Top, Heart and Base Notes: How to Build a Balanced Fragrance Pyramid
Every perfume box seems to come with the same little triangle: bergamot at the top, rose in the middle, sandalwood and musk at the bottom. It's easy to dismiss the fragrance pyramid as a marketing graphic. But when you're writing your own formulas, it's one of the most useful tools you have for understanding why a perfume opens beautifully and then vanishes, or why it smells flat for the first ten minutes.
This guide explains what the fragrance pyramid actually describes, how to sort your materials into top, heart and base notes, which starting ratios perfumers commonly use, and how to check whether your formula is really balanced the way you think it is.
What Is a Fragrance Pyramid?
A fragrance pyramid (also called an olfactive or olfactory pyramid) organises the materials in a perfume by how quickly they evaporate and, therefore, when you notice them after application. The idea is usually credited to the French perfumer Jean Carles, who taught perfumery by grouping materials according to their volatility.
The pyramid has three tiers:
Top notes: the most volatile materials. They create the first impression and fade fastest.
Heart notes (or middle notes): they come through as the top notes fade and give the perfume its main character.
Base notes: the least volatile materials. They give depth, fix the lighter notes and carry the long dry-down.
The shape is a useful picture, not a law of physics. Every material evaporates continuously from the moment you spray, so all three tiers are present at once. What changes over time is which ones dominate.
Top Notes: The First Impression
Top notes are small, light, highly volatile molecules. On skin they are usually most noticeable in roughly the first 15 to 30 minutes, although some last longer depending on the material and the formula around them.
Typical top note families include:
Citrus: bergamot, lemon, sweet orange, grapefruit, mandarin.
Aromatic and herbal: basil, mint, eucalyptus and the brighter facets of lavender.
Green and fresh: galbanum, leafy and cut-grass notes.
Aldehydes and light fruity notes, used in small amounts for sparkle.
Their job is to draw someone in and set expectations for what follows. Because they disappear quickly, more isn't always better. Piling on citrus tends to produce a loud opening, a short life and an abrupt transition into the heart.
Heart Notes: The Character of the Perfume
Heart notes emerge as the top notes settle and stay noticeable for several hours. They define what the fragrance is "about". If you had to describe a perfume in two words, those words usually come from the heart.
Common heart note families include:
Florals: rose, jasmine, ylang-ylang, orange blossom, iris.
Spices: pink pepper, cardamom, clove, cinnamon.
Rounder aromatics and fruity notes with more staying power than the tops.
A good heart also acts as a bridge. It should connect the bright opening to the deeper base so the perfume evolves smoothly instead of switching abruptly from one smell to another.
Base Notes: Depth and Longevity
Base notes are the heaviest, least volatile materials. They can last for many hours on skin, and some, such as certain musks and woods, can still be detected on a smelling strip days later.
Typical base note families include:
Woods: sandalwood, cedarwood, vetiver, patchouli.
Resins and balsams: benzoin, labdanum, frankincense, Peru balsam.
Musks and ambery materials.
Gourmand bases: vanilla, tonka and similar notes.
Base materials often smell modest on a strip at first, but they slow the evaporation of the whole blend and hold the lighter materials together. A formula without enough base tends to float away before it can develop.
How to Sort Your Materials Into Top, Heart and Base
Classifying a material isn't always obvious, and different sources sometimes place the same material in different tiers. A few practical methods help.
Use your supplier's data and a reference library
Many suppliers list a note type, odour life or substantivity for each material. Use that as a starting point, and record the classification you decide on in your material library so every formula uses the same reference.
Do a smelling-strip test
Dip a strip for each material (diluted to a sensible strength) and smell them at intervals: straight away, after 15 minutes, after an hour, after a few hours and the next day. Write down when each one fades. Your own notes will be more useful than any generic list, because they reflect the exact grade you bought.
Expect materials that break the rules
Some materials don't fit neatly into one tier:
Lavender has bright top facets and a softer heart.
Some musks and ambery woods are base notes that project strongly from the start.
Rose and jasmine absolutes can carry well into the dry-down.
Many perfumers tag these by the role they play in a specific formula rather than by a fixed label.
Balancing the Pyramid: Common Starting Ratios
There is no single correct ratio, but several formulation guides suggest a conventional starting split of roughly 15 to 25% top notes, 30 to 45% heart notes and 30 to 50% base notes, measured as a percentage of the fragrance concentrate.
