Body Density Calculator

Enter the skinfold measurements (mm) of the biceps, triceps, subscapular, and iliac into the calculator to determine the body density.

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Body Density Formula

The following formula is used to calculate a body density.

D= 1.1422 – [.0544*log (skinfold sum (mm) ) ]

• Where D is the body density (g/m^3)
• skinfold sum = skinfold of biceps + triceps + subscapular + iliac

This equation is used for males age 30-39. The following table displays the formula how males and females of different ages. In the formula below, log(s)= log(skinfold sum of the 4 measurements)

Age	Men	Women
< 17	D = 1.1533 – (0.0643 * log(s))	D = 1.1369 – (0.0598 * log(s))
17-19	D = 1.1620 – (0.0630 * log(s))	D = 1.1549 – (0.0678 * log(s))
20-29	D = 1.1631 – (0.0632 * log(s))	D = 1.1599 – (0.0717 * log(s))
30-39	D = 1.1422 – (0.0544 * log(s))	D = 1.1423 – (0.0632 * log(s))
40 -49	D = 1.1620 – (0.0700 * log(s))	D = 1.1333 – (0.0612 * log(s))
> 50	D = 1.1715 – (0.0779 * log(s))	D = 1.1339 – (0.0645 * log(s))

Body Density Definition

What is a body density? A body density is defined as the total mass per unit volume of an individual human. It’s often estimated using a formula like the one above, which takes skinfold measurements throughout the body.

Example Problem

About Body Density

How can body density be used to calculate body fat %? Using the Siri equation, a body fat percentage can be calculated using body density. This equation states bodyfat% = (457-body density) -414.

What are skinfolds? Skinfolds are specific locations on the body that skin is pulled and measured to determine the body fat percentage of an individual.