University of Rome "Tor Vergata"

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Department of Mathematics
Unit of Biostatistics

Department of Biomedicine and Prevention
Unit of Human Nutrition

National Institute for Mediterranean Diet and Nutrigenomic, I.N.Di.M.

Predicted Percentage of Body Fat in Women

The percentage of body fat (PBF) in women is predicted based on height, weight, hip and waist circumferences.

Please enter data in the corresponding boxes.
What is the height? (cm)
What is the weight? (kg)
What is the waist? (cm)
What is the hip? (cm)


waist hip

A classification of the degree of obesity is given in the following table:

Age Underweight Normal Preobese Obese
Percentage Body Fat Classification for Women
<20 <17.0 [17.0, 27.0) [27.0, 32.0) ≥32.0
[20,30) <18.0 [18.0, 28.0) [28.0, 33.0) ≥33.0
[30,40) <19.0 [19.0, 29.0) [29.0, 34.0) ≥34.0
[40,50) <20.0 [20.0, 30.0) [30.0, 35.0) ≥35.0
≥50 <21.0 [21.0, 31.0) [31.0, 36.0) ≥36.0

The PBF calculator estimates the PBF obtained by Dual X-ray Absorptiometry (DXA) through a predictive equation based on easily available anthropometric measures and offers to clinicians a friendly tool to assess the body fat percentage of their patients. The proposed equation was derived from a sample of 1009 adult Italian Caucasian women who had complete data on both body composition analysis obtained by DXA and anthropometric measures. A multivariate regression model was fitted to the observed data. Weight, height, age, waist, hip circumference and their fractional polynomial transformations were considered as explanatory variables. In order to assess the predictive ability of the proposed equation a validation set of 134 women was used.