Damage Formulas

Physical
{[A(B) + C] - [D(E)2] +/- (A + D)}(FH)
G

A = Character's level
B = Attacking character's Str
C = Additional damage (applies to skills only) If there is no additional damage, C = 0
D = Target creature's level
E = Target creature's Def
F = If the attack element is super effective, F = 2. In all other cases, F = 1
H = If the attack is a critical hit, H = 2. In all other cases, H = 1
G = If the attack element is weak, G = 2. In all other cases, G = 1

If result is negative, damage output is 0.

Spell
((2A/5 2)*B*C)/D)/50) 2)*X)*Y)*Z)10/255

A = Attacker's Level (If attack is critical hit, A is doubled)
B = Attacker's Int
C = Spell Power
D = Defending character's Int
X = Same-Element attack bonus (1 or 1.5) If the spell type matches your property, X = 1.5. If it doesn't, X = 1.
Y = If spell type is super effective, Y = 2.
If spell type is not effective, Y = 1/2.
If spell type is neutral, Y = 1.
Z = A random number between 217 and 255

If result is negative, damage output is 0.