Conversion Guide - How many drops are in your bottle of essential oil? There are different units of measurement to convert from drops to ounces to milliliters.  Here are a few tips to keep in mind when it comes to converting: 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.  There are approximately 20 drops of essential oil in 1 ml., or  1/8 oz. = 75 drops, 1/4 oz. = 150 drops, 1/2 oz. = 300 drops, 1 oz. = 600 drops Diy, Essential Oil Blends, Young Living Oils, Essential Oils, Perfume, Diluting Essential Oils, Essential Oils Health, Essential Oil Remedy, Herbal Oil