For 10ml of juice, lets just say you want 50/50 @ 12mg. You have 100% VG juice @ 48mg/ml
You would do -
Plain VG = 2.5ml
Plain PG = 5ml
48mg Nicotine in VG = 2.5ml (this makes our final solution 12mg/ml, because you're using 2.5ml of 48mg/ml nicotine in 10ml of juice - which is a quarter of the 10ml. 48mg divide by 4 gives us 12mg/ml)
This would give you 10ml of 12mg e-juice @ 50% VG/50% PG. Success!
Have no idea if that helps or not
Lets say you want 10ml of juice at 80% PG/20% VG @ 12mg (using the same 100% VG 48mg of nicotine per ml)
You would do -
Plain PG - 8ml
48mg/ml nicotine in VG - 2.5ml
But uh oh...8ml + 2.5ml? 10.5ml! We only wanted 10ml at 12mg with 80/20 ratio. You can't do 80PG/20VG @ 12mg using nicotine that's 100% VG @48mg
Your nicotine (also called nicotine 'base') does make a difference in the final percentages of PG/VG...because in the first example I used 2.5ml of it...2.5ml of nicotine base in 100% VG counts as 2.5ml of VG.
I hope I haven't confused you more!
I suggest using a ejuice calculator -
http://www.e-cigarette-forum.com/fo...e-calculator-added-quantity-calculations.html
Remember that when people say 48mg nicotine, they almost always mean 48mg per ml when talking DIY. That's how we buy our nic, it's per millilitre.