Body Fat Calculator
Jenzzy applies the U.S. Navy method using height and neck/waist/hip measurements for a field estimate.
Inputs
Results
Enter values to see results.
Formula
Navy equations use log10 of circumference ratios with height
Different formulas for men and women combine neck, waist, and hip girth with height.
Example
- Log ratios: Combine waist+hip−neck vs height
- Body fat: ≈ 28.4%= 28.4%
Result: Estimated body fat ≈ 28.4%
Frequently Asked Questions
vs DEXA?
Circumference methods are less precise than lab scans.
When to measure?
Morning, relaxed, same tape tension each time.
Athletes?
Very lean or muscular builds may need alternate methods.