Decant Sizes Explained: 5ml, 10ml and 30ml

The most common question we get is also the most practical one: how much fragrance is actually in a decant, and how long will it last? Here are real numbers rather than vague reassurance.

Sprays per size

A standard atomizer delivers roughly 0.1ml per spray. That gives you approximately 50 sprays from a 5ml, 100 from a 10ml, and 300 from a 30ml.

Treat those as approximations rather than guarantees. Pump quality varies, some atomizers deliver a finer mist than others, and the last few tenths of a millilitre are difficult to get out of any sprayer. If a seller quotes you exact spray counts to the unit, they are guessing with more confidence than the physics allows.

How long that actually lasts

Most people use three to five sprays per wearing. At four sprays, that works out to roughly:

A 5ml gives you about twelve wearings — two to three weeks if you reach for it regularly, or a couple of months as an occasional fragrance. A 10ml gives you around twenty-five wearings, comfortably a season. A 30ml gives you seventy-five or so, which for most people is a year or more of real use.

If you spray heavily, halve those numbers. Some fragrances also demand more sprays than others — a light citrus needs reapplying, while a dense amber or oud can be overwhelming at more than two.

Which size to buy

The right size depends on what you are trying to find out, not on what seems like good value.

Buy 5ml when you are testing. You want enough wearings to see a fragrance in different weather, on different days, around different people. Twelve wearings is enough to know. It is not enough to get bored, which is the point — you are gathering information, not committing.

Buy 10ml when you already know you like it but are not ready to spend three hundred dollars, or when you want a fragrance for a specific season without owning it year-round.

Buy 30ml when it has earned a place in your rotation. At this size you are past testing and into ownership, and the per-millilitre cost has dropped enough that it competes seriously with buying the bottle.

The trap with the smallest sizes

Some sellers offer 1ml and 2ml decants at very low prices, and they are tempting. The problem is that two or three sprays is not a test — it is a first impression, and first impressions in fragrance are famously unreliable. Plenty of fragrances that are startling on day one become favourites by day ten, and plenty that dazzle immediately are exhausting within a week.

If you are going to spend money finding out whether you like something, spend enough to actually find out.

A note on cost per millilitre

Decants always cost more per millilitre than the bottle they came from. That is not a markup on the fragrance — it is the cost of the atomizer, the labelling, the labour of filling it, and the fact that a bottle bought at retail has to be paid for in full before a single decant is sold.

What you are buying is not cheaper fragrance. It is the ability to be wrong about a fragrance for twenty-six dollars instead of four hundred. We worked through the maths if you want to see where the crossover point sits.

New to this? Start with what a perfume decant is.