If you are using this to gauge your experience level for competiton (as to what division you should enter) the accepted method is the calendar. You dont get to train a couple years, and say since you only trained a day or two a week, you should be in a 6mo experience division.
If, however, it is your first competition, sandbagging is nothing new in the novice/beginner divisions and you wont really be hurting anyone if you enter them (guaranteed in one wt div in the beginner div, there is sure to be at least one college wrestler there), just be aware when you pull off some great move, you may be beating some poor guy who just started training two months ago. So the real question is are you competing to feel good about yourself, or to improve yourself (by testing your skills)?