Treat these numbers as a place to start, not a rule. The style you're aiming for changes the shape:
Colognes and fresh citrus scents lean heavily towards the top.
Floral scents put more weight in the heart.
Chypres, orientals and woody ambers carry a heavier base.
Linear fragrances deliberately blur the tiers so the scent smells similar from first spray to dry-down.
A practical way to build your first draft
Decide the tier totals first. Choose roughly how much of the concentrate will be top, heart and base before picking individual amounts.
Start each material low. It's easier to raise a quiet material than to rescue a formula dominated by one strong ingredient. Potent materials should start at very small percentages.
Weigh, don't count drops. Drop sizes vary between materials and droppers, so weigh every ingredient in grams. Our guide to perfume dilution explains how to handle 10% and 1% solutions accurately.
Evaluate over time. Smell the blend on a strip and on skin at several points through the dry-down, not just in the first minute.
Record every change. Most beginners lose weeks by tweaking a formula, liking the result and then forgetting exactly what changed.
Count vs. Weight: Why Your Pyramid Might Be Wrong
A very common mistake is judging the balance by how many materials sit in each tier. Imagine a formula with five base notes at 1% each, three heart notes at 5% each and two top notes at 20% each. By count, it looks base-heavy. By weight, the base is only 5% of the formula, the heart 15% and the top 40%, with the rest being solvent. In practice, that perfume would open loudly and fade fast.
Dilutions make this even trickier. If you use a material as a 10% solution, adding 5 g of that solution only adds 0.5 g of pure material. To see your true pyramid, you need to total each tier by the effective pure amount of every material, not by the weight of the solution in the bottle.
The pyramid also sits inside the finished product. Once the concentrate is diluted into alcohol, its share of the bottle depends on the strength you choose. Our guide to perfume concentration percentages covers typical ranges for EdT, EdP and parfum.
Common Fragrance Pyramid Mistakes
Too many top notes. A bright opening with nothing underneath disappears quickly and feels thin.
A missing heart. Jumping from citrus straight to woods often creates a hollow gap in the middle of the dry-down.
An overloaded base. Too much base can make the opening muddy and heavy, hiding the top notes entirely.
Judging only on the strip at minute one. The pyramid unfolds over hours, so your evaluation has to as well.
Ignoring dilutions. Totals based on solution weight can make a tier look far stronger than it really is.
Visualising Your Fragrance Pyramid in ScentLabs
Calculating tier totals by hand in a spreadsheet works, but it gets tedious every time you adjust a material. The ScentLabs formula creator is built for this:
Visual olfactive pyramid: see how your formula is distributed across top, heart and base notes.
Per-ingredient dilution tracking: ScentLabs computes the effective pure contribution of each diluted ingredient, so your picture reflects the real composition.
Automatic percentages: change a weight and the percentages recalculate.
Linked versions: create a new version for each tweak and trace the formula's evolution in a family tree.
If you're still deciding which tool fits your workflow, our comparison of perfume formulation software looks at the main options side by side.
Frequently Asked Questions
What is a fragrance pyramid?
A fragrance pyramid is a way of organising a perfume's materials into top, heart and base notes according to how quickly they evaporate, which describes how the scent changes from the first spray to the dry-down.
What is the ideal ratio of top, heart and base notes?
There isn't one ideal ratio. A common starting point suggested in formulation guides is roughly 15 to 25% top, 30 to 45% heart and 30 to 50% base, adjusted for the style you want.
How long do top, heart and base notes last?
Top notes are usually most noticeable in roughly the first 15 to 30 minutes, heart notes for several hours, and base notes for many hours. The exact timing depends on the materials, their amounts and the concentration of the finished perfume.
Can a material be both a top and a heart note?
Yes. Materials such as lavender have facets that sit across tiers, and some musks project strongly from the start. Classify each material by the role it plays in your formula and by your own smelling-strip tests.
Do all perfumes follow the pyramid structure?
No. Many modern fragrances are linear, designed to smell similar throughout their life, and some are built around one dominant accord. The pyramid is still useful for understanding why those choices change how a perfume behaves.
Try ScentLabs Free
Building a balanced fragrance pyramid is easier when you can see every tier at a glance. Create a free ScentLabs account to write up to 10 formulas with 25 raw materials, with percentages calculated automatically. When you need more, upgrade to Pro for US$5.99/month or get Lifetime access for a one-time US$49.99.
Starting ratios and note timings in this article are general guidance from perfumery practice, not fixed rules. Always evaluate your own materials and formulas.