do for you?
Batch scaling, dilution-corrected doses, concentration, IFRA ceilings, allergen totals, the cost breakdown, the overpour rescale, equalizer gram moves and profile weighting.
| Calculation | What it saves you from |
|---|---|
| Batch scaling. Any batch size from the same formula, exact to the milligram, in one step. | Scaling a 5 g sketch to 500 g by hand, line by line. |
| Dilution-corrected doses. Every dose is counted at the strength of the bottle it is actually weighed from: a line poured from a 10% solution counts for a tenth of the same gram taken neat, and where your only bottle of a material is a dilution, the weighed mass is multiplied up so the formula stays true. | Solvent maths, the most common way a spreadsheet goes quietly wrong: juggling bottles at 1%, 10% and 50% and getting it almost right. |
| Concentration. A derived, adjustable quantity, so the alcohol moves with the batch rather than being recalculated by hand. | Re-deriving the alcohol every time the batch size or the strength changes. |
| IFRA ceilings on real strength. Limits are judged against the finished product at your chosen concentration, every dose corrected for its dilution, and one restricted molecule arriving from several naturals summed once across all of them, against the indicative Category 4 set (fine fragrance on skin; verify against the official standards before you sell). | A check done on weighed grams rather than on what those grams actually contain. |
| Allergen totals. The EU allergen declaration, computed from the formula and ready for the label. | Hand-tracing allergen totals across every line, which a blank sheet leaves entirely to you. |
| Cost breakdown. Ranked by which lines carry the cost, and naming the unpriced lines. | An estimate that looks complete while three lines have no price on file, so it is never quietly wrong. |
| The overpour rescale. At the weighing bench, the first overpour offers to rescale everything still to come. | Ruining a batch for one heavy hand, or starting it again. |
| Equalizer gram moves. "More mossy, less smoky" becomes concrete gram moves on real mass arithmetic, x = M(t-s)/(1-t) for a pure material, chosen only from bottles you own. It says when a material cannot reach the target instead of pretending. | Retuning by feel, one guessed nudge at a time. |
| Profile weighting. Every note in the scent profile is weighted by its dilution-adjusted aromatic mass. | A chart that counts a line weighed from a 10% solution as if it were neat material. |
Which of those calculations matters most?
Nearly every sum above turns on one correction: the strength of the bottle a line is actually weighed from. Get that right once, in the software, and the doses, the concentration, the compliance ceilings and the profile all inherit it; get it almost right in a spreadsheet and everything downstream is almost right too, which is worse than wrong because nothing flags it. The teaching version of that correction, with the working shown, is at the dilution calculator guide.
What does the arithmetic cost?
Nothing. Every calculation here is in the free tier, which does not expire and asks for no card, and the paid version buys room to work rather than better sums: Lifetime Unlimited is a one-time purchase, not a subscription. The prices live on one page, and the comparison page shows how the other tools charge for theirs.
The quickest proof is a formula of your own: paste one in, or build one, and watch the sums follow. Open the bench.