Creating perfume isn’t just about choosing a beautiful fragrance oil — it’s about getting the concentration right. The ratio of fragrance oil to alcohol base determines the strength, longevity, projection, and overall character of the final scent.
If you're formulating for personal use or building a professional range, understanding these concentration levels is essential.
Eau de Cologne (EDC)
Fragrance Oil Concentration: 2% – 5%
Typical Ratio Example: 1:20 to 1:10 (oil to base)
Longevity: 1–2 hours
Projection: Light and refreshing
Eau de Cologne is the lightest concentration. It’s fresh, subtle, and ideal for hot climates or casual daytime wear. Because of the low oil percentage, it evaporates quickly and may require reapplication.
Best for: Citrus blends, fresh aquatics, body splashes, and after-shower sprays.
Eau de Toilette (EDT)
Fragrance Oil Concentration: 5% – 15%
Typical Ratio Example: 1:9 to 1:6
Longevity: 3–5 hours
Projection: Moderate
Eau de Toilette offers more presence than cologne while still remaining relatively light. It’s one of the most popular concentrations for everyday wear.
Best for: Daily perfumes, office-friendly scents, versatile signature fragrances.
Eau de Parfum (EDP)
Fragrance Oil Concentration: 15% – 20%
Typical Ratio Example: 1:5 to 1:4
Longevity: 6–8 hours
Projection: Stronger and more noticeable
Eau de Parfum strikes a balance between intensity and wearability. It offers depth, longer wear time, and stronger sillage without being overwhelming.
Best for: Retail perfumes, evening wear, long-lasting signature scents.
Parfum (Perfume)
Fragrance Oil Concentration: 20% – 30%
Typical Ratio Example: 1:4 to 1:3
Longevity: 8–12 hours
Projection: Rich and long-lasting
Parfum contains a higher oil concentration, resulting in deeper scent development and extended wear time. It often feels smoother and more rounded on the skin.
Best for: Premium ranges, winter scents, customers wanting stronger performance.
Extrait de Parfum
Fragrance Oil Concentration: 30% – 40%
Typical Ratio Example: 1:3 to 1:2
Longevity: 12+ hours
Projection: Deep, intense, and long-lasting
Extrait de Parfum is the most concentrated form commonly sold. It contains minimal dilution and delivers maximum richness and longevity. Because of its strength, it is usually applied sparingly.
Best for: Luxury collections, niche brands, statement fragrances.
Quick Reference Table
Important Formulation Tips
1. Always Mix in a Separate Glass Container
Avoid blending directly inside your final perfume bottle.
2. Allow Proper Maturation
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Freezer: 12–24 hours
or -
Cool, dark space: 5–7 days
This allows the oil and alcohol to bind properly.
3. Filter Before Bottling
Filtering ensures clarity and removes any particles or cloudiness.
4. Test and Adjust
After maturation, test the fragrance. Adjust by adding more base (to soften) or more fragrance oil (to intensify).
Choosing the Right Concentration for Your Brand
If you're building a perfume line, your concentration choice affects:
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Pricing strategy
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Target market
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Shelf stability
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Perceived luxury
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Performance expectations
For most commercial brands, Eau de Parfum (15–20%) is the sweet spot between performance and cost efficiency. Extrait is more premium, while EDT works well for lighter, everyday ranges.