Woof, too much math.

I'm at the point where I'm mixing almost every color. There's an app (iModel) that has every paint maker's color charts, conversion charts and a really cool mixing calculator that lets you program what you have on hand and it'll give you formulas, including all Fed, RLM and RAL shades.

All that said, I just go by drops: If the formula is 7:5:2, I just multiply that by my needs, generally 14,10 and 4 drops into a new eyedropper bottle, add the same amount of thinner, close it up and into the shaker.

Trying to pour to a fixed amount like 10ml would end up in a disaster on my bench. The ratio counts, not the end amount.