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Body Fat and Body Mass Index

Body fat can be estimated from your Body mass index or BMI. There are a number of alternative formulae that relate BMI to body fat. We have chosen the calculation from Deurenberg et al. But remember, although these calculations are based on equations published in peer reviewed journals they are only an estimate and there will be variations around the results.

Note: The body mass index is calculated from an individual's weight divided by the square of the height. The U.S. National Heart, Lung and Blood Institute uses the body mass index to classify obesity.

To calculate your BMI and body fat estimate use the following online calculator.

Body Fat and Body Mass Index Calculator

Are you male or female?      
Enter your age   years  
Enter your body weight
  in one of the three rows
stone   pounds  
Enter your height
  in one of the three rows
feet   inches   
 Estimated body fat (%) =   
 Calculated BMI number =   
BMI Classification =   

The BMI values correspond to the following body analysis:

  • Underweight = <18.5
  • Normal weight = 18.5-24.9
  • Overweight = 25-29.9
  • Obesity = BMI of 30 or greater

Reference: Body mass index as a measure of body fatness: age- and sex-specific prediction formulas. Deurenberg P, Weststrate JA, Seidell JC. Br J Nutr, Mar 1991;65(2):105-14.

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Disclaimer: The information provided by Diet & Fitness Today is for general information and should not be used during any medical emergency or for the diagnosis or treatment of any medical condition. You should always consult a licensed physician or medical professional for diagnosis and treatment of any medical condition and before starting any weight loss or fitness regime.