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Revised Harris-Benedict Equation:
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The Revised Harris-Benedict Equation estimates Basal Metabolic Rate (BMR), which represents the number of calories your body needs at complete rest to maintain basic physiological functions like breathing, circulation, and cell production.
The calculator uses the Revised Harris-Benedict equations:
For Women: \[ BMR = 655 + (9.6 \times weight) + (1.8 \times height) - (4.7 \times age) \]
For Men: \[ BMR = 66 + (13.7 \times weight) + (5 \times height) - (6.8 \times age) \]
Where:
Explanation: The equation calculates the minimum energy expenditure required to sustain life while at complete rest.
Details: Knowing your BMR is essential for weight management, creating effective diet plans, and understanding your body's basic energy needs. It serves as the foundation for calculating total daily energy expenditure.
Tips: Enter weight in kilograms, height in centimeters, age in years, and select gender. All values must be valid (weight > 0, height > 0, age between 1-120).
Q1: What is the difference between BMR and RMR?
A: BMR (Basal Metabolic Rate) measures energy expenditure in a fasted, resting state under strict conditions, while RMR (Resting Metabolic Rate) is measured under less restrictive conditions and is typically slightly higher.
Q2: How accurate is the Harris-Benedict equation?
A: The equation provides a good estimate for most people but may be less accurate for extremely muscular or obese individuals. It's generally accurate within ±10% for the general population.
Q3: What factors affect BMR?
A: BMR is influenced by age, gender, body composition, genetics, thyroid function, and environmental temperature.
Q4: How often should I recalculate my BMR?
A: Recalculate whenever there are significant changes in weight, age, or body composition, typically every 3-6 months during weight loss/gain programs.
Q5: Can I use BMR for weight loss planning?
A: Yes, BMR is the starting point for calculating total daily energy needs. For weight loss, create a calorie deficit by consuming fewer calories than your total daily energy expenditure.