Reference
The ideal human body weight has been a topic of debate for a very long time. Hundreds of formulas and theories have been invented and put to the test, but the answer is still debatable. The ideal weight should be unique for everyone. The major factors that contribute to a person's ideal weight are height, gender, age, body frame, body type, and so on.
B. J. Devine Formula (1974)
50.0 + 2.3 kg per inch over 5 feet (man)
45.5 + 2.3 kg per inch over 5 feet (woman)