Beauty Calculators
Perfume dilution.
Two jobs in one place. Make a batch: enter the strength you want and the batch size to get ml of concentrate and solvent. Or dilute: enter what you have and the lower strength you want to get the solvent to add. Volume percent, your numbers. Runs in your browser.
What do you need?
Amounts
Fill the form and press Calculate.
Worked example
Make: 30 ml at 15% from pure fragrance oil = 30 x 15 / 100 = 4.5 ml oil and 25.5 ml perfumer’s alcohol. Dilute: you have 50 ml at 20% and want 12%. Solvent to add = 50 x (20 / 12 - 1) = 33.3 ml, for 83.3 ml at 12%. Check: 50 x 20 = 83.3 x 12 = 1,000.
How it works
Make: concentrate ml = batch ml x target % / concentrate strength %. Solvent ml = batch ml minus concentrate ml.
Dilute: the amount of fragrance stays the same, so start ml x current % = final ml x target %. Solvent to add = start ml x (current % / target % - 1).
Both are volume percent (C1 x V1 = C2 x V2). Alcohol and water, and some oils, do not add to exactly the sum of their volumes, so the final measured volume can come out slightly under. Weigh-based recipes use weight percent instead; do not mix the two. No official standard defines eau de toilette, eau de parfum or parfum percentages, so every target here is a number you choose.
Safety is not calculated. Fragrance materials have usage limits set by category and by regulation. Check your supplier's safety data sheet and the IFRA Standards for the materials you use, and test on a small area before wearing a new blend.
Sources and basis (checked 2026-10-04): IFRA Standards (International Fragrance Association) for usage limits; dilution formula is C1 x V1 = C2 x V2 (volume percent), the standard dilution relation in analytical chemistry.
FAQ
What is the fragrance oil to alcohol ratio for perfume?
It is whatever percentage you choose. For a 15% blend, mix 15 ml of oil with 85 ml of alcohol per 100 ml, so a ratio of about 1 part oil to 5.7 parts alcohol. There is no official ratio for named strengths such as eau de parfum.
Can you dilute perfume?
Yes, by adding a solvent such as perfumer’s alcohol. The calculator gives the volume to add for a lower percentage. It cannot tell you how the scent will change, and water or the wrong alcohol can make a blend cloudy.
Is it volume or weight percent?
This tool uses volume percent. If your recipe is in grams, weigh the ingredients and use weight percent throughout instead, or use our formula scaler.
What if my concentrate is already diluted?
Enter its strength in the optional field. A 50% concentrate needs twice the volume of a 100% oil for the same final strength.
Does this check IFRA limits?
No. Usage limits depend on the materials and product type. Use your supplier’s documents and the IFRA Standards.