Teach Soap

hi, all my orders got here this week yippee (except for packing supplies)
I got the suction droppers from BB. I made up some body butter already before they came using 1/8 tsp. A couple use 2 which is about 1.26ml and the rest were good at 3 which is 1.89ml (This was for 5 ounces of product) My question is this..how do I find these on the dropper? They look like they go in perfect increments .50ml,1ml,1.50ml,2ml,2.50ml and 3ml. I want to use the droppers instead of tsps. but all of my percentages are an "off number".
I'm finding it even harder to be able to test 1 ounce of product which will be 0.074 ml - 0.88ml at .25% to 3%
I did kinda counted the drops from the bottle (they were 3.3 ounce bottles of FO from somewhere else with a dropper type top included into the bottle.) It was about 9 - 10 drops per 1/8tsp. But I want to use the droppers! lol
How do you all use them for "weird" numbers?

I use droppers to get my fragrance out of the bottle and then measure them on a scale to get the right amount. That usually helps make it more accurate.