Fragrance formulas are usually written in parts per thousand (‰) or percent of the concentrate. This tool converts those parts into grams, ml and drops for a finished batch at a chosen dilution.
Each row is one material. The defaults of 0.9 g/ml and 20 drops/ml are editable, and each row accepts its own density. The formula is stored in this browser.
| Material | Parts (‰) | g/ml | % conc. | % batch | ml | g | Drops | / 10 ml Price | Cost |
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The "% batch" column is each material's level in the finished product. Compare it with the IFRA Standards limit for the right product category (IFRA groups products, for example fine fragrance on skin, rinse-off products, candles) and with the dermal limit on each oil page. The calculator does not check these limits. General rules are on Safety and Phototoxicity.
Concentrate and batch. The parts in the table add up to the concentrate, counted as 100%. The dilution sets how much of the finished batch is concentrate. A 50 ml batch at 20% holds 10 ml of concentrate and 40 ml of alcohol or carrier.
Per mille and percent. In ‰ mode the ideal total is 1000; in % mode it is 100. If the total differs, rows are rescaled proportionally and the real total is shown.
Volume and mass. The maths is volume based: ml times density gives grams. Professional formulas are usually weighed in grams; in that case enter each material's real density for closer ml and drop figures. Essential oil densities commonly fall between 0.85 and 1.05 g/ml; some, such as cinnamon, clove and benzoin, are heavier than water.
Drops. 20 drops per ml is a common convention, also used in Blending 101. Drop size shifts with viscosity, temperature and dropper type, by about 20 percent. For small amounts, weighing is more accurate than counting.
Cost. Enter each material's price per 10 ml; row cost is ml divided by 10 times price. Currency is whatever is entered.