How do you check how much fat you have on your body?

Hi My sister is 12 years old and 4'9" and 124lbs. and she is a horseback riding and is pretty healthy and strong and she would like to know how much % of fat is on her body? Please answer! :P

Public Comments

1. the navy seals have a calculator for it google seal body fat calculator.... and horseback riding isn't exercise..
2. http://www.bblex.de/en/calc/navy.php This is the navy calculator. you need to take a few measurements, obviously.
3. the doctor