400 CRATE = 26% Crit Chance
Damage Formula:
Damage = Skill Factor*AttackA*log10((AttackB/Defence+1)^0.9+1)+Additional Damage
AttackA:
AttackA = 1.5*PATK+CATK
AttackA is the only part that includes Crit Damage which means that Crit Damage does less overall damage than it appears due to it not being used in the log function, however, Crit Damage is still used in Skill Factor. But to give you a simplified number not including the log portion, you’re looking at:
1400*0.26 = 364 Average CATK
(Assuming you meant CATK when you said Crit Damage as this does not include the additional 50% Crit Modifier though it would be the same for total Crit Damage but I doubt that’s what you meant.)
Basically 364 more Attack.