For every ounce of liquid product, there are 591 "drops". This is an important conversion to know when working with small batches. We receive many questions on how to translate "by %" with "drops". For example, many of our customers are interested in the right amount of preservative they need for their batch. If you're making a pressed eye shadow, we recommend that you directly put the preservative in your liquid binder (whether it's the TKB MyMix Press Medium or jojoba oil). That means if you have 1/2 fl oz bottle of binder you'll only need 1-2 drops of preservative.
You can easily search through Google as well "how many drops in [x]" or "how much is [x]% of [x]" to calculate these forms of conversions as well.