“How many drops of essential oil should I use?”
It sounds like such a simple question.
The slightly annoying aromatherapist answer is:
It depends!
Essential oils are highly concentrated, so understanding dilution is one of the fundamentals of using them safely. Rather than simply copying the number of drops from a recipe, it is much better to understand how dilution works and why we might choose one percentage over another.
What does an essential oil dilution actually mean?
When we talk about a 1%, 2% or 2.5% dilution, we are talking about the proportion of essential oil within the finished blend.
The remainder will usually be a carrier oil or another suitable base.
For example, a massage blend might contain essential oils diluted into a carrier oil such as sweet almond, grapeseed or jojoba.
The percentage chosen will depend on several factors rather than there being one dilution that is right for everybody.
Why don't we just use the same dilution every time?
Because the person, the essential oils and the purpose of the blend can all be different.
Before deciding on a dilution, an aromatherapist may consider things such as:
• the age of the person
• the area of the body where the product will be used
• how frequently it will be applied
• whether it is a leave-on or wash-off product
• the individual essential oils being included
• the safety information for those oils
• pregnancy
• skin sensitivity
• relevant health considerations
• the purpose of the blend
This is why learning percentages is far more useful than learning one universal number of drops.
Drops are not an exact unit of measurement
This is something that often surprises people.
A drop isn't a standard scientific measurement.
The number of drops in 1 ml can vary according to the viscosity of the liquid and the type of dropper being used.
You may therefore see different aromatherapy books, courses and dilution charts using slightly different drop calculations.
That doesn't necessarily mean that one person is right and everybody else is wrong.
It often means they are working from a different drops-per-millilitre assumption.
This is also why I teach dilution as a calculation rather than presenting a drop count as though it were an exact measurement.
Why percentages matter
Once you understand percentages, aromatherapy dilution starts to make much more sense.
Rather than thinking:
“I always put X drops into a massage oil.”
You start thinking:
“What dilution is appropriate for this particular blend?”
That is a much better habit to develop.
It also makes it easier to adjust a formulation when you change the amount of carrier oil.
If you make 10 ml one day and 50 ml another day, the number of drops changes — but the principle behind your chosen dilution doesn't.
What about pregnancy?
Pregnancy is an area where additional care and knowledge are particularly important.
Within my own teaching and resources, I use a conservative approach and generally work at a maximum 1% dilution during pregnancy, alongside appropriate essential oil selection and the other individual considerations that need to be taken into account.
You may come across different recommendations in aromatherapy literature, which is another reason it is important to understand the context behind a dilution rather than taking one figure in isolation.
A percentage alone does not tell you whether a blend is appropriate.
The oils themselves matter too.
More essential oil doesn't automatically mean a better blend
There can sometimes be a temptation to think:
“If a little is good, more must be better.”
That really isn't how aromatherapy works.
Adding more essential oil doesn't automatically make a blend more effective, and unnecessarily high concentrations may increase the potential for irritation or sensitisation.
A beautifully considered lower-concentration blend may be far more appropriate than simply adding as many drops as possible.
Aromatherapy is about thoughtful selection, not throwing half the essential oil box into the bottle!
Learn the calculation, then use your chart
I love a good reference chart.
They make life easier, particularly when you are working with several bottle sizes and dilution percentages.
But I also think you should understand what sits behind the chart.
That way, if you ever need a quantity that isn't listed, you aren't stuck.
This is exactly why I created my Essential Oil Dilution Guide & Quick Reference Chart.
It gives you an easy reference for commonly used quantities while also helping you understand the principles behind the numbers.
It is designed to be something you can keep handy when studying, blending or working in your therapy room.
Keep learning
Safe aromatherapy isn't about being frightened of essential oils.
It is about respecting their concentration and learning how to use them appropriately.
Once dilution starts to click, it becomes much less complicated.
And instead of asking:
“How many drops am I allowed?”
you begin asking the much more useful question:
“What is the appropriate dilution for this blend?”
That little change in thinking is a big step in becoming more confident with essential oils.
Karen x
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