Help with calculation

[MrSmith99]

I am looking at Coffee Flavor (Clear) at Perfumes Apprentice and they say use 5% or less of Coffee Flavor:
Perfumers Apprentice - Coffee Flavor Extra (clear)

If I have 30 ml of juice already mixed unflavored (24mg nic, 75/25 pg/vg), what is 5% in drops?
My calculation was 20 drops, but that seems like way too much. Is there an online calculator for this kind of stuff?

Incidentally, if I seem like such a newb to mixing I kinda am. I just cheat by buying unflavored premixed in bulk and then add a few drops of flavor myself. I don't want to mess with mixing nic.

 

[Buggs5347]

Just and FYI - There is a DIY forum you really should use for questions about making your own juice.

5% of 30 mL is 1.5 mL Depending on how big your drops are the number of drops to make up 1.5 mL could vary. But, generally, there are 20 drops to 1 mL, so 30 drops should be 5%.

Yes, there are several mixing calculators available. You'll be able to find them via the stickies and posts in the DIY forum. Or, some of the DIY suppliers have calculators on their website you can use, as I recall.