Instead of counting your edits 500 at a time in your contributions list, you could look up your grand total on your Preferences page. Your number of edits is listed under "Basic information", near the top of the page.

To get more details about your edits, try X!Tools's Edit Counter, which tallies up all your edits of each area of Wikipedia, and displays the totals for each and the grand total. It also shows the number of unique pages edited, the average edits per page, number of edits still active, and how many edits have been deleted.