How much should a 13-year-old weigh who is 5'7?

Answer 1

It's hard to say what someone should weigh, as weight is based on frame size and percent bodyfat. At that height you should probably weigh somewhere from 120 - 170.

BMI is usually a good rule of thumb, but it may be misleading for athletes. You can use a calculator at http://www.nhlbisupport.com/bmi/bmicalc.htm?htf=5&hti=7&wt=120&bmi=21.9