Hi there!
I know there are some tables out there, and even some calculators, but I built one with excel which takes all the variables I could think of a couple of minutes ago
These are: Fire Lances, Fire Bolts, Farenheit, Fire quanta pool, and fire quanta generation. They all add to the final damage.
PS: I'm sorry if this post doesn't belong here; I thought it fitted :S
Edit: Fixed a minor error (where I rounded up weapon damage) and added the upgraded Farenheit (1/0)