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Body Fat Percentage Calculator

Estimate body fat from tape measurements (US Navy method).

For everyoneWeight & body compositionv1.0.0

Your measurements

Sex

Just below the Adam's apple.

Men: at the navel. Women: at the narrowest point.

Calculated on your device. Nothing is sent to a server.

Your result will appear here

Enter your measurements, then press Calculate.

Methodology

Hodgdon & Beckett US Navy circumference method (1984)

Men: 86.010·log10(waist − neck) − 70.041·log10(height) + 36.76; Women: 163.205·log10(waist + hip − neck) − 97.684·log10(height) − 78.387 (inches)

Uses tape measurements of the neck, waist (and hips in women) with height. It was validated against underwater weighing in US Navy personnel.

Who it is for
Adults aged 18 and over.
Version
1.0.0

Worked example: how to calculate body fat %

Inputs

Sex
Male
Height
178 cm
Neck circumference
38 cm
Waist circumference
85 cm

Result

Body fat
16.5 %

Calculation:

86.010·log10(18.504) − 70.041·log10(70.079) + 36.76 = 16.47

An illustration with sample values, worked out with the same method the tool above uses.

Limitations

  • Typical error is about 3–4 percentage points.
  • Accuracy depends on careful measuring.
  • Not for pregnancy or children.

References

  1. Hodgdon JA, Beckett MB. Prediction of percent body fat for U.S. Navy men and women from body circumferences and height. Reports No. 84-11 and 84-29. San Diego: Naval Health Research Center; 1984.

Continue with your measurements

Shared measurements carry over automatically, in this tab only.