How accurate is the US Navy method?
It provides a solid estimate when measurements are precise, but DEXA scans and calipers deliver more accurate body composition data.
Step-by-step walkthrough
Body Fat % (US Navy) Guide
Use this companion guide beside the interactive calculator to make sure you understand the “why” behind every click. Each section includes the classroom explanation, student-friendly language, and quick practice prompts.
Before you start
Collect the data points listed below and double-check their units. Keeping an organized “givens” list is one of the fastest ways to reduce math errors and impress exam graders.
- body fat
- composition
Detailed procedure
Step 1
Select gender to toggle the correct circumference fields.
Step 2
Enter height plus waist, neck, and (for females) hip measurements in centimeters.
Step 3
Provide body weight to translate the percentage into lean and fat mass estimates.
Teaching & troubleshooting tips
Can I enter measurements in inches?
At the moment the calculator expects centimeters. Convert inches to centimeters (multiply by 2.54) before entering your numbers.