I make no claim to being a Nicotine Juice mixing guru, I just use Todd Muller's "eJuice Calculator" to work out what measurements are needed to correctly mix my eJuice. The Images below are for 100mg/ml raw, unflavoured PG nicotine (100%)
VG = Vegetable Glycerin
PG = Propylene Glycol
HiLiq Nicotine suppliers, this link goes to the HiLiq page that has 100mg-200mg strength Nicotine.
Nicotine Base: 100mg/ml
Target Nicotine Level (strength): 12mg/ml
Amount to create: 90ml
Water Added (optional): 0%
Flavour Percent: 5%
PG or VG vith Nicotine = 10.8ml - 12%
PG or VG (no nicotine) = 74.7ml - 83.0%
Water = 0.0ml - 0.0%
Flavourings = 4.5ml - 5.0%