Perfume Concentration Calculator
The perfume concentration calculator helps amateur and professional perfumers calculate the exact amounts of fragrance oil (or essential oil) and alcohol needed to create a specific concentration of perfume. Fragrance concentration is expressed as the percentage of fragrance material in the total blend. Industry-standard concentration categories include Eau de Cologne (2 to 4%), Eau de Toilette (5 to 15%), Eau de Parfum (15 to 20%), and Parfum (20 to 40%). This tool calculates how much fragrance and how much alcohol to weigh or measure for any bottle size and desired concentration.
Perfume concentration formula
Fragrance (ml) = Bottle size (ml) x (Concentration % / 100)
Alcohol (ml) = Bottle size (ml) - Fragrance (ml)
Fragrance (g) approx. = Fragrance (ml) x 0.93 (avg. FO density)
Standard fragrance concentration ranges: Cologne 2-4%, Toilette 5-15%, Parfum 15-20%, Extrait 20-40%. Figures may overlap between brands.
Frequently asked questions
What is the difference between Eau de Cologne and Parfum?
The terms refer to fragrance concentration. Eau de Cologne (EdC) is 2 to 4% fragrance in alcohol. Eau de Toilette (EdT) is 5 to 15%. Eau de Parfum (EdP) is 15 to 20%. Parfum (extrait) is 20 to 40%. Higher concentration means stronger, longer-lasting scent but also higher cost per bottle.
What type of alcohol is used in perfume making?
Perfumers use high-purity denatured ethanol (perfumer's alcohol), typically 190-proof or 200-proof ethanol. In the US, SDA Formula 40-B or 39-C are common perfumer's alcohol options. Isopropyl alcohol should not be used as it has a distinct odour that competes with the fragrance.
Do I need to add water to homemade perfume?
Traditional fine fragrance is made with alcohol only, no water. Some lighter fragrance sprays add a small percentage of distilled water (5 to 15%) to create a slightly different texture and mist pattern. Water can cause cloudiness if the fragrance is not fully soluble in the alcohol/water mixture.
How long should I let a homemade perfume macerate?
Most perfumers recommend letting a new fragrance blend macerate (rest) for 4 to 6 weeks in a cool, dark place before evaluation. The scent profile changes significantly as the alcohol mellows and the fragrance notes integrate. Impatient makers can evaluate after 48 hours but the final result will differ.
Is fragrance oil and essential oil the same for perfume concentration?
They are both considered the 'fragrance component' in concentration calculations. Fragrance oils are typically synthetic or blended aromatic compounds. Essential oils are extracted from plants. Both are measured by weight or volume as a percentage of the total blend. Many professional perfumers use a combination of both.
Sources
- IFRA (International Fragrance Association): IFRA Fragrance Standards and Safety.
- FDA: FDA - Fragrances in Cosmetics.
Reviewed by the CalculatorHub team, edited by James Graham, 14 June 2026. See our methodology.