Assuming that's a 5" grinder with a 13 amp motor it'll be making roughly ~2ish hp. About the same as a small homeowner saw and about the same rpm (11-12,000)
@ironman_gq you have some powerfull grinders then. I also thought it was a 5" grinder.
They are about 850W (not even 4A) or about 1 HP in europe.
It's the 10" grinders that make a significant amount of power 2000W. In Dutch they are called Demons. But even with 2000W I do not want to mill.