Body Fat Calculator

Estimate body fat percentage using the US Navy tape-measurement method.

Disclaimer: This result is an estimate for informational purposes only and is not medical advice.

Calculate

Enter your values below.

Result

Estimated body fat
0
Disclaimer: This result is an estimate for informational purposes only and is not medical advice.

Formula used

The US Navy method estimates body fat from waist, neck, height (and hip for females) circumference measurements using a logarithmic formula.

Example: Male, waist 85cm, neck 38cm, height 175cm → body fat ≈ 16.7%.

How to use this calculator

  1. Enter Waist (cm), Neck (cm), Height (cm), Hip (cm) — required for females.
  2. Choose Sex.
  3. Press Calculate to see your result instantly.

FAQ

Frequently asked questions

How accurate is the US Navy method?

It's a reasonably reliable estimate for many people but can be less accurate for very lean or very muscular individuals compared to methods like DEXA scans.

Why do females need a hip measurement too?

The formula uses a different set of measurements for females to better reflect typical body fat distribution.

How do I measure my waist and neck correctly?

Measure your waist at the narrowest point and your neck just below the larynx, keeping the tape snug but not tight.

Is this the same as BMI?

No — BMI only uses height and weight, while this method estimates actual body fat percentage from circumference measurements.