FatCalc

Body Fat Percentage Calculator

This body fat calculator can estimate your body's percentage of body fat based on the U.S. Navy method, the BMI method and skinfold measurement methods. It can also calculate how much you should weigh for a healthy amount of body fat.

Your results are shown integrated with charts developed by 3 well known health and fitness organizations. They show your status at your current weight. You can then plan for a goal weight that would put you in one of the healthy body fat percentage ranges.

Body Fat Calculator

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How to Estimate Body Fat?

Although there are a number of different techniques that can accurately measure your percentage of body fat, they can be expensive and inconvenient. Use this online calculator to get a reasonable estimate of your body composition.

You can select measuring body fat percentages by either an estimation method based on your BMI (Body Mass Index), a body circumference method developed by the U.S. Navy or by skinfold measurements.

If you already know your body fat percentage and you are confident of its accuracy, you can simply enter the value manually. You can then note your status in the charts.

Estimate from BMI

This method calculates body fat percentage from Body Mass Index (BMI) using regression equations. The formula takes sex and age into consideration.

This estimation is not as accurate as body circumference or skinfold methods. It does give a ballpark estimate for those of you who don't want to bother with measuring tapes or skinfold calipers. Note also that it's only intended for sedentary individuals.

U.S. Navy Body Fat Calculator

This calculation relies on body circumference measurements. Use a measuring tape made of non stretchable material, preferably fiberglass. Measure your circumferences carefully with the same amount of tension at exactly the same spot each time you make a measurement. This will provide you with a consistent estimate on which to chart your progress.

The measuring tape should be applied to just make contact with the skin and conform to the body surface being measured. Don’t compress the underlying soft tissues. Make sure all measurements are made in the horizontal plane (parallel to the floor). All measurements, including height and weight should be made while you are in thin underclothes and without shoes.

Neck, waist and hip circumference measurements are taken differently for men and women. The formula does not require hip measurements for men. Waist measurements are taken at the belly button for men, and above the belly button for women.

When measuring, ensure the tape is level and parallel to the floor. Apply sufficient tension on the tape to minimize the effect of any clothing. Ensure that the tape is level and parallel to the floor. Keep arms at the side.

For males:

Measure neck circumference at a point just below the larynx (Adam’s apple). Don’t place the tape measure over the Adam’s apple. Look straight ahead during the measurement, with shoulders down (not hunched).

Keep the tape as close to horizontal as anatomically feasible. Measure waist circumference against the skin at the belly button level and parallel to the floor. Keep arms at the sides.

For females:

The neck measurement is taken the same way as taken for males. Measure waist (abdomen) circumference against the skin at the skinniest part of the waist. This is usually about halfway between the navel and the end of the sternum (breastbone).

Hip measurements should be taken by placing the tape around the hips and passing over the greatest protrusion of the buttocks as viewed from the side.

The accuracy of the U.S. Navy Body Circumference method is comparable to skinfold methods, around 3.5% for most people.

Skinfold Measurements

Skinfold testing can predict body fat percentages within plus or minus 3.5 percent of your true body composition. Generally the more skinfold sites measured, the greater the accuracy. However, both the U.S. Navy body circumference method and skinfold testing can lose accuracy for the obese or extremely lean individuals.

For skinfold measurements, please refer to your skinfold caliper manual for instructions. As a general rule, skinfold measurements should always be taken from the right side of the body.

Take a minimum of two measurements at each skinfold site. If the two measurements differ by more than 2 mm, take a 3rd. Record the average for the site.

Jackson-Pollock 3-Site Skinfold Method

This is a simple method that you can perform yourself. It is fairly accurate for most people with an average build. However, it tends to underestimate body fat for athletes, body builders or very lean individuals.

The skinfold measurement sites differ for men and women. The formula uses the chest, abdomen and thigh for males; the tricep, suprailiac and thigh for women.

Jackson-Pollock 4-Site Skinfold Method

With this method, the skinfold measurement sites are the same for both males and females. Four sites are used which makes this method slightly more reliable than the 3 site method but again, it loses accuracy for very lean individuals.

Jackson-Pollock 7-Site Skinfold Method

This method produces the most reliable results of the three Jackson-Pollock series of skinfold measurements. The test uses seven skinfold sites the locations of which are the same for both males and females.

Durnin-Womersley Skinfold Method

The Durnin-Womersley method is probably the most popular skinfold measurement methods used but it tends to overestimate body fat for very fit individuals. It utilizes four skinfold measurements at the same four skinfold sites for both males and females.

Body Fat Percentage Calculation Results

The results of the calculations will show your body fat percentage status in charts developed by the American Council on Exercise, the NIH Health / Guidelines, and the American College of Sports Medicine.

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References

  1. Obesity and overweight
    World Health Organization
  2. Development of the DoD Body Composition Estimation Equations.
    Hodgdon, James A.; Friedl, Karl
    NAVAL HEALTH RESEARCH CENTER SAN DIEGO CA
  3. Generalized equations for predicting body density.
    Jackson, A.S., Pollock, M.L.
    British Journal of Nutrition. 40: 497-504, 1978.
  4. The effect of sex, age and race on estimating percentage body fat from body mass index.
    Jackson AS, Stanforth PR, Gagnon J, Rankinen T, Leon AS, Rao DC, Skinner JS, Bouchard C, Wilmore JH.
  5. Healthy percentage body fat ranges: An approach for developing guidelines based on body mass index.
    Gallagher D, Heymsfield SB, Heo M, Jebb SA, Murgatroyd PR, Sakamoto Y.

Last Update: Oct 18, 2020 16:51