How Many Drops of Oil in Diffuser: The Ultimate Guide

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This is the complete guide to how many drops of oil in diffuser for optimum working and diffusion.

Looking to add some aromatherapy to your life? 

Using a diffuser is a great way to do just that! 

But how many drops of oil should you put in your diffuser? And what kinds of oils work best? 

Keep reading for the answers to all of your questions about using oil in a diffuser!

how many drops of oil in diffuser

How Many Drops Are In ml?

There are 20 drops in 1 milliliter.

1 drop = 0.05 mL

How many drops of oil in diffuser?

The idea of adding essential oil to your diffuser can be daunting, especially if you are not sure how much to use. Here is what you will need to know about the number of drops to put in an ultrasonic diffuser.

Essential oils are very concentrated and only a few drops will go a long way. 

This means that using just one or two drops will not spread the scent far enough throughout the room. 

Concentrated as they are, you will need at least three or four drops of essential oil per 100-milliliter (ml) capacity on your diffuser for it to work effectively. 

3~4 Drops Per 100ml capacity of the diffuser


For example, if your diffuser can hold 125 ml then 5 or 6 drops should use every time you operate the device. 

If you are using more than one essential oil at a time, then the combined total of drops should not exceed this amount.

You can refer to your user’s manual for an estimate on how much oil your diffuser takes before it runs out or becomes less effective.

However, this will depend on several factors like 

  • Type and quality of the diffuser
  • Mist intensity settings- which you can control based on your preferences, etc. 

Generally speaking though, most aromatherapy units would require between 4 and 10 drops either way.

Hidden Tips

  • Some people find it helpful to use distilled water instead of tap water for their diffusers, but this is entirely up to you.
  • A lower-quality or unbranded unit might require more oil than what is recommended because they do not diffuse scent as evenly or intensely as those made by reputed brands. 

How Many Drops of Essential Oil in a mL Diffuser?

There are approximately 20 drops of essential oil in a 15 milliliter (mL) diffuser.

Essential oils vary significantly in viscosity, so 1 mL could contain more than 20 drops of some oils or less than 20 drops of other oils. 

For example, 1 mL of Cedarwood Atlas contains only 12 drops according to the supplier’s specification sheet. 

  • However, 1 mL of Jasmine contains 32 drops based on the supplier’s own analysis chart (and my personal experience), which is twice as much oil. 
  • Therefore, you should not assume that 1 mL will be twice as strong in smell or therapeutic value compared to another brand – it often varies by brand and even batches within the same brand. 

To make matters worse, some diffusers are more efficient than others.

  • A general guideline to follow is 1 mL for every 40 Watts of power. This is a very rough estimate, but it gives you an idea of how much oil you should use. 

How many drops of essential oil in oz?

Essential Oils are highly concentrated liquids without any additives or chemicals. They are powerful, so you have to be careful when you use them. 

  • 1 oz of essential oil is equal to 28 grams. 
  • 5-6 drops of essential oil per ounce of carrier oil.

So, if you want the answer in drops, just divide the number of grams by 28 – it will give you the number of drops. 

However, there are some factors that affect this calculation:

– Essential oils are not water-soluble

– The viscosity of an essential oil varies from one type to another

Here is a simple example for someone who wants to know how many drops of essential oil they need to add into their 2 oz (60 ml) carrier oil: How much Roman Chamomile do I need in my carrier oil?

Roman Chamomile (Anthemis nobilis) essential oil has a density of 0.885 g/cm3 and its molecular weight is 256.24 g/mol. 

So, if you want to add 28 grams of Roman Chamomile essential oil into your 2 oz (60 ml) carrier oil, here are the calculations:

28 g ÷ 0.885 = 30.73 drops per gram

30.73 x 256.24 = 7734 drops total

7734 ÷ 60 ml = 127 drops per milliliter

If you want to find, out how many mL one drop of Roman Chamomile essential oil equals then just divide 1 by 7734 – that will give you 0.0013 which is equal to 1/76 of an mL.

