A good starting point is to use 3-5 drops per 100 ml of water for ultrasonic diffusers, adjusting based on room size and personal preference.

The number of drops of essential oil you should put in a diffuser depends on several factors, including the type of diffuser, the size of the room, and your personal preference for scent intensity. However, here are some general guidelines to help you determine the right amount: 

Diffuser Type: 

• Ultrasonic Diffusers: For ultrasonic diffusers, which are the most common type, the standard recommendation is 3-5 drops of essential oil per 100 ml of water. This ratio ensures a balanced scent that isn’t overpowering. 

• Nebulizing Diffusers: Nebulizing diffusers don’t require water and use pure essential oil. Typically, 10-15 drops are enough to produce a strong aroma, but this can vary based on the size and power of the diffuser. 

Room Size: 

• Small Rooms (up to 150 square feet): 3-5 drops of essential oil should be sufficient for a small room. 

• Medium Rooms (150-300 square feet): 5-10 drops are generally recommended. 

• Large Rooms (300+ square feet): For larger spaces, you may need 10-15 drops, depending on how strong you want the scent to be. 

Personal Preference: 

• If you prefer a subtle scent, start with fewer drops and gradually add more until you reach your desired fragrance level. 

• For a stronger aroma, especially if you’re diffusing for therapeutic purposes like respiratory support, you can add a few more drops. 

Oil Potency:

• Some essential oils are more potent than others. Oils like peppermint, eucalyptus, and clove are strong and may require fewer drops, while lighter oils like lavender or chamomile might need a bit more. 

A good starting point is to use 3-5 drops per 100 ml of water for ultrasonic essential oil diffusers, adjusting based on room size and personal preference. It’s always better to start with fewer drops and add more as needed to avoid overwhelming your senses. 

 Author: Coralee Roberts

Coralee is a passionate health and wellness advocate with a deep understanding of holistic living. Driven by a desire to empower herself and others to achieve optimal health and well-being. Becoming a qualified Naturopath in 2015 and continuing her aromatherapy studies since. Through her writing and teachings, Coralee aims to inspire and support others on their own paths towards wellness and resilience.