Fragrance Concentration Levels Explained

Concentration is simply the percentage of perfume oil (the aromatic compounds) mixed with alcohol and water. More oil generally means a more intense smell, longer wear, and a higher price per ml. From weakest to strongest, the ladder runs like this:

Eau Fraiche (roughly 1 to 3% oil): Extremely light and short-lived, mostly water and alcohol. A quick refresher that fades within an hour or two.

Eau de Cologne (roughly 2 to 5%): The classic bright citrus splash, traditionally high in alcohol. Fresh but fleeting, often reapplied through the day.

Eau de Toilette (roughly 5 to 15%): The everyday standard. Noticeable, wearable, usually lasts a solid few hours, and easy on the wallet.

Eau de Parfum (roughly 15 to 20%): Richer and longer, commonly six to eight hours or more. The most popular tier for modern releases.

Parfum or Extrait (roughly 20 to 40%): The most concentrated, deep and long-lasting, and applied sparingly since a little goes a long way. Knowing where a fragrance sits on this ladder tells you a lot about how it will behave before you even smell it.

Most people assume the EDT and EDP of the same fragrance are just the weaker and stronger versions of one recipe. That is not quite how it works. Perfumers usually rebalance the formula between concentrations rather than simply diluting it, so the two often smell meaningfully different, not just louder or quieter.

As a rough pattern, EDT versions tend to emphasize the brighter top notes, so they read fresher, zippier, and more citrus- or aromatic-forward. EDP versions usually push the heart and base, so they come across as deeper, sweeter, warmer, and more rounded. Sometimes an EDP even adds notes the EDT does not have. This is why a person can genuinely love the EDT of a fragrance and dislike the EDP, or the reverse. The upshot: do not assume you know one from having smelled the other. Treat them as related but distinct, and test the specific one you plan to buy.

When you are buying decants, concentration should shape which size you pick, because the same number of milliliters behaves very differently across the ladder.

A strong Parfum stretches much further than a light EDT. If you only need a couple of dabs per wear from a potent extrait, a tiny 1ml to 2ml decant might last you weeks, while a breezy EDT you spray generously will run out fast at the same size. So think in terms of wears, not just volume: for a concentrated scent, go small; for a lighter one you will reapply, size up. It also affects value, since higher concentrations cost more per ml but deliver more scent per application. The whole point of decants is to sort all this out cheaply before committing to a bottle. For more on picking sizes, see decant sizes explained and how many sprays in a decant. Come test a few concentrations side by side; a free scent flight is a good place to start.