About BMR Calculator
Calculate resting daily calorie expenditure at vital biological equilibrium using the clinical Mifflin-St Jeor, Revised Harris-Benedict (1984), and body fat-based Katch-McArdle equations.
Key Capabilities & Features
- Mifflin-St Jeor formula calculation (gold standard in clinical dietetics)
- Revised Harris-Benedict equation (Roza & Shizgal 1984 revision)
- Katch-McArdle equation factoring lean body mass for individuals with known body fat %
- Metric (kg, cm) and Imperial (lbs, ft-in) input toggles
How to Use BMR Calculator
1
Enter Age & Sex
Input biological age and sex for metabolic decay scaling.
2
Input Stature & Weight
Provide height and body mass.
3
Review BMR Formulations
Inspect calories burned at rest across the 3 scientific equations.
Privacy & In-Browser Execution Guarantee
100% client-side calculation. Your data never leaves your browser.
Frequently Asked Questions
What is BMR?
Basal Metabolic Rate is the minimum daily energy expenditure required to sustain vital organ functions (brain, heart, kidneys, lungs) in a resting state.
Why is Katch-McArdle different?
Katch-McArdle bases metabolic rate exclusively on Lean Body Mass (LBM) rather than total weight, making it highly accurate for lean athletes and bodybuilders.
Related Tools in this Suite
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Calculate Total Daily Energy Expenditure based on physical activity multipliers
Calorie Deficit & Surplus Calculator
Plan daily calorie targets for mild, standard, or aggressive weight loss and lean bulking
Macro Calculator
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