1. What is the Mifflin-St Jeor Equation?

The Mifflin-St Jeor equation estimates resting metabolic rate (RMR), which represents the number of calories your body burns at rest to maintain basic physiological functions. It is considered one of the most accurate equations for RMR estimation in healthy adults.

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
• \( s \) — Gender adjustment factor (5 for men, -161 for women)

Explanation: The equation accounts for the basic metabolic needs based on body size, age, and gender differences in metabolic rate.

3. Importance of RMR Calculation

Details: Accurate RMR estimation is crucial for weight management, designing nutrition plans, determining daily caloric needs, and creating effective diet strategies for both weight loss and weight gain goals.

4. Using the Calculator

Tips: Enter weight in kilograms, height in centimeters, age in years, and select gender. All values must be valid (weight > 0, height > 0, age between 1-120).

5. Frequently Asked Questions (FAQ)

Q1: Why use Mifflin-St Jeor instead of other equations?
A: The Mifflin-St Jeor equation is considered more accurate than older equations like Harris-Benedict, especially for obese individuals, as it was developed using more modern measurement techniques.

Q2: What are normal RMR values?
A: Normal RMR varies by age, gender, weight, and height. Typically ranges from 1200-2000 kcal/day for women and 1500-2500 kcal/day for men, but individual variations exist.

Q3: How does RMR differ from BMR?
A: RMR (Resting Metabolic Rate) and BMR (Basal Metabolic Rate) are often used interchangeably, but BMR is measured under more strict conditions (complete rest, fasting, and thermoneutral environment).

Q4: Are there limitations to this equation?
A: The equation may be less accurate for extremely muscular individuals, those with very high or very low body fat percentages, elderly populations, and certain medical conditions affecting metabolism.

Q5: Should RMR be used for daily calorie needs?
A: RMR represents only basal metabolic needs. To determine total daily energy expenditure, you need to multiply RMR by an activity factor that accounts for your physical activity level.