I'm sure there are many techniques out there to measure your desired nicotine concentration but just one of the methods I use to get my final concentration in my e-juice:
c1v1 = c2v2 where:
c1= initial concentration (Nicotine you bought)
v1= initial volume (amount of nic you going to add, also known as your unknown)
c2= final concentration (the concentration you want your juice to be)
v2= final volume (amount of juice you preparing)
Example:
If i have a bottle of 36mg/ml nicotine purchased from the shop.
And i wanna make 100ml of my own e-juice.
And i want my juice to have 3mg nicotine strength.
Then:
c1v1=c2v2
36 x (unknown) = 3 x (100ml)
unknown = 3mg x 100ml / 36mg
unknown = 300 / 36
unknown = 8.33
therefore you will throw in 8.33ml of your 36mg/ml nicotine to 91.67ml to give you a final volume of 100ml juice 3mg/ml nicotine concentration.
c1v1 = c2v2 where:
c1= initial concentration (Nicotine you bought)
v1= initial volume (amount of nic you going to add, also known as your unknown)
c2= final concentration (the concentration you want your juice to be)
v2= final volume (amount of juice you preparing)
Example:
If i have a bottle of 36mg/ml nicotine purchased from the shop.
And i wanna make 100ml of my own e-juice.
And i want my juice to have 3mg nicotine strength.
Then:
c1v1=c2v2
36 x (unknown) = 3 x (100ml)
unknown = 3mg x 100ml / 36mg
unknown = 300 / 36
unknown = 8.33
therefore you will throw in 8.33ml of your 36mg/ml nicotine to 91.67ml to give you a final volume of 100ml juice 3mg/ml nicotine concentration.