There are a number of alternative formulae that relate BMI to body fat. The method below includes ethnicity and is from a recent paper by Gallagher 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.

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 fill in the table below.

Body Mass Index and Body Fat Calculator

Are you male or female?

Select ethnicity

Enter your age years

Enter your body weight
  in one of the three rows kg
pounds
stone   pounds

Enter your height
  in one of the three rows metres
inches
feet   inches



Calculated bodyfat (%) =

Calculated BMI =
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: Healthy percentage body fat ranges: an approach for developing guidelines based on body mass index, Dympna Gallagher, Steven B Heymsfield, Moonseong Heo, Susan A Jebb, Peter R Murgatroyd and Yoichi Sakamoto. American Journal of Clinical Nutrition, Vol. 72, No. 3, 694-701, September 2000

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