Harris-Benedict Equation:
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The Harris-Benedict Equation is a method used to estimate an individual's basal metabolic rate (BMR), which represents the number of calories your body needs to perform basic life-sustaining functions at rest. It was first published in 1918 and revised in 1984.
The calculator uses the Harris-Benedict equation:
Where:
Explanation: The equation calculates the basal energy expenditure (BEE) which represents the calories needed for basic bodily functions at complete rest.
Details: Knowing your basal metabolic rate is essential for weight management, nutritional planning, and determining appropriate caloric intake for maintaining, losing, or gaining weight.
Tips: Enter your weight in kg, height in cm, age in years, and select your gender. All values must be valid (weight > 0, height > 0, age between 1-120).
Q1: How accurate is the Harris-Benedict equation?
A: While widely used, it may overestimate BMR by about 5-15% in various populations. It serves as a good starting point but may need adjustment based on individual factors.
Q2: What's the difference between BMR and BEE?
A: Basal Metabolic Rate (BMR) and Basal Energy Expenditure (BEE) are essentially the same measurement, representing the calories burned at complete rest.
Q3: Should I use metric or imperial measurements?
A: This calculator uses metric measurements (kg for weight, cm for height) as the equation was designed with these units.
Q4: How does activity level affect my total calorie needs?
A: The BEE result represents calories at complete rest. To estimate total daily energy expenditure, multiply BEE by an activity factor (sedentary: 1.2, light activity: 1.375, moderate: 1.55, very active: 1.725, extra active: 1.9).
Q5: Are there limitations to this equation?
A: The equation may be less accurate for extremely muscular individuals, those with very high body fat percentages, elderly populations, and certain ethnic groups.