How do you keep track of how many words you know?

Keeping track of my vocabulary count is very motivating, how do you go about tracking how many words you know in a new language you are learning? At first I was simply looking at my card count in my SRS, but now that I am starting to create multiple cards per word and will soon be adding grammar cards I need a new method for keeping count. Any ideas?

* Originally posted by hdykiel.