1. What is the Mifflin-St Jeor Equation?

The Mifflin-St Jeor equation is a formula used to estimate Basal Metabolic Rate (BMR), which represents the number of calories your body needs at rest. When multiplied by an activity factor, it calculates Total Daily Energy Expenditure (TDEE) - the total calories you burn in a day.

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 multiplies it by your activity level to determine total daily energy expenditure.

3. Importance of TDEE Calculation

Details: Knowing your TDEE is essential for weight management - it helps determine appropriate calorie intake for weight loss, maintenance, or gain goals.

4. Using the Calculator

Tips: Enter accurate weight in kg, height in cm, age in years, and select your appropriate activity level. All values must be valid positive numbers.

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 people.

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).

Q3: Should I use this for weight loss planning?
A: Yes, TDEE calculation is fundamental for creating effective weight loss or weight gain plans by establishing your maintenance calorie level.

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

Q5: Are there limitations to this equation?
A: It may be less accurate for extremely muscular individuals, those with very high body fat percentages, or elderly populations.