View What Is The Average 13 Year Old Weight Images. During this period it is quite possible to gain and lose weight rapidly, as well as add inches to their heights seemingly overnight. However, many babies who are born prematurely gain weight rapidly in the first months and can catch up in weight by the first year or so.
The average height of a 13 year old now is considered to be 58 to 62 inches for boys and 60 to 63 inches for girls.
Body mass index is defined as the individual's body weight divided by the square of his or her height. The normal weight range is 75 to 147 pounds for girls and 74.5 to 144 pounds for boys. 13 year old needs to lose weight. At age 13, most teenagers are well into puberty and may be in the middle of or about to embark on growth spurts.