# What determines weight guidelines according to age and height?

According to WebMd, the Body Mass Index (BMI) calculator is the basis for the recommended height and weight scale. The BMI is used to calculate all weight guidelines for people over the age of 20. The CDC provides a separate BMI calculator for people younger than 19.

Measuring BMI involves dividing weight by height; this number is then divided by 703. Generally, a BMI between 18.5 and 24.9 is considered healthy. A person with a BMI under 18.5 is considered under weight. Overweight people have a BMI of 25 to 29.9. A person with a BMI greater than 30 is considered obese.

Although it is the preferred measure for determining weight guidelines, the BMI calculator does not accurately reflect the health of all people. According to WebMD, an athlete will sometimes have a higher BMI due to their larger muscle mass.

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Q&A Related to "What determines weight guidelines according..."
 There are several different factors which affect the weight of a person and when it comes to age and height, there isn't really a correlation between age, height and weight. Due to http://wiki.answers.com/Q/What_is_the_normal_weigh...
 The body mass index (BMI) is a guide that indicates if a person's body mass is healthy in relation to his height. You can ask your doctor or a fitness coach to calculate your BMI. http://www.ehow.com/facts_7390013_should-weight-ac...
 Underweight = <18.5. Normal weight = 18.5-24.9. Overweight = 25-29... http://www.chacha.com/question/what-is-the-ideal-w...
 The average weight for 5'7" is 120 to 140. You are just under the norm and I don't think your too thin. I am 5'7" and I am just over the norm at 144 and I don't think that http://answers.yahoo.com/question/index?qid=200801...