For mg of nicotine: (mg of nic/ml × ml of nicshot) ÷ (ml of ejuice + ml of nicshot) Ex: using 2 nicshots of 20mg/ml and 50ml of ejuice (20mg/ml × 20 ml) ÷ (50+20) = 400mg ÷ 70 = 5.7mg/ml
For percentage of flavor (ml of ejuice + ml of flavor ) ÷ 100 = 1% 1% × percenage of flavor you want Ex: using 2 10ml bottles of flavor (15%) and 80 ml of ejuice (80 + 20) % 100 = 1 ×15 = 15 In this case use only 15ml of flavor instead of 20ml This one involves some guesswork and you need to find the perfect balance (i like a little bit more flavour so id use 16ml or 17ml in this case.)
Hope this helps any beginners!
Forgive the question if, indeed, forgiveness is required but I've been for many years and I haven't the the slightest notion WTH a 20mg " nicshot " might be. As did many noobs, I started with drops, then syringes, then to measuring by weight and I'm not saying I didn't do a couple of shots along the way (some days, more than a couple [c'mon ... we've all been there]) but this is new to me.
Due to TPD and tax laws, Europe sells nicotine at the max allowable strength in one bottle, known as 'nic shots'. The vg/pg/flavors come in a separate bottle called 'short fills'. It has a little extra empty room for the nicotine. The end user mixes them together at their desired strength. This lets the end user avoid some onerous taxation for the rest of the e-liquid.