SuperCalX

Body Fat Calculator

Estimate your body fat percentage using the US Navy fitness formula.
Calculator
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Analysis
Interpretation of the current calculator output

Enter values to see detailed analysis and insights.

How to Use

Step-by-step instructions
  1. 1Select your gender.
  2. 2Enter your height, weight, neck, and waist measurements.
  3. 3For females, also include hip measurements.
  4. 4The results will display your estimated body fat percentage and category.

US Navy Fitness Formula

The US Navy Body Fat formula is a simple method to estimate body fat percentage based on circumferences of various body parts.
BF% = 495 / (1.0324 - 0.19077 × log10(waist-neck) + 0.15456 × log10(height)) - 450

Variables:

BF%Body Fat Percentage
waistWaist circumference
neckNeck circumference
heightTotal height

Example

Standard Male Measurement

Inputs:

Height:175 cm
Weight:75 kg
Waist:85 cm
Neck:38 cm

Steps:

  1. 1.Apply log calculations based on measurements.
  2. 2.Subtract scaling factors.
  3. 3.Determine final percentage.
Result:
16.1% (Fitness Category)

Frequently Asked Questions

How accurate is this calculator?

While not as accurate as DEXA scans or hydrostatic weighing, the US Navy formula is accepted as a reliable estimation with a 3-4% margin of error for most individuals.