Body Composition Calculators & Clinical Guides

5 Validated Calculators in this Suite

Select any calculator below to open its dedicated analytics console.

US Navy Body Fat Percentage Calculator

Empirical body circumference method adopted by the United States Department of Defense for accurate body composition assessment.

Logarithmic circumference regression modeling height, neck, waist, and hipsCalculate

5 min readNatural Limit Benchmarks

Lean Body Mass (LBM) & FFMI Calculator

Calculate Fat-Free Mass Index (FFMI) and normalized FFMI to evaluate genetic muscle-building limits based on Kouri et al. benchmarks.

FFMI = LBM (kg) / Height (m)² | Normalized = FFMI + 6.1 × (1.8 - Height)Calculate

4 min readAnthropometry

Ideal Body Weight & Bone Frame Size Calculator

Compare Devine, Robinson, Miller, and Hamwi clinical equations with wrist circumference bone frame size calibrations.

Devine, Robinson, Miller, & Hamwi clinical formulas + r-value frame ratioCalculate

6 min readGenetic Limits

Maximum Muscular Potential Estimator

Estimate your genetic ceiling for natural drug-free lean mass and maximum muscle girths using Casey Butt and Martin Berkhan models.

Casey Butt Skeletal Frame Model & Berkhan Leangains EquationCalculate

3 min readCardiometabolic Health

Waist-to-Height Ratio (WHtR) & Health Risk Calculator

Assess deep visceral intra-abdominal adiposity and cardiometabolic risk using the clinically validated Ashwell Shape Chart methodology.

WHtR = Waist Circumference / Height | Target: Keep your waist to less than half your heightCalculate

Physiological Foundations: Body Composition

Clinical standards, peer-reviewed accuracy, and biometric parameters

Calculators within the Body Composition division are built strictly according to peer-reviewed clinical cohorts. All mathematical engines run client-side to protect your personal biometric data with zero telemetry or remote storage.

Review peer-reviewed citations & clinical references