How much fixative and DPG do you actually need?
Starting ratios for fixative, DPG, perfume oil and alcohol in a 100ml batch, what each ingredient does, and why more fixative does not mean longer wear.
In this guide
Two questions come up more than any others once someone has bought their first perfume oil. How much fixative should I add? And how much DPG do I need?
Most people believe more fixative automatically means a longer-lasting perfume. It does not. Perfume formulation is a balance, and too much of one thing costs you projection, clarity and the character you were trying to capture.
Perfume making should not feel like a secret formula, so here are the actual numbers.
What each ingredient is doing
Ratios are meaningless until you know what you are adjusting.
- Perfume oil
- The fragrance concentrate. It carries the aromatic compounds that make the smell: the oud, the rose, the vanilla, the musk. It decides the personality of the perfume, and its grade decides how long that personality lasts.
- Perfumer’s alcohol
- Alcohol blended specifically for fragrance. It dissolves the oil, sprays evenly, carries the scent through the air and evaporates without leaving a residue. Ready to use straight from the bottle.
- Ethanol
- The raw solvent underneath most perfume. Cosmetic-grade ethanol blends more cleanly and opens with less of a harsh alcohol bite than industrial grades. Cheaper by volume once you mix regularly.
- DPG
- Dipropylene glycol. A fragrance solvent and carrier. It blends ingredients smoothly, takes the edge off harshness, improves stability and slows evaporation a little. It is also the whole base for alcohol-free perfume oils and roll-ons.
- Fixative
- Slows fragrance evaporation, so the notes hold on skin and cloth for longer and the dry-down feels smoother. Real, but not magic.
The short version on the two alcohols: ethanol is the main ingredient, perfumer’s alcohol is a ready-to-use base built from it. The full comparison is here.
Starting ratios for a 100ml batch
There is no single formula that works for every fragrance, because oils behave differently. Heavy orientals need less help than light citruses. These are starting points to adjust from, not laws.
A strong eau de parfum
- 25 to 35ml perfume oil
- 60 to 70ml perfumer’s alcohol or ethanol
- 2 to 5ml DPG
- 1 to 3ml fixative
A lighter everyday spray
- 15 to 20ml perfume oil
- 75 to 80ml alcohol base
- 2 to 5ml DPG
- 1 to 2ml fixative
An alcohol-free perfume oil or roll-on
- 20 to 40% perfume oil
- The remainder as carrier, usually DPG
- No alcohol at all
Write down what you used. A blend you loved and cannot reproduce is not a formula, it is an accident. This is the single habit that separates people who sell perfume from people who made a nice one once.
How much fixative, really
The classic beginner mistake sounds reasonable: I want this to last 24 hours, so I will add plenty of fixative.
It does not work that way. Start at 1 to 3% of your total formula. For a 100ml batch that is 1ml, tested, then adjusted if it genuinely needs it.
How much you need also depends on what the fragrance is made of. These families already hold well and usually need less:
- Oud
- Amber
- Vanilla
- Musk
- Gourmand notes
These are lighter and fade faster, so they are where a fixative earns its place:
- Citrus
- Fresh and aquatic notes
- Many florals
And the thing no fixative fixes: if the oil was weak to begin with, no percentage rescues it. Longevity is bought when you choose the grade, not at the fixative stage.
How much DPG
Start at 2 to 5% of your total. For a 100ml batch, 2 to 5ml.
DPG helps the blend come together and softens a sharp opening. But it slows evaporation, and evaporation is what carries scent off your skin to somebody else, so too much of it quietly kills your projection. A perfume nobody else can smell is not a long-lasting perfume, it is a faint one.
Four mistakes that cost people their first batch
Adding too much fixative
The perfume goes heavy and dull. You lose the bright opening that made you like the scent in the first place.
Buying the cheapest alcohol
A poor base gives you a harsh opening, a lingering alcohol smell and a blend that never quite marries. It is most of what is in the bottle. Do not save money there.
Assuming more oil is always better
Higher concentration does not automatically mean better performance. Past a point you get a thick, muddled scent that projects worse than a balanced one at half the oil.
Judging it on mixing day
Fresh perfume smells sharp and unsettled. Give it a few weeks somewhere cool and dark and it comes back smoother, rounder and noticeably better. Plenty of people have thrown away a good formula because they smelled it an hour after mixing.
Which ingredients for which product
- A spray perfume: perfume oil, perfumer’s alcohol or ethanol, a little DPG, optional fixative.
- A perfume oil or roll-on: perfume oil and DPG. No alcohol.
- A luxury line: a higher grade of oil, a quality base, and the patience to mature it properly.
Balance is the whole answer
Long-lasting perfume is not one magic ingredient. It is quality oil at the right grade, the correct concentration, a clean base, proper blending, and fixatives and solvents used with restraint rather than enthusiasm.
Frequently asked questions
How much fixative should I add to 100ml of perfume?
Start with 1ml, which is 1% of the batch, and go up to 3ml only if testing shows it needs it. Heavier fragrances like oud, amber and vanilla usually need less; light citruses and aquatics need more.
How much DPG should I add to perfume?
Between 2 and 5% of the total, so 2 to 5ml in a 100ml batch. More than that starts slowing evaporation enough to reduce how far the scent projects.
Does more fixative make perfume last longer?
Only up to a point, and past it the perfume gets heavier and duller without lasting meaningfully longer. Longevity comes mostly from the grade and concentration of the oil you started with.
Can I use DPG and alcohol in the same perfume?
Yes, and most spray formulas do. The alcohol carries and projects the scent while a small amount of DPG smooths the blend and softens the opening.
What is the difference between perfumer's alcohol and ethanol?
Ethanol is the raw solvent. Perfumer's alcohol is a fragrance-ready blend built from it, so it is usable straight from the bottle. Ethanol is cheaper by volume once you are mixing regularly.
How long should I let perfume mature before using it?
A few weeks in a cool, dark place. The ingredients marry, the alcohol edge softens and the blend comes back smoother and better performing than it was on mixing day.
Ready to mix? Shop fixatives, DPG and perfume oils, or start with a Start your line pack that has the proportions already matched.