The calculator calculates the body fat percentage using the Navy method and the YMCA method. The methods also calculate a rough estimate of body fat percentage and calculate the fat free mass index.
Here, a body fat content may be indicated when e.g. from a body fat measurement a more accurate value than the calculated one is known. By default, the calculated body fat percentage is used after the Navy method.
The Fat Free Mass Index (FFMI) is an index that goes beyond the simple BMI. The BMI does not consider how the weight comes about, whether through muscle or fat. The FFMI is more meaningful here, as it takes into account the body fat percentage. A high FFMI signals a good state of training ie a high amount of muscle. The upper limit for the FFMI is 25 for men and 22 for women. Thus one can read off the potential that can be achieved through training and nutrition in one's own FFMI. Men should aim for a FFMI over 20 and women over 17.
20 to 39
21% to 33%
33% to 39%
40 to 59
23% to 34%
34% to 40%
60 to 79
24% to 36%
36% to 42%
20 to 39
8% to 20%
20% to 25%
40 to 59
11% to 22%
22% to 28%
60 to 79
13% to 25%
25% to 30%
Body fat (Navy, Woman) = 163.205⋅log(waist + hip - neck) - 97.648⋅log(height) - 104.912
Body fat (YMCA, Woman) = (74.11⋅waist - 3482) / weight -8.2
Body fat (Navy, Man) = 86.010⋅log(waist - neck) - 70.041⋅log(height) - 30.30
Body fat (YMCA, Man) = (74.11⋅waist - 4464) / weight -8.2
Units are cm and kg
FFM = weight⋅(100 - Body fat percentage) / 100
FFMI = FFM / height2 + 6.3⋅(1.8 - height)
Units are Body fat in percent, height in m and weight in kg
Wrap the measuring tape around the neck, beginning at about one inch from the meeting of your neck and shoulders. This may also coincide with the bottom part of your Adam's apple. Come fully around the neck, leaving no dangling space in between the neck and the tape. Don't pull too tightly so as to create unnecessary tension, just enough so that you are getting a true measurement. Make sure the tape is level and not being held at an angle.
Find the top of your hip bone and the bottom of your ribs. Breathe out normally. Place the tape measure midway between these points and wrap it around your waist.
Your natural waist is the smallest part of your torso, where your body dips in. Your hips are below that, and they are usually wider than your waist. Your hip measurement includes your butt and your hips. Your hip measurements should be taken at where your hips are the widest. That's because when you're taking measurements, you're trying to get an accurate representation of your body, and the hips represent the widest point on your bottom half.
Here is a list of calculators with which it is easy to calculate the corresponding body indices:Calculation of the Body Indices Calculator for the Body Indices BSI Calculator BMI Calculator AMI Calculator Broca Calculator Ponderal Calculator Body fat and FFMI WHtR Calculator WHR Calculator