Free calculators
The sums worth getting right
Every one of these is a percentage of a percentage, which is why they go wrong quietly. Free, no sign-up, nothing to install, and nothing you type is sent anywhere: the arithmetic happens in your own browser.
-
Dilution calculator
Work out how much material and how much solvent to weigh for a dilution at any strength. By weight, which is the only way that is reproducible.
-
IFRA limit calculator
An IFRA limit is a percentage of the finished product, and you work in a concentrate. This converts between the two, in both directions, at any strength.
-
Batch scaling calculator
Scale a formula from one batch size to another, and find what any single line becomes. One factor, applied to everything, so the proportions cannot drift.
-
Bottle batch calculator
How much concentrate and how much alcohol to weigh out to fill a given number of bottles at a given strength, by weight rather than by volume.
-
Cost per bottle calculator
What a finished bottle costs to make: the concentrate, the alcohol and the packaging, worked from a price per kilo and a strength rather than guessed at.
-
Allergen threshold calculator
Whether a fragrance allergen crosses the EU declaration threshold, from its percentage of your concentrate and the strength you are bottling at.
-
Alcohol proofing calculator
How much water to add to bring perfumer's alcohol down from the strength you bought to the strength you want, worked by weight from a measured table of ethanol in water.
-
Drops to grams calculator
Turn a note written in drops into grams, from drops you weighed yourself with your own dropper and your own material. There is no standard drop, so this does not pretend to have one.
-
Flash point packing group calculator
The Class 3 transport packing group of a perfume, from its measured closed-cup flash point and initial boiling point. It does not estimate a flash point, because a mixture's cannot be worked out from its formula.
-
Shelf life calculator
The date an opened aroma material reaches the end of its useful life, from the class of molecule that dominates it and how it is kept. Cool storage doubles the figure.
-
Margin calculator
Margin and markup from what a bottle costs and what it sells for, and the price you need to reach a margin. The two words are not the same number, and pricing from the wrong one is expensive.
-
Perfumery unit converter
Grams, kilograms, ounces and pounds, milliliters, liters and both fluid ounces. It crosses between weight and volume only when you give it a density, because nothing else can.
The same arithmetic, across a whole formula
These do one material at a time. Orris Bench does every restricted material at once, through every natural and every bench dilution, and again the moment the formula changes. It is not on sale yet.