Do you know how to do math? Probably not so I'll help you.

Check nanopool stats for one of my mining rigs.
https://ibb.co/cgNt2G

Worker "x" is Claymore fees

Total shares = 56976 + 3460 = 60436

Percentage of fees from the total shares
(3460*100) / 60436 = 5.7% in fees