There are various ways of calculating your nutritional condition. They take into account size and weight, perimeters and circles, skin folds and other more complex techniques such as bone mass measurement, fat, muscle mass, content in vitamin, etc.

To obtain a reliable evaluation, often is used Body Mass or Quetelet Index that relates size and weight :

The information obtained varies according to sex, age, physiological condition, anaemic condition, working and physical habits, attitudes, etc. This information should be evaluated by an expert. There is an ideal weight for each person in different moments