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Eau de toilette vs eau de parfum
The difference is the share of aromatic compounds in the bottle: eau de parfum holds 15–20%, eau de toilette holds 5–15%. That single number drives both how intense the scent feels and how many hours it stays on skin.
Every concentration class is a range of aromatic compound share, and that share is the only number that predicts intensity and longevity.
Perfume oil is diluted in alcohol and water to reach a target strength. The resulting class — parfum, eau de parfum, eau de toilette — is nothing more than a band on that dilution scale.
Parfum or extrait carries 15–30% aromatic compounds, typically about 20% by IFRA figures. Eau de parfum holds 15–20%, typically about 15%. Eau de toilette holds 5–15%, typically about 10%.
Intensity and longevity of a fragrance rise with the percentage of aromatic compounds, the perfume oils used. Two bottles of the same size can differ by a factor of three in oil content.
Wear time scales with oil percentage: cologne fades in about 2 hours, eau de toilette in 2 to 4, parfum in 6 to 8.
Eau de toilette lasts from 2 to 4 hours. Perfume may last up to six or even eight hours. Cologne fragrance is released rapidly, lasting around 2 hours.
Esprit de parfum is a seldom-used strength of 15–30% sitting between eau de parfum and parfum, so its wear time sits in the same upper band as parfum.
These are typical figures for wear on skin. Skin type, application point and ambient temperature move the number within the band, but they do not change the ordering of the classes.
Match the row in the concentration table to the number of hours the scent must stay on skin, then read the percentage on the label.
Start from the hours you need, not from the bottle. If the scent must hold through a two-hour event, eau de toilette at 5–15% covers it; if it must survive a full evening, eau de parfum at 15–20% is the lower bound.
Once the row is picked, check the label: the class name implies the band, and intensity rises with the oil percentage inside that band.
The common failure is judging longevity by the bottle size or the price. A 100 ml eau de toilette still holds only 5–15% oil, while a 30 ml parfum holds 15–30% — volume says nothing about hours.
A bottle of eau de parfum and one of eau de toilette can hold the same volume, and still differ by the share of perfume oil dissolved in it.
| Class | Aromatic compounds | Typical figure | Wear time on skin |
|---|---|---|---|
| Parfum / extrait | 15–30% | about 20% | 6–8 hours |
| Esprit de parfum | 15–30% | seldom used | upper band, same as parfum |
| Eau de parfum | 15–20% | about 15% | longer than eau de toilette |
| Eau de toilette | 5–15% | about 10% | 2–4 hours |
| Cologne | below eau de toilette band | released rapidly | around 2 hours |
| IFRA reference for parfum | 15–30% | about 20% | up to 8 hours |
| IFRA reference for eau de toilette | 5–15% | about 10% | 2–4 hours |
The full scale, from parfum at 15–30% down to cologne, with the wear time each band delivers.
Reading the classes as one ordered list makes the trade-off explicit: each step down the scale buys more sillage spread and less time on skin.
Esprit de parfum occupies the same 15–30% band as parfum but is a seldom-used strength, so most labels jump straight from eau de parfum to parfum.
Class name gives the band; skin, application and temperature decide where inside the band the wear time lands.
Two products both labelled eau de toilette can sit at 5% or at 15% oil — a threefold difference in intensity and a visible difference in hours.
The band is the contract, the exact percentage is the product. Where the label states a figure, that figure beats the class name.
Percentage bands: IFRA figures. Historical anchors: excavated ancient perfumery, medieval perfume-making text.