1. What is the Mifflin-St Jeor Equation?

The Mifflin-St Jeor equation is a widely used formula for estimating Basal Metabolic Rate (BMR), which represents the number of calories your body needs at complete rest. When multiplied by an activity factor, it provides your Total Daily Energy Expenditure (TDEE).

2. How Does the Calculator Work?

The calculator uses the Mifflin-St Jeor equation:

Where:

• \( weight \) — Body weight in kilograms (kg)
• \( height \) — Height in centimeters (cm)
• \( age \) — Age in years
• \( activity\ factor \) — Multiplier based on physical activity level

Explanation: The equation calculates your basal metabolic rate first, then adjusts it based on your daily activity level to determine total energy expenditure.

3. Importance of TDEE Calculation

Details: Knowing your TDEE is essential for weight management, whether your goal is weight loss, maintenance, or muscle gain. It helps determine appropriate calorie intake for your specific needs and activity level.

4. Using the Calculator

Tips: Enter your weight in kg, height in cm, age in years, and select your activity level based on your typical weekly exercise routine. Use accurate measurements for best results.

5. Frequently Asked Questions (FAQ)

Q1: How accurate is the Mifflin-St Jeor equation?
A: It's considered one of the most accurate BMR equations for the general population, with an accuracy of about ±10% for most individuals.

Q2: What are the activity factor categories?
A: Sedentary (1.2), Lightly active (1.375), Moderately active (1.55), Very active (1.725), Extra active (1.9). Choose the category that best matches your weekly activity.

Q3: Should I use this for weight loss planning?
A: Yes, TDEE calculation is fundamental for creating effective weight loss plans. Subtract 500 calories from your TDEE for approximately 0.5kg weight loss per week.

Q4: How often should I recalculate my TDEE?
A: Recalculate whenever your weight changes significantly (±5kg) or your activity level changes substantially.

Q5: Are there limitations to this calculation?
A: The equation may be less accurate for extremely muscular individuals, those with very high body fat percentages, or people with certain medical conditions affecting metabolism.