BMR Calculator
BMR Calculator
Calculate your Basal Metabolic Rate (BMR) using the clinically validated Mifflin-St Jeor equation. BMR represents the exact number of calories your body needs to maintain basic life functions at rest.
Patient Metrics
Clinical Precision & Methodology
The Basal Metabolic Rate (BMR) calculator employs the most accurate predictive equations for resting energy expenditure. BMR accounts for approximately 60-75% of your total daily energy expenditure (TDEE).
Mifflin-St Jeor Equation
Introduced in 1990, this formula is endorsed by the American Dietetic Association as the most accurate method for estimating BMR in both normal weight and obese individuals, with an error margin of ~10%.
Revised Harris-Benedict
The original 1919 formula was revised in 1984 by Roza and Shizgal. While slightly overestimating resting energy compared to Mifflin-St Jeor, it remains a heavily utilized clinical standard.
Thermal Receipt Export
Generates a high-resolution, perfectly scaled PNG image designed specifically for 80mm thermal printers, enabling instant clinical handouts.
Formula Comparison
How BMR Calculator Works
Our high-performance online utility runs entirely client-side, processing your files securely and instantly inside your web browser. For related functions, you can also use our Calorie Needs and All Medical Tools utilities.
Enter Age
Step-by-step interactive processing designed for simple, fast, and high-fidelity execution.
Enter Gender
Step-by-step interactive processing designed for simple, fast, and high-fidelity execution.
Enter Measurements
Step-by-step interactive processing designed for simple, fast, and high-fidelity execution.
BMR Equations
Designed for professional results, privacy, and maximum compatibility across all modern desktop and mobile browsers:
Mifflin-St Jeor
Full digital precision and optimized performance with zero server-side latency or external data transfers.
Harris-Benedict
Full digital precision and optimized performance with zero server-side latency or external data transfers.
Daily Energy
Full digital precision and optimized performance with zero server-side latency or external data transfers.
Clinical Use
Full digital precision and optimized performance with zero server-side latency or external data transfers.