About this Calculator
Unlike BMI, body fat calculations tell you exactly what percentage of your weight comes from fat versus lean muscle tissue.
Formula & Calculations
Mathematical Formula
US Navy Circumference Regression Models
Uses Neck, Waist, and Hip (Female) logs relative to height.
How to Calculate Step-by-Step
1
Neck measure
Wrap horizontally just below larynx.
2
Waist measure
Wrap horizontally at navel level.
3
Hips measure
Wrap at largest pelvic outline (female only).
How to Use & Best Practices
Input circumferences and height. Female profiles require hips measurement.
Frequently Asked Questions
What is essential fat?
Essential body fat is the minimum required for cellular survival and metabolic functions.
How accurate is the tape measure method?
Typically within 3-4% margins compared to DXA scans.