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Please enter values and select units:
Gender: Male  Female 
Weight:   
Height:   
Neck:   inches
Waist:   inches
Hip:   inches
Result:
Fat index = 17.9 %,
Body fat mass = 29.5 lbs,
Lean Body Mass = 136 lbs,
14-17%: general fitness.
The Navy's Body Fat Index uses waist, hip, and neck measurements, as well as height, instead of weight and age. This means the formula is quite complicated, involving logarithms and official instructions that differ for men and women. More about Body Fat Index (BFI) here

Body fat index table (chart) for Male. The waist is different. Height is equal to 69 inches, and neck is equal to 16 inches
The data in the tables (charts) will change according to your body calculations in the form above.

30.25 in 7.55 %
30.5 in 8.16 %
30.75 in 8.77 %
31 in 9.36 %
31.25 in 9.94 %
31.5 in 10.5 %
31.75 in 11.1 %
32 in 11.6 %
32.25 in 12.2 %
32.5 in 12.7 %
32.75 in 13.3 %
33 in 13.8 %
33.25 in 14.3 %
33.5 in 14.9 %
33.75 in 15.4 %
34 in 15.9 %
34.25 in 16.4 %
34.5 in 16.9 %
34.75 in 17.4 %
35 in 17.9 %
35.25 in 18.3 %
35.5 in 18.8 %
35.75 in 19.3 %
36 in 19.7 %
36.25 in 20.2 %
36.5 in 20.7 %
36.75 in 21.1 %
37 in 21.6 %
37.25 in 22 %
37.5 in 22.4 %
37.75 in 22.9 %
38 in 23.3 %
38.25 in 23.7 %
38.5 in 24.1 %
38.75 in 24.6 %
39 in 25 %
39.25 in 25.4 %
39.5 in 25.8 %
39.75 in 26.2 %
40 in 26.6 %
40.25 in 27 %
40.5 in 27.4 %
40.75 in 27.8 %
41 in 28.1 %
41.25 in 28.5 %
41.5 in 28.9 %
41.75 in 29.3 %
42 in 29.6 %
42.25 in 30 %
42.5 in 30.4 %
42.75 in 30.7 %
43 in 31.1 %
43.25 in 31.5 %
43.5 in 31.8 %
43.75 in 32.2 %
44 in 32.5 %
44.25 in 32.9 %
44.5 in 33.2 %
44.75 in 33.5 %
45 in 33.9 %
45.25 in 34.2 %
45.5 in 34.6 %
45.75 in 34.9 %
46 in 35.2 %
46.25 in 35.5 %
46.5 in 35.9 %
46.75 in 36.2 %
47 in 36.5 %
47.25 in 36.8 %
47.5 in 37.1 %
47.75 in 37.5 %
48 in 37.8 %
48.25 in 38.1 %
48.5 in 38.4 %
48.75 in 38.7 %
49 in 39 %
49.25 in 39.3 %
49.5 in 39.6 %
49.75 in 39.9 %
50 in 40.2 %

Body fat index table (chart) for Male. The height is different. Waist is equal to 35 inches, and neck is equal to 16 inches

