How Much Should I Weigh

You may be asking what is body mass index?
The answer is simple - BMI is a measure of your body fat based on your height and weight.
Body mass Index is calculated the same way for adult men, women and children.

For adults the results are used to put people into various categories such as underweight, normal weight, overweight or obese. The ranges of each category are as follows:
Underweight = <18.5
Normal weight = 18.5-24.9
Overweight = 25-29.9
Obesity = BMI of 30 or greater
For children, the results are compared with those of other children of their age, background, race etc.

If you know you height, and weight then you can easily calculate your BMI. There are free BMI calculators available on the Internet you can use to calculate your body mass index.

BMI does not tell you anything about your body fat, because there are other factors to take into consideration, such as muscle mass: fitness level, bone structure, gender and ethnicity. People who have greater bone mass tend to have higher BMI figures, but this does not necessarily mean there is anything wrong with them.
One other consideration is BMI-for-age - BMI calculations in children are used differently for children. Although the BMI for children is calculated the same way as for adults, instead of the categories listed above being used, the value is instead compared with values from children of the same sex and age.
A person's body mass index figure can sometimes just be showing that they are at risk of becoming overweight, and not that they are actually overweight.
Girls between the ages of 12 and 16 have a higher BMI than boys of the same age.
More Information:
Fast Easy Weight Lose.
How Much Should I Weigh.

See also: How Much Should I Weigh?