BMR Calculator - Basal Metabolic Rate Calculator
Calculate your Basal Metabolic Rate (BMR) - the number of calories your body burns at rest. Our calculator uses scientifically proven formulas to help you understand your daily caloric needs.
What is BMR?
Basal Metabolic Rate (BMR) is the number of calories your body needs to maintain basic physiological functions like breathing, circulation, and cell production while at rest.
Factors Affecting BMR
Age, gender, weight, height, muscle mass, genetics, hormones, and environmental temperature all influence your metabolic rate.
TDEE vs BMR
Total Daily Energy Expenditure (TDEE) includes your BMR plus calories burned through physical activity and exercise.
Calculation Methods
Harris-Benedict: The original BMR formula developed in 1919, revised in 1984. Good for general population.
Mifflin-St Jeor: More accurate formula developed in 1990, especially for overweight individuals. Recommended by nutritionists.
Accurate Calculations
Uses scientifically proven Harris-Benedict and Mifflin-St Jeor equations for precise BMR calculation.
Multiple Goals Support
Calculate calories needed for weight loss, weight gain, or weight maintenance based on your goals.
Activity Level Integration
Incorporates your activity level to calculate Total Daily Energy Expenditure (TDEE) for real-world application.
Instant Results
Get immediate BMR and TDEE calculations with detailed breakdown for different weight goals.
Mobile Optimized
Fully responsive design works perfectly on smartphones, tablets, and desktop computers.
Privacy & Security
All calculations are performed locally in your browser. Your personal data never leaves your device.
Why Calculate Your BMR?
Understanding your BMR is crucial for effective weight management, fitness planning, and maintaining a healthy lifestyle. It provides the foundation for calculating your daily caloric needs.
Common Use Cases
- Weight loss planning and calorie deficit calculation
- Muscle building and bulking calorie requirements
- Weight maintenance and metabolic health monitoring
- Nutrition planning and meal prep calculations
- Fitness goal setting and progress tracking
- General health awareness and lifestyle optimization
Technical Features
Our BMR calculator implements both Harris-Benedict and Mifflin-St Jeor equations with activity multipliers. The tool provides comprehensive calorie recommendations for various weight goals and includes detailed explanations of metabolic calculations.
BMR Calculation Tips
For most accurate results, measure your weight and height in the morning. Remember that BMR decreases with age and increases with muscle mass. Consider consulting a healthcare provider for personalized advice.