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Body Fat Calculator

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Height
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Results

Body Fat (U.S. Navy Method)
17.5%
Classification: Fitness • BMI Method: 19.5% • Ideal: 10% - 17%
Fat Mass
29.7 lbs
13.5 kg
Lean Body Mass
140.3 lbs
63.6 kg
🎯
Goal Estimation: To reach an ideal body fat of 17%, you would need to lose approximately 0.9 lbs of pure body fat while preserving lean muscle mass.
American Council on Exercise (ACE) Classification
Description Men Women
Essential Fat 2-5% 10-13%
Athletes 6-13% 14-20%
Fitness Your Category 14-17% 21-24%
Average 18-24% 25-31%
Obese 25%+ 32%+
Related: Army Body Fat • Lean Body Mass • Calorie • BMI

Understanding Body Fat Percentage

Body fat percentage is the total mass of fat divided by total body mass, multiplied by 100. It includes essential body fat (required for life and reproductive functions) and storage body fat (fat accumulation in adipose tissue).

How to Measure Accurately with a Tape Measure

  • Neck: Measure just below the larynx (Adam's apple), with tape sloping slightly downward to the front.
  • Waist (Men): Measure horizontally around the abdomen at the level of the belly button (navel).
  • Waist (Women): Measure horizontally at the narrowest point of the torso (natural waistline).
  • Hips (Women only): Measure at the widest horizontal circumference around the buttocks.
Note on U.S. Navy Method: Developed by Dr. Wright and Wilmore at the Naval Health Research Center, this tape-test equation matches DEXA scan accuracy within 3–4% for most individuals when measurements are taken properly.

Understanding your calculation

Method, example and limitations

How the calculation works

Body-fat equations estimate a percentage from measurements such as waist, neck, height and the selected sex setting. The exact tape placement and unit system matter.

Example to check

A body-fat percentage of 20% at 75 kg corresponds to an estimated fat mass of 15 kg and non-fat mass of 60 kg.

Before using the result

Tape-measure equations are approximations and may fit some body types poorly. Measure consistently and consult a qualified professional when body-composition results affect health decisions.

Calculation methodology · Report a result that needs review