Q: how much should a 15 year old 5 foot 3 male weigh?

A: About 110 pounds is average, but healthy weight range is pretty wide. If you weigh a lot less than 110, then just eat more and you'll catch up! In fact if you are underweight now and start eating more and are physically active (sports, weight training, etc) you are in excellent position to build great physique over the next several years.

If you weigh a lot more than 110, then start eating healthier (less junk and processed foods, more fruits, vegetables, whole grains and lean meats) and become more physically active and your continuing growth will take care of the extra fat. Think of it this way: 160 pounds at 5 foot 3 inches is overweight, but same 160 pounds at 5 foot 9 inches is a perfectly healthy weight! So don't try to lose weight unless your doctor suggests it -- just eat healthy and stay active and let your growth burn the extra fat.