1. What is TDEE Calculation?

TDEE (Total Daily Energy Expenditure) represents the total number of calories you burn in a day, including basal metabolic rate (BMR) and physical activity. It's calculated using the Harris-Benedict equation for BMR multiplied by an activity factor.

2. How Does the Calculator Work?

The calculator uses the Harris-Benedict equation and activity multiplier:

Where BMR is calculated as:

• For men: BMR = 88.362 + (13.397 × weight in kg) + (4.799 × height in cm) - (5.677 × age in years)
• For women: BMR = 447.593 + (9.247 × weight in kg) + (3.098 × height in cm) - (4.330 × age in years)

Activity Factors:

• Sedentary (little or no exercise): 1.2
• Lightly active (light exercise 1-3 days/week): 1.375
• Moderately active (moderate exercise 3-5 days/week): 1.55
• Very active (hard exercise 6-7 days/week): 1.725
• Extra active (very hard exercise & physical job): 1.9

3. Importance of TDEE Calculation

Details: Knowing your TDEE is essential for weight management, whether you want to lose, maintain, or gain weight. It helps determine appropriate calorie intake for your goals.

4. Using the Calculator

Tips: Enter your weight in kg, height in cm, age in years, select gender and activity level. All values must be valid (weight > 0, height > 0, age between 1-120).

5. Frequently Asked Questions (FAQ)

Q1: What is the difference between BMR and TDEE?
A: BMR (Basal Metabolic Rate) is the calories your body needs at complete rest, while TDEE 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 exist. For precise measurements, professional metabolic testing is recommended.

Q3: Should I use metric or imperial measurements?
A: This calculator uses metric measurements (kg for weight, cm for height) as per the original Harris-Benedict equation.

Q4: How often should I recalculate my TDEE?
A: Recalculate when your weight changes significantly (±5kg), activity level changes, or every 6 months as metabolism changes with age.

Q5: Can this calculator be used for weight loss?
A: Yes, subtract 500-1000 calories from your TDEE for a safe weight loss of 0.5-1kg per week, but never go below 1200 calories for women or 1500 for men.