Buy the largest size you are confident you will finish while it is still at its best — and no larger. For a perfume you have only sampled, that usually means a small bottle (around 30 ml) or a travel spray; for a proven favourite you wear daily, a larger bottle (50–100 ml) is often better value. Bigger bottles usually cost less per millilitre, but a perfume that changes on the shelf before you use it is no bargain. Most perfumes keep well for years if stored cool and dark, but light, citrus-led perfumes are best used sooner.

The common sizes

Sizes vary by brand, but these are typical:

  • Samples (about 1–2 ml) — a vial or small spray; a few wears. See Perfume Samples and Decants.
  • Travel sprays and minis (about 5–15 ml) — enough for a trip or to wear for a few weeks.
  • Small bottles (about 30 ml) — a good first full size.
  • Medium bottles (about 50 ml) — the most common "standard" size.
  • Large bottles (about 75–125 ml) — for perfumes you wear often.
  • Very large or refill bottles (150 ml and up) — for devoted, frequent wear. See Refillable Perfume.

How long does a bottle last?

That depends on how much you use. A spray typically delivers a small fraction of a millilitre, so even a 30 ml bottle holds a few hundred sprays. As a rough guide:

  • Two or three sprays a day, every day — a 30 ml bottle may last a few months; a 100 ml bottle, a year or more.
  • Occasional wear — a 30 ml bottle can last years.

Actual numbers depend on the sprayer, so treat these as estimates. If you own several perfumes and rotate them, each bottle lasts much longer — which is a reason to buy smaller sizes. See Building a Fragrance Wardrobe.

A bottle is the right size when its last spray smells as good as its first.

Will it keep that long?

Perfume does not have a fixed expiry date, but it does change with age, heat, light and air. A bottle that is opened often has more air inside as it empties. Most perfumes kept closed, cool and dark stay good for years; fresh, citrus-heavy perfumes tend to change sooner than woody or amber ones. See Does Perfume Expire? and How to Store Perfume.

So if you wear a perfume only occasionally, a smaller bottle is the safer choice, even if the larger one is cheaper per millilitre.

When bigger is better value

  • You have worn the perfume for weeks from a sample or small bottle, and still love it.
  • You wear it most days.
  • It is a sturdy composition — woody, amber, musky — that keeps well.
  • You can store it properly, away from heat and light.

When smaller is better

  • You have not worn it for long. Taste can change after the first week.
  • You own several perfumes and rotate them.
  • It is a light citrus or cologne-style perfume that is best fresh.
  • You travel and want to carry it. Rules on carrying liquids apply; see Can You Bring Perfume on a Plane?.
  • It is a gift for someone whose taste you are guessing. See How to Choose Perfume as a Gift.

Splitting a large bottle

If you own a large bottle, decanting a little into a small atomiser lets you carry it and keeps the main bottle closed more often. See How to Decant Perfume Into a Travel Atomiser.

Sizes on the RUŌOD site

Where a perfume in the RUŌOD collection is offered in more than one size, its page lists each size with its own price and availability, so you can start small. The general advice on buying — where, what to check, and when to be cautious — is in How to Buy Perfume.

Common questions

Is a 100 ml bottle better value than 50 ml?

Usually per millilitre, yes — but only if you will use it while it is at its best.

How many sprays are in a 50 ml bottle?

Several hundred, depending on the sprayer. Treat any exact figure as an estimate.

Should I buy a large bottle of a perfume I have never worn?

It is risky. Wear a sample or small bottle first.

Does a bigger bottle go off faster?

Not by itself, but a bottle that takes years to finish spends longer exposed to air and temperature changes. Good storage matters more than size.