If a 13 year-old girl is 5'5 and weighs 155lbs is she considered fat?

Go to http://kidshealth.org/teen/food_fitness/dieting/bmi.HTML , or search "BMI and teens" to calculate body mass index for teens. The above website is quite good and calculates Body Mass Index for children ages 2-20 based on age, gender, height and mass and has a colour chart showing the masses considered underweight, healthy, overweight and obese.

Go to http://kidshealth.org/teen/food_fitness/dieting/bmi.HTML , or search "BMI and teens" to calculate body mass index for teens. The above website is quite good and calculates BMI for children ages 2-20 based on age, gender, height and mass and has a colour chart showing the masses considered underweight, healthy, overweight and obese.