Talk:Ninja Tabi/@comment-5319740-20140312012719/@comment-24053145-20140626130258

Multiplicitively.

A crit will do 162% of the attacker's AD (pre armor) and a non-crit will deal 90% of the attacker's AD (Pre armor)

In other words, a crit does 180% the damage of a normal attack, the same as if you hadn't bought tabi.