Advanced Natural Perfumery Formula Calculator
Work out the true dilution and note balance of your complex perfume formulas
This tool allows you to enter multiple diluted ingredients, track how much essential oil is actually in each, and see your total dilution and note ratio breakdown. Need a quick overview tool? Use our Beginner-Friendly Dilution Calculator for basic blends and ratios.
| Material | Dilution % | Drops Used | Note (Top/Middle/Base) |
|---|---|---|---|
* Assumes 20 drops = 1 ml for dilution calculation purposes.
🛡️ Safety & EU Regulations: Using This Tool Responsibly
In the EU, essential oil usage in perfumes, cosmetics, and body products is highly regulated to protect consumers from sensitisation, phototoxicity, and irritation. These regulations are guided by IFRA standards, Cosmetic Product Safety Reports (CPSR), and the CLP regulation for labelling.
This calculator is a starting point to help you:
🔍 Estimate your essential oil concentration (as a % of the total product)
📊 Compare that percentage to known dermal limits
✅ Adjust your formula until it aligns with safe limits — especially for oils with restrictions (like Cinnamon Bark, Bergamot, or Clove)
⚠️ Example: Bergamot (Citrus bergamia)
EU IFRA limit for leave-on skin products: 0.4%
Let’s say you make a blend with 2 drops of Bergamot in 10 ml of carrier:
2 drops = 0.1 ml (20 drops = 1ml)
0.1 ml in 10 ml = 1% dilution
👉 This is above the safe limit!
Use the tool to either reduce the drops, or increase the carrier volume until you reach 0.4% or lower.
🌿 Where to Find Dermal Limits
We recommend checking:
IFRA Standards Library
Tisserand & Young’s Essential Oil Safety (2nd ed.)
Your Cosmetic Safety Assessor (for EU product compliance)
🧪 Rule of Thumb for Leave-On Products:
| Oil Type | Max Safe Dermal Limit |
|---|---|
| Cinnamon Bark | 0.07% |
| Clove Bud | 0.5% |
| Bergamot (non-FCF) | 0.4% |
| Lemon or Lime (cold-pressed) | ~0.7–2% (phototoxic) |
| Ylang Ylang | ~0.8–1% |
| Rose Absolute | ~0.6–1% |