you don't need a calculator the math is pretty simple.
10% by volume for total flavoring by volume is about middle of the road and a good place to start with most flavors. so if its a 10 mL batch use 1 mL of flavoring total..
nicotine is a bit more complex. so lets say we are making a 10 mL batch of 12 MG per mL fluild. and the base nicotine is 72 MG per mL.
so 1.7 Ml of base multiplied by 72 MG = 122.4 total milligrams of nicotine now divide 122.4 by the number of total mL in the batch in this case its a 10 mL batch you end up with 12.24 MG per mL.
be extremely careful with all
e-liquid especially your base nicotine.
i always use rubber gloves when dealing high strength (over 24 MG per mL) liquid
base nicotine MG per mL (72) multiplied by total number of mL used (1.7) divided by total number of mL in the batch (10) = final MG pre mL concentration (12.24)