Just count the "V's" if you're doing stockinette stitch or ribbing. Include the stitch on your needle, above the last V. For example, if you look on the Cast-On page, at the second picture from the top, which shows Double CO in ribbing, you can count 12 V's. The bottom V was done during the cast-on, because that cast-on creates an already knitted row, and then there were 11 more rows done after that (that are shown in the picture).
If you're working in garter stitch, you can count the "ridges." Every two rows creates one ridge. If you have six ridges on the front, and six on the back, you have done 12 rows. 6 on one side and 5 on the other side means you've worked 11 rows.
Happy Holidays and happy knitting!
KnittingHelp Queen Bee
"There is a vitality, a life force, an energy, a quickening that is translated through you into action, and because there is only one of you in all of time, this expression is unique. And if you block it, it will never exist through any other medium and it will be lost. The world will not have it. It is not your business to determine how good it is nor how valuable nor how it compares with other expressions. It is your business to keep it yours clearly and directly, to keep the channel open. You do not even have to believe in yourself or your work. You have to keep yourself open and aware to the urges that motivate you. Keep the channel open."
— Martha Graham