Most ideal body weight calculators are based on simple measurements of height. However, newer research suggests that health may not be correlated directly to weight, but to your perception of your weight.
Those that are happy with their weight tend to be healthier, compared with those who are unhappy.
This chart determines the ideal weight for your height. The ideal weight depends upon your gender. You can check your weight against your height to see whether you fall within the ideal weight for height zone.
You could be underweight because of several reasons. You can work out to increase your body mass.
Now that you fall into this category, you must already be feeling awesome! Continue to eat a balanced diet and keep working out!
One may be overweight due to many reasons. The most common cause is excessive body fat. Concentrate on reducing your body fat through diet & exercise!