💪 US Navy Body Fat Formula Calculator — US Navy Formula
Calculate body fat using the medically-validated US Navy logarithm formula. Uses the medically-validated US Navy logarithm formula (1–3% accuracy vs DEXA scan). Also shows BMI, Lean Body Mass (LBM), and BMR.
Body Fat Classification (Men)
Body Fat Calculator
Frequently Asked Questions
How accurate is the US Navy body fat formula?
The US Navy formula has been validated against DEXA scans with ~1–3% margin of error. It's more practical than calipers (no skill needed) and more accessible than hydrostatic weighing. It is the standard method used by the US military for fitness assessments.
What measurements do I need?
Men need 3 measurements: height, neck circumference (below the larynx), and waist circumference (at navel level). Measure in centimeters or inches consistently.
What is Lean Body Mass (LBM)?
LBM is your total body weight minus fat mass: LBM = Weight × (1 − body fat%). It includes muscles, bones, organs, and water. Tracking LBM is more meaningful than scale weight — an increase in LBM indicates muscle gain even if total weight stays the same.