So I accidentally bought the wrong nicotine. In the past I have used Nicotine River’s 48mg PurNic E-Nicotene. This time I must have spaced out because I bought their Bulk PurNic Nicotene 3mg.

I usually vape at 6mg. I’m wondering if anyone can give me a formula for adding the 48mg to the 3mg to reach 6mg.

You can put the two together:
Theory:
x ml Nicotine 3mg/ml = y
x’ ml Nicotine 48mg/ml = y’
x + x’ = total ml.
y + y’ = total mg of Nicotine
Total Nicotine / total ml = strength of the nicotine obtained

Example:
50 ml Nicotine x 3mg/ml = 150 mg
50 ml Nicotine x 48mg/ml = 2400 mg
50ml + 50ml = 100ml
150mg + 2400mg = 2550mg

The calculator isn’t inaccurate - my example was. You are correct 7.14 mls of 48mg/ml will get you to 6mg/ml dilution with an addition of 100mls of 3mg/ml nic. The calculator works fine:

No harm no foul - I was just trying to be of assistance. They may not want to mix 107.14mls of base either, but they can find a solution to the question with the calculator.