Does your calculator let you put in what you paid for the various ingrediants so you know what your eliquid costs per ml?
My starting order was from myfreedomsmokes and was $100. That got me 1 liter of 100mg nic (which should last me 3-4 years), 1 liter each of PG and VG (about a year supply for me), some miscelaneous mixing supplies, and one flavor. I've been vaping on that single flavor for several months, (I didn't smoke 10 flavors of cigarettes.) So my cost is about 2 cents per ml x 6 ml per day = 12 cents x 365 = $45 a year more or less. I like my simple mix better than any pre mix I've tried and I like that there are no sweetners so my coils last a week+ instead of a couple of days.
GIven the government pursuing us like we are tax cheats everybody should put some nic in the freezer even if you're not ready to mix. I put it off for months. I didn't need to. I mix 210 ml batches in about 15 minutes.