E juice mixing nicotine

[marine]

If I'm using 100mg/ml nicotine base how many ml of nicotine do I use to make 150ml of juice at 3mg strength .. the online calculators say 7.5 although nude nicotine states 4.2 .... i have never made my own juice so I'm confused a little .. can someone clarify this for me ?

 

[Strangebrew]

150/(100/3)=4.5 ml.

 

[bwh79]

150ml, at 3mg per means you want 450 milligrams nicotine in the bottle. 450 milligrams, at 100 per, is 4.5ml of nic base.