Essential Oil Conversions - Ounces to Milliliters to Drops

Here are a few tips to keep in mind when it comes to converting ounces to milliliters to drops and diluting essential oils with ease.

Conversions:

1/8 oz. = 3.75 ml.          1/4 oz. = 7.5 ml.
1/2 oz. = 15 ml.             1 oz. = 30 ml.
         4 oz. = 120 ml.          8 oz. = 237 ml.          16 oz. = 473 ml.

Technically, there are 29.57 ml. in 1 oz., however, this is usually rounded up to 30 ml. on labels and in recipes. This gives you a nice whole number to work with and less agonizing over decimals.

There are around 20 drops of essential oil in 1 ml. This works out to be…

1/8 oz. = 75 drops          1/4 oz. = 150 drops
1/2 oz. = 300 drops          1 oz. = 600 drops

These drop conversions will help you increase any 10 drop blend to the appropriate size that you need.

Dilutions:

Essential Oils are very strong and must be diluted (usually in a carrier oil) or incorporated into a finished product such as a massage oil, lotion, or aroma spray. Whether diluting an essential oil or adding it to a finished product, the oil content should only account for 1 to 2% of the total blend. Here is the break down of how much essential oil to add to 1 oz. of carrier oil or to a finished product. These dilutions for 1 oz. can easily be multiplied for larger batches of finished product or divided for a fraction of an ounce.

We are going to use our conversions from above!

1% dilution: 1 oz. = 30 ml. = 600 drops of oil. 1% of 600 drops is 6, so………. for 1 oz. of carrier oil or finished product you are going to add 6 drops of essential oil.

2% dilution: 1 oz. = 30 ml. = 600 drops of oil. 2% of 600 drops is 12, so………. for 1 oz. of carrier oil or finished product you are going to add 12 drops of essential oil.

This information comes from Mountain Rose Herbs