Is 11 stone fat for a teenager?

Determining the percent composition of fat to body tissue cannot by known by weight number alone. Once percent by mass of body fat is the variable needed to calculate the mass of fatty tissue. For example 3% body fat would in a 100-pound (lbs.) individual would be 3-lbs. If a soft tissue sample weighed 10-lbs that would be .3-lbs of fat, hypothetically.