As you can see, essential oils are highly concentrated liquids that have powerful effects on your body, mind, and spirit. 

So, be careful when using them!

Avoid using too much essential oil in a diffuser – Why does it matter?

Everyone wants to have one of these devices at their apartment or house so that their environment smells lovely and they can experience the benefits of aromatherapy even during busy days. 

This is not a bad idea by any means, but some people are using high amounts of essential oil in their diffuser without knowing just how sensitive certain pets are. 

So why does this matter? 

How can someone harm their pet with an essential oil diffuser? 

Here is what you need to know about specific types of oils and cats.

Cats Have Sensitive Senses Of Smell And Sense Of Taste

The reason why it matters does not lie within the fact that one cannot use an essential oil diffuser with pets. 

The reason why it matters is that these devices are used to emit high amounts of concentrated oils into the air, which means that you might not be aware of how much of the substance your feline friend breathes in on a daily basis. 

essential oil safe for cats

Cats have pretty sensitive senses of smell and taste, so they cannot withstand strong odors for very long without feeling some sort of discomfort or negative effects.

Secondly, even though you might mix up catnip oil with lavender oil at times (these two go well together), cats cannot metabolize certain types of essential oils naturally. 

That is why if someone uses too much lavender oil in their diffuser near their kitten, then there is a that the pet will feel woozy and dizzy. 

This may not be a life-threatening reaction, but it is one that you should keep in mind when installing any type of diffuser in your house.

Effects of Using Excess Essential Oil with Your Diffuser

The excess essential oil in the diffuser could result in one or more of these effects:

1. The room may smell like there is a problem with your diffuser itself. Some oils are just stronger than others and can overpower other scents in the room. 

You will ALWAYS want to put 1-2 drops at most peruse even if it means making multiple batches to keep your home smelling fresh all day long! 

If you find yourself needing more than 2 drops, then perhaps you need to switch out scents or if possible, use another diffuser in the same area without wasting your oils.

( It’s not really wasteful though because it doesn’t stay in the air for very long anyways when using good quality essential oil .)

2. The diffuser can become clogged – excess oils can cause some of the plastic pieces or wick to swell and stop working correctly.

If you notice that your diffuser is not misting as much, as usual, give it a good clean with water and vinegar before attempting to use it again. 

A build-up on the insides could be causing the unit to malfunction.

3. Not using distilled water can also cause problems!

I’ve had many customers who have used tap water only to find that their machines aren’t working properly anymore because of mineral deposits/hard water which can cause all kinds of issues including clogging your machine. 

If you’re unsure about what type of water your city provides, call them and ask them if it’s safe for human consumption.

(This is why it’s best to use distilled water when using any essential oil diffuser .)

4. The plastic piece in the bottom of your unit can warp if you’re adding too much oil into your diffuser. 

Once this happens, you won’t be able to remove the piece and fill it with water anymore so remember not to go overboard!

5. This may seem like common sense but I’ve seen it happen before… don’t overheat your oils or pure essential oils! 

Yes, they will last longer but at what cost?! They will lose their therapeutic properties quickly when heated for too long! 

And nobody wants a half-used bottle of undiluted peppermint because it burned a hole through the bottle!

If you’re using a cheap oil diffuser from eBay or Amazon, then don’t expect it to last very long – these are usually made from low-grade plastic that can easily melt and warp in high temperatures so try not to keep your unit on longer than 2 hours at a time.

 It’s a better idea to use a lower setting with more intermittent breaks instead of leaving it running all day long 

What to do if You Add Too Many Drops?

If you add too many essential oil drops to your diffuser, make sure to take it off and clean the area. 

If you don’t do this it is possible that the essential oil will not get into the air but stick to the walls of the diffuser or get on your furniture or carpet.

In some cases, these oils might cause problems with them because they could stick around for a long time. 