60.25 in 21.9 %
60.5 in 21.8 %
60.75 in 21.7 %
61 in 21.5 %
61.25 in 21.4 %
61.5 in 21.3 %
61.75 in 21.2 %
62 in 21.1 %
62.25 in 20.9 %
62.5 in 20.8 %
62.75 in 20.7 %
63 in 20.6 %
63.25 in 20.5 %
63.5 in 20.3 %
63.75 in 20.2 %
64 in 20.1 %
64.25 in 20 %
64.5 in 19.9 %
64.75 in 19.8 %
65 in 19.6 %
65.25 in 19.5 %
65.5 in 19.4 %
65.75 in 19.3 %
66 in 19.2 %
66.25 in 19.1 %
66.5 in 19 %
66.75 in 18.8 %
67 in 18.7 %
67.25 in 18.6 %
67.5 in 18.5 %
67.75 in 18.4 %
68 in 18.3 %
68.25 in 18.2 %
68.5 in 18.1 %
68.75 in 18 %
69 in 17.9 %
69.25 in 17.8 %
69.5 in 17.6 %
69.75 in 17.5 %
70 in 17.4 %
70.25 in 17.3 %
70.5 in 17.2 %
70.75 in 17.1 %
71 in 17 %
71.25 in 16.9 %
71.5 in 16.8 %
71.75 in 16.7 %
72 in 16.6 %
72.25 in 16.5 %
72.5 in 16.4 %
72.75 in 16.3 %
73 in 16.2 %
73.25 in 16.1 %
73.5 in 16 %
73.75 in 15.9 %
74 in 15.8 %
74.25 in 15.7 %
74.5 in 15.6 %
74.75 in 15.5 %
75 in 15.4 %
75.25 in 15.3 %
75.5 in 15.2 %
75.75 in 15.1 %
76 in 15 %
76.25 in 14.9 %
76.5 in 14.8 %
76.75 in 14.7 %
77 in 14.6 %
77.25 in 14.5 %
77.5 in 14.4 %
77.75 in 14.3 %
78 in 14.3 %
78.25 in 14.2 %
78.5 in 14.1 %
78.75 in 14 %
79 in 13.9 %
79.25 in 13.8 %
79.5 in 13.7 %
79.75 in 13.6 %
80 in 13.5 %

What is the formula of Navy BFI method?

Question and Answer  The formula for men:
BFI % = 495 / (1.0324 − 0.19077 × log10(waist[cm] − neck[cm]) + 0.15456 × log10(height[cm])) − 450
BFI % = 86.010×log10(abdomen[inches] - neck[inches] ) - 70.041×log10(height[inches] ) + 36.76
Question and Answer  For women:
BFI % = 495 / (1.29579 - 0.35004 * log10(waist[cm]+hip[cm]-neck[cm]) + 0.22100 * log10(height[cm])) - 450;
BFI % = 163.205×log10(waist[inches]+hip[inches]-neck[inches]) - 97.684×(log10(height[inches])) - 78.387

How the parameter is calculated?

Question and Answer  The Navy BFI is an important indicator of health, which uses waist, hip, and neck measurements, as well as height and gender.

Is this BFI calculator proper for both men and women?

Question and Answer  Yes, this converter is suitable for both women and men. However, there are groups of people for whom this formula does not work.

Is this BFI calculator proper for both men and women?

Question and Answer  Yes, this converter is suitable for both women and men.

How to determine, figure out the BFI for a woman and a man?

Question and Answer  The ranges for men:
26% or higher: overweight or obese; 18-25%: acceptable or average; 14-17%: general fitness; 6-13%: athletes.
Question and Answer  The ranges for women:
32% or higher: overweight or obese; 18-25%: acceptable or average; 14-17%: general fitness; 6-13%: athletes.

What increases the weight, which is so difficult to lose afterwards?

Question and Answer  Did you know that sudden weight gain isn't just about overeating? Absolutely not! Sometimes, obesity can be influenced by factors that seem completely unrelated to our love for baked goods or Big Mac.
Intolerance to certain products can lead to weight gain. Some products can cause allergic reactions and fluid retention in the body, ultimately resulting in weight gain. The following are the different groups of people for whom this is determined in various ways. A passion for sour gherkins, or dried fish can also "earn" you a few kilograms. Salt itself does not make us fat; fat does not accumulate from it because it has no calories. However, food with a lot of salt causes fluid retention in the body, increasing weight, especially for people with disturbed water and salt balance. A portion of sauerkraut eaten in the evening can turn into one and a half to two extra kilograms by morning. Sometimes, we gain weight from sports or lack of sleep. Especially those people who just started training. If we do not sleep regularly, the need for sweets increases (which in itself does not promote slimness), and the body's metabolism slows down.
When we decide to start losing weight, stepping on the scale is often the first step. But have you ever wondered if the number you see really reflects your health status and progress? More about weight loss and BFI

What units of measurement does this calculator use?

Question and Answer  This tool can calculate using the metric measurement system (kilos, centimeters and meters) as well as imperial units ( pounds, inches and feet). If you need some non-standard things here, please write in the comments.
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