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Essential Oil Conversions & Dilutions Guide (with Calculators!)

Bottles of essential oils and fresh herbs on a fresh colored linen cloth placed on a grey stone slab.

Working with essential oils can be exciting, inspiring, and confusing, all at the same time. There's a good bit of non-intuitive math involved. We purchase in ounces or portions of, blend in percentages and parts, and measure in ounces, drops, or teaspoons. How do you keep track of it all, or know how much oil to use?

Measuring and Diluting Essential Oils

Following and formulating recipes with essential oils can be tricky. When crafting aromatherapy or body care creations for personal use, the potent nature of essential oils often means that only tiny volumes are needed, so it makes sense to measure amounts in drops. However, for those looking to make larger batches to give away or sell, counting out several hundred drops of liquid is simply not practical (drops are also not very reliable on a larger scale; see conversion Pro Tips below). If you've ever wondered how to convert drops into standardized units like milliliters, teaspoons, and ounces, you aren't alone!

Additionally, essential oils are very strong and must be diluted for safe use, either on their own (usually in a carrier oil) or by incorporating them into a finished product such as a massage oil, lotion, or aroma spray. Whichever dilution method you choose, the essential oil content should only account for 0.5% to 2% of the total blend. This equates to 3 to 12 drops per ounce of finished product. For easier versions of all this math, check out our handy charts and calculators below!

Essential Oil Conversion Chart & Tips

Info-graphic of essential oil measurement conversion chart

Pro Tips

  • There are technically 29.57 mL in one fluid ounce. When working in recipes with total volumes up to four ounces, we tend to round this number to 30 mL (beyond this scale, those missing 0.43 mL start to add up and impact your results).
  • Use a measuring tool that makes sense, opting for drops when needed and teaspoons when appropriate.
  • There are approximately 20 drops in 1 mL.
  • These measurements should be considered estimates. Not all essential oil drops are equal; differences in viscosity will impact the volume of an oil that holds together in a drop.

Essential Oil Conversion Calculator



Essential Oil Dilution Chart & Tips

Info-graphic of essential oil dilution chart.


  • Use a measuring tool that makes sense: drops when needed and teaspoons or ounces when appropriate.
  • There are approximately 20 drops in 1 mL.
  • These measurements should be considered estimates. Not all essential oil drops are equal. 

Essential Oil Dilution Calculator



Want to Create Your Own Natural fragrance blends?

Check Out Our Essential Oil Blending Tips

You may also be interested in: 

Pin to Guide to Diluting Essential Oils  

This blog was originally published in 2013. Because it's so popular, we decided to update it for you. Enjoy!  

Topics: Aromatherapy, Natural Body Care


Written by Christine on December 5, 2018

As Products Manager, Christine Rice has been working with the botanical goodies at Mountain Rose Herbs for over 14 years. With a Certificate in Aromatherapy from The American College of Healthcare Sciences, she works closely with the essential oils and hydrosols that we offer. She connects with the aromatherapy industry through our National Association of Holistic Aromatherapy business membership and contributes on working committees with The American Herbal Products Association. In addition to her love for aromatics and blending essential oils, Christine can be found gardening and exploring the beautiful Pacific Northwest. She enjoys canning and preserving food, knitting when she has time, and keeps busy with her energetic daughter.