Seriously, nic calculator. I'm not even gonna try and do the math, you are getting enough and varied answers. One of them may well be correct.
As far as I'm concerned, calculators were the best invention since the abacus.
Nic calculators are the best invention since calculators.
Really, you want/need to learn to do it yourself, it's a great feeling and I am only semi sarcastic about that.
Do your calc on a eliquid calculator and then come back and verify your work if you are at all concerned (and you should be, etc.)
Good luck. Even I can use them, and I find math to be not just a challenge, but something I often like to pretend doesn't exist (you are going to get varying results on that approach to life, however.)
Anna