You can use the www.gridcoinstats.eu website and they figure that out for you! Additionally www.gridcoin.network there are a few recently added websites since Gridcoin is an open-source open-community project and there is no real official website BUT www.gridcoin.us along with www.gridcoin.science have a bunch of guides. The numbers are not static so its always changing. So just look up your cpid/username and at either those first 2 sites ( block explores ). I hope that helps.
P.S. you do not mine Gridcoin its not something you are searching for or helping build you earn Gridcoin by processing work units from Gridcoin Whitelisted projects. I agree about the guides on Gridcoin and maybe read threw cryptocoin talk , youtube etc along with joining the irc community @ irc.freenode.org #gridcoin and/or join the Gridcoin slack channel.