What is the calcution for grades in Ranked Matches and leaderboard Q

I’m just a little curious about the grades in the ranking system. Is it calculated through PP and BP points together or is there a certain amount that points in general that you need that will change your grade?

Also at how many points will you start appearing on the leader boards? I’m currently at a measly 1800 BP while my with Ibuki at 3500 PP(C+), Viper at 2300 PP© and Juri at 1800 PP

you have it backwards. PP is player points. BP is battle points.

Whoops, PP/Player Points are overall points right?
I always get those confused but hey, the more I’m reminded, the better I will remember.