Body mass index is a mathematical calculation including family story, gender, except age, length and weight. With this calculation, it can cause wrong result in very muscled people, pregnant and nursing mother. 

BMI is calculated as follows.

Body Mass Index (BMI) (kg/m2) =   Weight (kg)         

                                                       Length x Length (m2)  

According to body mass index results, the patient’s weight status is interpreted as follows:

BMI   Situation

Weak

19-25  Normal

25-30  Over Weight

30-40  Obesity (Fatness Disease)

40-50  Morbid Obesity

50-60  Super Obesity

60-70  Super Super Obesity 

>70     Hyper Obesity