Body Fat Calculator
Estimate body fat percentage with the US Navy method
100% private. Your files and inputs never leave your device — everything runs locally in your browser.
How to Use Body Fat Calculator
Estimate body fat percentage with the US Navy method. No signup, no uploads, no watermarks.
- 1
Enter your numbers in the input fields.
- 2
Choose the calculation options or frequency.
- 3
The result updates instantly as you type.
- 4
Review the breakdown, chart, or schedule, and copy the answer.
Why choose Body Fat Calculator?
- No uploads — your files never leave your device.
- Free forever with no signup, no watermarks, and no limits.
- Works on any device with a modern browser — no installs.
- Fast, private, and built for getting the job done in seconds.
Frequently Asked Questions
How accurate is the US Navy body fat formula?▾
Circumference-based estimates are reasonably accurate for most people (within a few percent) but less precise than DEXA or hydrostatic weighing.
Why is hip measurement only used for females?▾
The Navy equation for men only uses waist and neck because male fat distribution concentrates around the waist, while women also carry fat around the hips.
Related Tools
BMI Calculator
Calculate your Body Mass Index and healthy weight range
One Rep Max Calculator
Estimate your one-rep max from any set
BMR Calculator
Estimate basal metabolic rate and daily calorie needs
Body Surface Area Calculator
Calculate body surface area with multiple medical formulas
Daily Calorie Needs Calculator
Find maintenance calories and targets for weight goals
Calories Burned Calculator
Estimate calories burned across dozens of activities
Pregnancy Due Date Calculator
Estimate your due date and current pregnancy week
Heart Rate Zones Calculator
Find your target heart rate zones for training