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Harris Benedict Equation:
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The Harris Benedict Equation is a formula used to estimate an individual's Basal Metabolic Rate (BMR) and Total Daily Energy Expenditure (TDEE). It provides a calculation of the number of calories your body needs to maintain basic physiological functions at rest.
The calculator uses the Harris Benedict equation:
Where BMR for men is calculated as: \[ BMR = 88.362 + (13.397 \times weight) + (4.799 \times height) - (5.677 \times age) \] And for women: \[ BMR = 447.593 + (9.247 \times weight) + (3.098 \times height) - (4.330 \times age) \]
Explanation: The equation accounts for basic metabolic needs based on weight, height, age, and gender, then multiplies by an activity factor to estimate total daily energy expenditure.
Details: Accurate TDEE estimation is crucial for weight management, nutrition planning, athletic training, and medical nutrition therapy. It helps determine appropriate calorie intake for weight loss, maintenance, or gain.
Tips: Enter weight in kilograms, height in centimeters, age in years, select gender and appropriate activity level. All values must be valid (weight > 0, height > 0, age between 1-120).
Q1: What's the difference between BMR and TDEE?
A: BMR (Basal Metabolic Rate) represents calories burned at complete rest, while TDEE (Total Daily Energy Expenditure) includes all daily activities and exercise.
Q2: How accurate is the Harris Benedict equation?
A: It provides a good estimate for most people, but individual variations in metabolism can affect accuracy. It's generally within 10-15% of actual energy expenditure.
Q3: Why are there different equations for men and women?
A: Men typically have more muscle mass and higher metabolic rates than women of the same weight, so different coefficients are used to account for these physiological differences.
Q4: How often should I recalculate my TDEE?
A: Recalculate whenever your weight changes significantly (5+ kg), or if your activity level changes substantially. Otherwise, every 3-6 months is reasonable.
Q5: Can this calculator be used for weight loss planning?
A: Yes, by creating a calorie deficit of 500-1000 kcal/day below your TDEE, you can achieve a safe weight loss of 0.5-1 kg per week.