How is spell experience calculated?

[Oermtuhz]

Looking in xEdit and confirming in CK, the Actor Value records for each skill have a "Skill Use Mult" that may be interesting

Alteration is 3.00

Conjuration is 2.10

Destruction is 1.35

Illusion is 4.60

Restoration is 2.00

 

Some other notable skills are Enchanting at 900.00, Alchemy at 0.75, and Light/Heavy Armor at 4.00 and 3.80, respectively. I also know that Calculations are done with Floats, then are rounded at various points (that's how the UI can show you having the Magicka to cast a spell but you still can't cast it because you don't have enough Magicka).