| Akerlof |
No there is a different formula. A x2 damage critting does x3 damage. A lance with spirited charge is x5 I think. There is a section on critical multiplication but I forget where it is.
It's in the Combat chapter, Damage section:
Multiplying Damage: Sometimes you multiply damage by some factor, such as on a critical hit. Roll the damage (with all modifiers) multiple times and total the results.Note: When you multiply damage more than once, each multiplier works off the original, unmultiplied damage. So if you are asked to double the damage twice, the end result is three times the normal damage.
Exception: Extra damage dice over and above a weapon's normal damage are never multiplied.
Italics mine.
So, multiple multiplications are additive, not multiplicative. ^.^ Break the damage down into a base component and a bonus component, and the base component doesn't stack: A lance has a x3 crit modifier (base damage + x2 bonus damage), you are Spirited Charging for x2 damage (base damage + x1 bonus Damage). When you crit, you do base damage + crit bonus damage + Spirited Charge bonus damage = 1 + 2 + 1 = x4 total damage.