Human Ideal Weight:
The Body Mass Index

One of oldest and still most popular applications of regression analysis is modeling Human Ideal Weight by means of Body Mass Index (BMI).

Body Mass Index or BMI is the standardized method for determining whether your body weight and the amount of body fat you have are in a healthy range. A BMI Metric Calculator uses a weight-to-height ratio (BMI = kg/m2) and assigns a number to the result. To get your approximate BMI using English system, multiply your weight in pounds by 703, then divide the result by your height in inches, and divide that result by your height in inches a second time, i.e. BMI = 703W/h2

The BMI ranges for adults are shown in the table. They are not exact ranges of healthy and unhealthy weights.

Medical evidence suggests that all body weights within the highlighted healthy range are reasonably equally healthy (for people of your height). Outside this range, health risks may occur.

Notice that, for example, a large waist and wide hips signal accumulation of so-called "intra-abdominal fat" -- the particularly harmful deep "hidden" fat that surrounds the abdominal organs and is linked to diabetes, high blood pressure and heart disease. Therefore, one must reflects on other fat distribution different from that indicated by weight and height.

Waist-Hip Ratio: Divide your waist size at its smallest by your hip size at its largest and you get a key to how much fat is stored in the abdomen, where it raises the risk of heart disease. The lowest healthy ratio is not yet known. But many experts agree that women with ratios of 0.8 or lower and men with ratios of 1 or lower are in good shape.

Enter your weight and height in Metric (or English) systems then click on the "Calculate" button.

BMI = 703 Weight / Height2

BMI English Calculator

Enter Your Weight:
(in pounds)

Enter Your Height:


Your BMI:

Adults Women Men
Anorexia Less than 17.50
Underweight 17.51-19.10 17.501-20.70
Ideal range 19.11-25.80 20.71-26.40
Marginally overweight range 25.81-27.30 26.41-27.80
Overweight range 27.31-32.30 27.81-31.10
Very overweight or Obese range More than 32.30 More than 31.10

BMI = Weight / Height2

BMI Metric Calculator

Enter Your Weight:
(in Kilos)

Enter Your Height:
(in Centimeters)

Your BMI:

For Technical Details, Back to:
Statistical Thinking for Decision Making

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Professor Hossein Arsham

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