If you have an ultrasonic diffuser, you may find yourself wondering how much essential oil to add to diffuser. After all, you don’t want to add too much to your diffuser and overwhelm yourself. You also don’t want to add too little and not have enough scent permeate the air.

I know it took a little trial and error on my part before I found the perfect balance, and I wanted to share my findings with you. This way, you can use this guide with your own ultrasonic diffuser. You’ll be able to enjoy your diffuser and favorite essential oils sooner, and this is great news.

Why is it Important Not to Use Too Much Essential Oil in a Diffuser?

There are several reasons why you wouldn’t want to add too much essential oil to your diffuser. First, the fragrance from the essential oils can be very overwhelming, especially in smaller spaces. Some essential oils have strong scents in the first place, and they get stronger when you add too much to your diffuser and switch it on.

This exposure to the stronger essential oil smells can actually cause a few problems for the people who breathe them in. The problems can get worse if the person has sensitivities or allergies to the oil’s fragrance itself. Some of the most common symptoms include:

  • Dizziness
  • Eye Irritation
  • Giddiness
  • Headaches or Migraines
  • Respiratory Tract Irritation
  • Nausea
  • Vomiting

What to do if You Add Too Many Drops

Once you switch your diffuser on, it won’t take too long to realize that you’ve added too many drops of essential oils. You’ll start tasting it, and you could get a headache. However, you can fix it relatively easy. You may believe that you have to leave your house until the overwhelming scent goes away and the diffuser empties itself. This isn’t the case, and it’s a good thing too because it could take up to 12 hours if you have a larger diffuser.

To help cut the scent, you want to empty the reservoir into another jar. You can split this up between two uses. Now you’re free to dilute the mixture with more water. Add the water back into your reservoir. You may want to wait a few hours to switch it on again if it’s still a strong scent.

How Many Drops of Essential Oil in Diffuser?

When it comes to any essential oil diffuser; less is always more. They’re very concentrated, and this means that they have strong scents. A good rule of thumb is to start out with a few drops and work your way up. Your goal is to get a light and lasting scent instead of a dousing.

Most ultrasonic diffusers hold 100mL of water. Ideally, most people recommend between three and five drops of essential oil for every 100mL of water. Also, your amount will depend on the size of your diffuser and where you have it in your home. You can get different size diffusers, but most of them go up by 100mL. This makes it relatively easy to adjust your essential oil amount. They start at three to give and go up to 10 to 20 drops for the larger ones.

Diffuser Size Number of Drops
100mL 3 to 5
200mL 6 to 10
300mL 9 to 12
400mL 12 to 15
500mL 15 to 20

How Many Drops of Essential Oil in a 100mL Diffuser?

We mentioned that a 100mL essential oil diffuser is the industry standard. Normally, you’d only need between three and five drops of essential oils for this size diffuser. It’s best to start on the low end and work your way up to five.

This is your guideline amount, and you can add or take away oil as needed. For example, you’d most likely use less oil for a smaller or less ventilated room. Your oil’s strength will also play a factor. Some essential oils have stronger scent profiles than others.

Tips on How to Use Essential Oil with a Diffuser

Clean Your Essential Oil Diffuser

You want to keep your essential oil diffuser running at peak performance. To ensure this, it has to stay clean. This is especially important if you routinely use several different essential oils. The oil residue can mix together and create an unpleasant scent.

You want to make a point to take your essential oil diffuser apart and clean it after each use. Not only will this get rid of the oil residue, but it’ll clean away any hard water buildup that can negatively impact how well your diffuser works.

Diffusing on an Intermittent Cycle

Your first instinct may be to diffuse continuously. However, this isn’t good for your diffuser or yourself. If you continually run your diffuser, your nervous system acclimates to it much quicker. This means that any benefits you could get from the essential oils don’t increase. (1)

Ideally, you want to diffuse for 30 to 60 minutes before shutting it off for 30 to 60 minutes. This intermittent cycling allows you to increase the benefits that you want to get from your essential oil. It’s also recommended to breathe fresh air between cycles. (2)

Consider the Location

The number of drops of essential oil you put into your diffuser relates to the size of the room you have the diffuser running in. Although the guidelines of three to five drops of essential oils for every 100mL is still a good rule of thumb, you’ll most likely go on the heavy side for a bigger area.

If you have a larger 300mL ultrasonic diffuser, you’ll put in at about 150mL of water. This means you want 10 drops of oil. A 500mL diffuser will use 15 or 20 drops or more to spread throughout a room. Another point to consider is your ventilation. You want a very well-ventilated room for your diffuser. This will help prevent the oil scent from building up and overwhelming you. You can try to open a few windows or run fans if you don’t have good ventilation.

Using Diffuser Around Kids or Sensitive People

Can you diffuse essential oils around babies or people with sensitivities? The answer is yes, and no. You don’t want to run a diffuser around your baby, especially a baby under three months old. The oils may be too strong for your baby to handle because their organs aren’t fully developed, and they’re much smaller than we are. It’s easy to overwhelm them with essential oils.

Another situation where you want to be very careful with diffusing essential oils is around people with sensitives. If it’s sensitivity, you may have to cut back to only a drop or two of essential oils. In a 100mL diffuser, you’ll only put in a drop or two at the most instead of three to five. This allows everyone to enjoy the scents without causing irritation or sneezing.

If You Have Asthma or Allergies

Inhalation is a safe way to use essential oils, but you do want to exercise caution if you have asthma or allergies. The smell of the essential oils could set off a reaction or irritate your respiratory tract. Most people can safely diffuse lemon, lavender, fir, cedarwood, grapefruit, tangerine, and spearmint without a problem.

However, there is a popular group of essential oils that you want to exercise caution with because they’re irritants for your mucus membranes. You should consider avoiding bay, cinnamon leaf or bark, clove leaf or bud, peppermint, lemongrass, and thyme.

Quality of the Essential Oil

It’s important that you purchase your essential oils from reputable brands. This is so important because the FDA doesn’t test essential oils for safety or how well they work before they go to the consumers. Essential oils that are impure increase your chances of having a negative reaction. This is why you should always buy authentic, pure, and genuine essential oils from trusted sources.

Diffusing Essential Oils Around Pets

As a general rule, pets are more sensitive to essential oils. You want to monitor your pets when you first start diffusing new oils. If you notice that they act different, remove them from the area and stop diffusing the particular scent.

Must-Try Essential Oil Diffuser Blend Recipes

Are you curious about creating different essential oil blends? We have several exclusive recipes that you can try in your own home. Whether you want to relax or get rejuvenated, our blend recipes can help. You can click here to find out more.

Bottom Line

Now you know roughly how much essential oils to put in your ultrasonic essential oil diffuser; you can use these guidelines for your own diffuser. We also touched on how to get the most out of your essential oil diffuser each time you use it, as well as how to safely diffuse around people with sensitives and allergies. You can take all of this information and put it to use to improve how you use your ultrasonic diffuser.