According to the standard set by World Health Organization, an adult body mass indicator (BMI) is around 25 to 29.9 as overweight; Lies between 30 to 39.9 for to be obesed; If it is over 40 or above then it is extremely obesed. Also may refer to the adult standard body weight table, if the body weight surpasses the standard in 20% as overweight, surpasses above 20% as obesed.
Body Mass Indicator (BMI) = Weight (Kg) / Height (M) square
Each MM use in this equation to calculate overweight for yourself