Body Fat (US Navy), Lean Body Mass & Body Surface Area Calculator

Compute US Navy Body Fat %, fat-free Lean Body Mass (kg), Mosteller BSA (m²), and Waist-to-Hip Ratio.

Estimated Body Fat Percentage (US Navy Method)
16%
Lean Body Mass: 63 kg • Fat Mass: 12 kg • BSA: 1.91 m²
Lean Body Mass (Navy / Boer) 63 kg / 58.3 kg
Adipose Fat Mass 12 kg
Body Surface Area (Mosteller) 1.91 m²
Waist-to-Hip Ratio (WHR) 0.88
Inputs
Select appropriate anthropometric regression formula.
kg
Total body mass in kilograms.
cm
Height in centimeters.
cm
Measured horizontally at navel (men) or narrowest abdominal point (women).
cm
Measured just below the larynx.
cm
Largest horizontal gluteal circumference (used in female Navy equation & WHR).
Results & Graph
Estimated Body Fat Percentage (US Navy Method)
16%
Lean Body Mass: 63 kg • Fat Mass: 12 kg • BSA: 1.91 m²
Lean Body Mass (Navy / Boer)
63 kg / 58.3 kg
Adipose Fat Mass
12 kg
Body Surface Area (Mosteller)
1.91 m²
Waist-to-Hip Ratio (WHR)
0.88

Body Mass Composition (kg)

Fat-Free Lean Body Mass vs. Adipose Tissue Mass
Graph 1 • US Navy Body Fat Classification Spectrum Hodgdon-Beckett circumference regression
Essential / Athlete 4 Fitness 14 Acceptable 18 Elevated Adiposity 25 42 16 %
Graph 2 • Fat-Free Lean Body Mass vs. Adipose Fat Mass Skeletal muscle, bone, organs, and total body water vs. fat
BODY WEIGHT 75 kg Fat-Free Lean Mass (63.0 kg) 63 (84.0%) Adipose Fat Tissue (12.0 kg) 12 (16.0%)
Graph 3 • Waist-to-Hip Ratio (WHR) Central Adiposity Scale WHO visceral cardiometabolic risk screening cutoffs
Low Risk (<0.90) 0.65 Moderate (0.90–0.99) 0.9 High Central Risk (≥1.00) 1 1.15 0.88 WHR
Summary: Body weight of 75 kg consists of 63 kg lean mass and 12 kg fat mass (16%).
Summary: Using the US Navy Hodgdon-Beckett circumference formula for a 176 cm, 75 kg male, estimated body fat is 16% (12 kg fat mass and 63 kg fat-free lean mass; Boer formula LBM = 58.3 kg). Mosteller Body Surface Area is 1.91 m² and Waist-to-Hip Ratio is 0.88.
⚠️ Clinical Anthropometry Note: Circumference-based body fat formulas have a standard error of ±3%–4% compared to DEXA scans. Use consistent tape placement at the navel/iliac crest and below the larynx.

Formula & Mathematical Methodology: Hodgdon-Beckett US Navy Body Fat, Boer LBM & Mosteller BSA Equations

Body Fat %male = 4951.0324 − 0.19077 log10(Waist − Neck) + 0.15456 log10(Height) − 450
BSA = Height (cm) × Weight (kg)3600
Male BF% = 495 / [1.0324 − 0.19077 log10(Waist−Neck) + 0.15456 log10(Height)] − 450; BSA = √[(Height_cm × Weight_kg) / 3600]
  • Waist, Neck, Hip, Height: Circumferences and height in centimeters
  • BSA: Body Surface Area in square meters (Mosteller 1987)

Rounding: Rounded to 1–2 decimal places.

Worked Example: Male: 75 kg, 176 cm Height, 84 cm Waist, 38 cm Neck

Estimate body fat percentage, lean mass, and BSA.

  1. Waist − Neck = 46 cm → log10(46) = 1.66276; log10(176) = 2.24551.
  2. Body Fat % = 495 ÷ (1.0324 − 0.3172 + 0.3471) − 450 = 15.9%.
  3. Fat mass = 12.0 kg; Lean Body Mass = 63.0 kg; Mosteller BSA = 1.91 m².
Result: 15.9% Body Fat (63.0 kg lean mass, 12.0 kg fat mass) and 1.91 m² BSA.

Frequently Asked Questions

Why is Body Surface Area (BSA) used in medicine?

Mosteller BSA (in m²) is used in physiology and clinical pharmacology to normalize cardiac index, glomerular filtration rate, and specialized medication dosing.

Health & Fitness • Anthropometry & Body Composition Guide

How to Use the Body Fat (US Navy), Lean Body Mass & Body Surface Area Calculator: Practical Guide & Visual Analysis

Estimate body composition without calipers using the validated Hodgdon-Beckett US Navy tape-measurement equations alongside clinical Lean Body Mass and Body Surface Area formulas. Whether you are researching body fat calculator, us navy body fat formula, army body fat calculator, lean body mass calculator, body surface area calculator, this interactive tool helps you estimate Body Fat Percentage using the US Navy circumference method, Lean Body Mass (Boer & Navy), Mosteller Body Surface Area (BSA), and Waist-to-Hip Ratio.

Interpreting the 3 Custom Visual Graphs & Key Outputs

As you adjust Biological Sex Equation, Body Weight, Standing Height, Waist Circumference, the calculator immediately computes US Navy Body Fat Percentage (%), Lean Body Mass (Navy & Boer in kg), Mosteller Body Surface Area (m²), Waist-to-Hip Ratio (WHR) and updates all three domain-specific SVG charts in real time. Instead of relying on a single static figure, you can inspect the primary domain diagram, component breakdown, and multi-point trajectory curve to see how changing your inputs shifts the final result. Use the Compare (up to 3 scenarios) button to evaluate side-by-side variations before making a decision.

Real-World Benchmark & Planning Tips (Global Clinical & Fitness Reference)

In our benchmark scenario (Male: 75 kg, 176 cm Height, 84 cm Waist, 38 cm Neck), 15.9% Body Fat (63.0 kg lean mass, 12.0 kg fat mass) and 1.91 m² BSA. Keep in mind that tape measurements are taken against bare skin without compressing soft tissue. For related calculations in Health & Fitness, explore BMI Calculator (Body Mass Index), Calorie Needs & TDEE Calculator, Running Pace, One-Rep Max (1RM), Target Heart Rate & Calories Burned Calculator.