One way to clear out these scents from your home quickly is to go outside and let the breeze blow through all of the rooms. 

You might also try using a fan if you have one available near a window.

One thing that many people do when they add too much essential oil is used more water so it spreads it out.

This can be a good solution, but you have to use just the right amount of water so that the essential oil isn’t too diluted or not diluted enough. 

The recommended ratio is usually one drop per 10mL of water.

If your diffuser runs for a long time compared to the 10m being, there’s a chance that evaporated oil will get on furniture and other objects in your home. 

Some people add more drops if their mixture isn’t strong enough, but this can damage your diffuser or other things around it because they might stick around for a long time.

Another thing to remember about adding too many essential oil drops is you need to make sure you’re using pure oils any additives. 

Many manufacturers try to sell oils that have additives to make them stronger. If you add too much of these additives it can damage your diffuser and maybe even force you to get a new one because the surfaces might start bubbling and peeling off. 

It can also damage your furniture and other objects in your home, but these effects only happen if you add many drops at once without considering how much water is in your diffuser or what kind of essential oil you’re adding.

What will happen if you use fewer amounts of essential oils in your diffuser?

If you use fewer amounts of essential oils in your diffuser, it might not have a strong effect on the air around it. 

This is because there still remains a good amount of oil in the bottle. 

If you do not wish for this to happen, try using a smaller amount or switch to a different blend that has a better smell.

Can you use any essential oils in the diffuser?

The answer to that question is YES and NO. 

There are some oils that must be diluted when used in a diffuser, such as Lavender oil. It’s important to read the label of essential oils before use in any type of diffusion, including atomizers and ultrasonic diffusers. 

Essential oil labels usually state if it can be used undiluted or if dilution is required — but even with the fine print, we recommend consulting with your Aromahead Institute Mentor (AIM) for guidance on essential oil safety because everybody responds differently. 

We also want you to feel confident about your aromatherapy practice, so here’s our best advice: Many people enjoy using undiluted essential oils in their diffusers; however

How often do you put oil in a diffuser?

You can put oil in a diffuser as often as you like, however, we recommend changing the oil every 2 weeks (or more often if you have a big family and/or use it often). 

It depends on how much you use your diffuser. The duration of one bottle should be about 2 months.

Every type of oil has its own shelf life: generally speaking – anything from 3 months to 1 year. 

However, even though after this time the aroma strength will decrease, it still won’t be harmful to your health. 

If you notice that your essential oils start to form crystals or changes color – these are clear signs of degradation. If your oil starts to show any of these signs – it’s time to get a new one.

We put essential oils in clear glass bottles with droppers because what you see is exactly the amount you get, compared to opaque bottles that have no way of telling how much content is left inside.

Also, don’t forget that even though the bottle has a dropper attached – it doesn’t mean that there should be this much liquid inside. Overfilling will cause pressure and ruin the dropper! Keep contents under the “Max” line on each bottle cap.

How many drops are needed for 1 hour diffuser session?

For a 1-hour diffuser session, 6-8 drops are enough. However, if you’re using a big diffuser – add more!

How long can a 100ml oil diffuser stay on until it runs out?

If you follow the instructions and fill it with approximately 100 ml of water and add some drops of oil, it should last for about 4 hours before needing a refill. 

But if you use more oils or less water and/or leave it on overnight, then expect that number to decrease accordingly. 

The best way is to experiment and see what works for you! 🙂


How many drops of essential oil per 100ml diffuser?

100 ml diffuser needs 4 drops of essential oil.

How many drops of essential oil are in a 150ml diffuser?

150 ml diffuser needs 6 drops of essential oil.

How many drops of essential oil are in a 200ml diffuser?

200 ml diffuser needs 8 drops of essential oil.

How many drops of essential oil are in a 250 ml diffuser?

250 ml diffuser needs 10 drops of essential oil.

How many drops of essential oil are in 400ml diffuser?

400 ml diffuser needs 16 drops of essential oil.

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