I want to make a DIY e-liquid calculator and I really need some help. So... you want to make for example 15ml of juice 30/70(VG/PG) with 18mg/ml nicotine strength. You have 10/90(VG/PG) base with 27mg/ml nicotine strength. You have to add 6,67ml nicotine base + 2,3ml VG 0 nic + 1,04 PG 0 nic. I have found the formula for that nicotine base (nic.base=nic.final*100/(nic.initial*100/batch size), where batch size in our example was 15), but I can't find the formulas for VG and PG 0 nic. Can anyone help me, please ?