Body Mass Index Calculator

The Body Mass Index is used to assess an individuals mass relative to height. (BMI = body mass/height squared). Please note that BMI has been used to determine risks of developing many common diseases, such as Type 2 diabetes, hypertension, and cardiovascular diesease (CVD). It has also been shown to consistently relate to insulin resistance, dyslipidemia, and hypertension in children. It should also be known that BMI is not an excellent predictor for a Body Fat Percentage. BMI is at +/- 5% inacurate. If you are in search for a more accurate body fat percentage, here is a list of tests and their +/- percentages according to their accuracy: 

  1. Skinfold Analisis: +/- 3.5%. (differs with each equation)
  2. Bioelectrical Impedance: +/- 3.5 to 5%  (differs with each equation)
  3. Hydrodensitometry: +/- 2.5% when performed correctly. 
  4. Near-Infrared Interactance: +/- 5% (differs with each equation) 
  5. Plethysmography: Air Displacement (BOD Pod): +/- 2.2% - 3.7% 
  6. Dual-Energy X-Ray Aborptiometry: +/- 1.8% 

Body Mass Index Calculator

Your body mass index is a measure of body fat based on height and weight that applies to both adult men and women.

Weight: lbs
Height (inches): in



Body Mass Index (BMI)
Classification of Body Composition Using BMI
Underweight < 18.5
Normal 18.5-24.9
Overweight 25.0-29.9
Obesity 30.0-39.9
Extreme Obesity >= 40

*Keep in mind that BMI may not be a good predictor of body composition, due to the fact that some individuals carry higher than average amounts of lean mass.

*American Council on Exercise
*Abbott Nutrition