QuickStats: Mean Percentage Body Fat, by Age Group and Sex – National Health and Nutrition Examination Survey, United States, 1999–2004 As such, BMI is a useful indicator of overall fitness for a large group of people, but a poor tool for determining the health of an individual.

While BMI largely increases as adiposity increases, due to differences in body composition, other indicators of body fat give more accurate results for example, individuals with greater muscle mass or larger bones will have higher BMIs.

The widely used body mass index (BMI) provides a measure that allows the comparison of the adiposity of individuals of different heights and weights. The body fat percentage is a measure of fitness level, since it is the only body measurement which directly calculates a person's relative body composition without regard to height or weight. A number of methods are available for determining body fat percentage, such as measurement with calipers or through the use of bioelectrical impedance analysis. Storage body fat consists of fat accumulation in adipose tissue, part of which protects internal organs in the chest and abdomen. The percentage of essential body fat for women is greater than that for men, due to the demands of childbearing and other hormonal functions. Essential body fat is necessary to maintain life and reproductive functions. The body fat percentage ( BFP) of a human or other living being is the total mass of fat divided by total body mass, multiplied by 100 body fat includes essential body fat and storage body fat.

Measuring body fat with caliper