Dilute Essential Oils Safely, Down to the Drop
Find exactly how many drops to add to your carrier oil for a safe dilution.
This tool was built by Serge, MSc., a plant biologist and environmental scientist with a BSc in Plant Biology and an MSc in Environmental Biology and Biogeochemistry. My research focused on how climate warming affects soil carbon cycling in boreal forest ecosystems. These tools are for educational purposes and give practical guidance, not professional advice.
Essential oils are concentrated plant chemistry, and almost every case of irritation comes from using them too strong rather than too weak. Diluting them in a carrier oil spreads them safely across the skin and makes them last. Enter how much carrier oil you are using and the dilution you want, and this tool gives you the number of drops to add, based on the standard that twenty drops make roughly one millilitre.
Please enter a carrier oil amount above zero and choose a dilution strength.
How this works
A dilution percentage is the share of the finished blend that is essential oil, so a two per cent blend is two parts essential oil to ninety-eight parts carrier. The tool converts your carrier amount to millilitres, takes that percentage of it, and converts the result to drops using the widely used figure of twenty drops per millilitre. Drop size varies between oils and droppers, so count carefully and treat the number as a close guide rather than an exact measure.
Choosing a strength
Lower is safer, and you can always add a drop, never take one back. Half to one per cent suits the face, children over the relevant age, and sensitive or older skin. Two per cent is the everyday strength for general body blends and massage on healthy adult skin. Three per cent and above is for a specific area and a short spell, such as easing a sore muscle, not for daily all-over use. Stay at the low end when in any doubt.
Important safety note
This tool helps with dilution maths only; it does not tell you which oil is safe for your situation. Some oils are unsuitable during pregnancy, for children, for pets, or alongside certain medications, and some, especially citrus, raise the skin's sensitivity to sunlight. Always check the specific oil against a reputable safety source and seek professional advice for medical use. These blends are for topical, personal use and are not a treatment for any condition.
Scientific basis
Dilution guidelines and drop-to-millilitre convention, Tisserand Institute: tisserandinstitute.org. Safe dilution ratios, National Association for Holistic Aromatherapy (NAHA): naha.org.
Explore my other free tools
Blend a balanced cup with the Herbal Tea Blend Ratio Calculator, get the firmness right on a salve with the Salve & Balm Ratio Calculator, and swap herb measures with the Dried-to-Fresh Herb Converter.
Disclaimer: This calculator gives general educational guidance on dilution only. It is not medical or aromatherapy advice, and essential oils should be used with care and professional guidance where appropriate.
