Lean Body Mass Calculator (Boer, James & Hume)

Determine fat-free mass, fat mass, and Fat-Free Mass Index (FFMI).

Estimated Lean Body Mass (Boer)
60.07 kg
Hume Equation LBM 56.45 kg
LBM from Body Fat % 65.52 kg
Fat-Free Mass Index (FFMI) 20.68 kg/m²
Inputs
kg
Total body weight in kilograms.
cm
Standing height in centimeters.
%
Optional estimated body fat percentage.
Results & Graph
Estimated Lean Body Mass (Boer)
60.07 kg
Hume Equation LBM
56.45 kg
LBM from Body Fat %
65.52 kg
Fat-Free Mass Index (FFMI)
20.68 kg/m²

Estimated Lean Body Mass (Boer)

Graph 1 • Weight Kg Sensitivity Recalculates the domain equation across 50% to 150% of the primary input while holding other parameters constant.
0 kg 41.0 kg 82.0 kg 50%: 44.2 kg 44.2 50% 75%: 52.14 kg 52.1 75% 100%: 60.07 kg 60.1 100% 125%: 68.01 kg 68.0 125% 150%: 75.95 kg 76.0 150%
Graph 2 • Primary & Supporting Metric Comparison Compares the primary output alongside supporting domain benchmarks.
Estimated Lean Body Mass (Boer) 60.07 kg Hume Equation LBM 56.45 kg LBM from Body Fat % 65.52 kg Fat-Free Mass Index (FFMI) 20.68 kg/m²
Graph 3 • Exact Output Table & Units Displays each calculated output in its exact domain unit.
Estimated Lean Body Mass (Boer)60.07 kgHume Equation LBM56.45 kgLBM from Body Fat %65.52 kgFat-Free Mass Index (FFMI)20.68 kg/m²
Summary: Boer equation estimates 60.1 kg fat-free mass; body-fat subtraction yields 65.5 kg (FFMI 20.7 kg/m²).
Summary: Boer equation estimates 60.1 kg fat-free mass; body-fat subtraction yields 65.5 kg (FFMI 20.7 kg/m²).

Formula & Mathematical Methodology: Lean Body Mass Reference Equation

Boer LBM = 0.407 × weightkg + 0.267 × heightcm − 19.2
Boer LBM = 0.407 × weight_kg + 0.267 × height_cm − 19.2
  • weightKg: Weight Kg (kg)
  • heightCm: Height Cm (cm)
  • bodyFatPct: Body Fat Pct (%)

Rounding: Intermediate calculations retain full IEEE-754 floating-point precision; displayed clinical and fitness metrics round to 1 or 2 decimal places.

Worked Example: Benchmark Scenario: Lean Body Mass

Determine fat-free mass, fat mass, and Fat-Free Mass Index (FFMI).

  1. Enter your current anthropometric, laboratory, or training measurements in the units indicated.
  2. Substitute the values into the reference formula: Boer LBM = 0.407 × weight_kg + 0.267 × height_cm − 19.2.
  3. Compare the primary output and supporting thresholds across all three custom SVG charts.
Result: Evaluates Lean Body Mass using Boer LBM = 0.407 × weight_kg + 0.267 × height_cm − 19.2.

Frequently Asked Questions

How is the Lean Body Mass Calculator (Boer, James & Hume) calculated?

It evaluates Boer LBM = 0.407 × weight_kg + 0.267 × height_cm − 19.2 using your entered parameters and displays supporting clinical or training thresholds alongside three interactive SVG visualizations.

Can I compare multiple scenarios side by side?

Yes. Click the Compare button in the results panel to pin up to 3 input scenarios and inspect how changing any parameter shifts the outcome.

Are my health or fitness inputs stored on any server?

No. Every calculation executes 100% inside your browser tab so sensitive health and wellness numbers never leave your device.

Health & Fitness • Body Composition Guide

How to Use the Lean Body Mass Calculator (Boer, James & Hume): Practical Guide & Visual Analysis

Estimate fat-free Lean Body Mass (LBM) using the Boer, Hume, and body-fat subtraction equations. Adjust the inputs above to view instant numerical outputs, three custom domain-specific SVG graphs, and reference methodology. Whether you are researching lean body mass calculator (boer, james & hume), lean body mass, lean body mass, body composition calculator, this interactive tool helps you estimate fat-free Lean Body Mass (LBM) using the Boer, Hume, and body-fat subtraction equations.

Interpreting the 3 Custom Visual Graphs & Key Outputs

As you adjust Weight Kg, Height Cm, Body Fat Pct, the calculator immediately computes Primary physiological or clinical metric, Supporting reference benchmarks, 3-Panel custom domain SVG visualization 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 & Exercise Physiology Reference)

In our benchmark scenario (Benchmark Scenario: Lean Body Mass), Evaluates Lean Body Mass using Boer LBM = 0.407 × weight_kg + 0.267 × height_cm − 19.2. Keep in mind that uses peer-reviewed population equations and standard physiological constants. For related calculations in Health & Fitness, explore BMI Calculator (Body Mass Index), Calorie Needs & TDEE Calculator, Body Fat (US Navy), Lean Body Mass & Body Surface Area Calculator.