I'm 6'1" and weigh 151lbs. I shoot for 1500 on non-exercise days and 1800 on exercise days (the equivalent of a protein shake with skim milk and berries). Since some days I'm about 100-200 cals over, it evens out and I seem to maintain. The more I exercise, though, the more I tend to lose, so I have to increase my cals on an as-needed basis.
Debi in FoCo, Co