1. What is the Mifflin-St Jeor Equation?

The Mifflin-St Jeor equation is considered one of the most accurate formulas for calculating basal metabolic rate (BMR) - the number of calories your body needs at complete rest to maintain basic physiological functions.

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

Explanation: This equation provides an estimate of your basal metabolic rate, which serves as the foundation for determining your total daily energy expenditure when combined with your activity level.

3. Importance of BMR Calculation for Fat Loss

Details: Knowing your BMR is crucial for effective fat loss planning. It helps determine your maintenance calories, from which you can create an appropriate calorie deficit for sustainable weight loss without compromising metabolic health.

4. Using the Calculator

Tips: Enter your current weight in kilograms, height in centimeters, and age in years. For accurate results, use precise measurements and ensure all values are valid (weight > 0, height > 0, age between 1-120).

5. Frequently Asked Questions (FAQ)

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

Q2: How do I use my BMR for fat loss?
A: Multiply your BMR by your activity level to get your Total Daily Energy Expenditure (TDEE), then create a calorie deficit of 300-500 calories below your TDEE for sustainable fat loss.

Q3: Does this equation work for everyone?
A: While accurate for most people, it may be less precise for extremely muscular individuals, those with very high body fat percentages, or athletes with exceptional metabolic rates.

Q4: Should I recalculate my BMR as I lose weight?
A: Yes, as you lose weight, your BMR decreases. It's recommended to recalculate every 4-6 weeks or after significant weight changes (5+ kg).

Q5: What's the difference between BMR and RMR?
A: BMR (Basal Metabolic Rate) measures energy expenditure at complete rest, while RMR (Resting Metabolic Rate) is typically slightly higher as it includes minimal daily activities. The terms are often used interchangeably in practice.