Comparative Calorimetry · 3-Equation Regression Audit
Clinical BMR Equation Benchmarks & Specifications
The Clinical BMR Equation Benchmarks specification compares Mifflin-St Jeor (1990), Revised Harris-Benedict (1984), and Katch-McArdle (1996) regression constants against indirect calorimetry standards (±10% RMR variance).
3-Equation BMR Comparative Telemetry Workbench
Anthropometric & Clinical Parameters
Lean Body Mass (LBM): 71.4 kg
Reverse Target-Weight & Timeline Solver
Compute exact daily caloric intake to reach a target weight by your deadline
ACSM Activity Multiplier Expenditure Spectrum
Click any tier to switch multiplier and inspect daily caloric variance
Personalized 4 / 8 / 12-Week Body Recomposition Trajectory (Starting at 84 kg)
Modeled via the 3,500 kcal per pound adipose tissue energy equivalence standard
| Predictive Model | Publication Cohort | Primary Predictors | Calorimetry Accuracy |
|---|---|---|---|
| Mifflin-St Jeor (1990) | n = 498 healthy adults (normal & obese BMI) | Mass (kg), Stature (cm), Age (y), Sex (+5 / −161) | ±10% in 82% of non-obese adults (AND Gold Standard) |
| Revised Harris-Benedict (1984) | Roza & Shizgal re-calibration (n = 337) | Sex-stratified intercept + Mass, Stature, Age | Overestimates RMR by ~5% in modern sedentary adults |
| Katch-McArdle (1996) | Athletic & body-composition verified cohorts | Lean Body Mass (FFM kg) via Body Fat % | Highest precision when DEXA/caliper BF% is known |
A systematic review by the Academy of Nutrition and Dietetics (Frankenfield et al., 2005) established that the Mifflin-St Jeor equation calculates resting metabolic rate with the narrowest error band across general adult populations, whereas Katch-McArdle outperforms height-weight regressions in muscular athletes. Our verification suite interpolates all three equations simultaneously, derives Lean Body Mass, maps ACSM activity tiers in the ACSM PAL Matrix, simulates recomposition in the Katch-McArdle LBM Simulator, and benchmarks caloric density across the BMR & TDEE Calculator, Boom Boom Sauce Density engine, Sauce Macro Matrix, and Pickled Radish Satiety Index.