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 rest to maintain basic physiological functions. It's considered one of the most accurate BMR equations for the general population.

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
• 161 — Constant adjustment factor

Explanation: This equation calculates the minimum energy expenditure required to sustain vital functions while at complete rest.

3. Importance of BMR Calculation

Details: Knowing your BMR is essential for creating effective nutrition plans, weight management strategies, and understanding your body's basic energy requirements. It forms the foundation for calculating Total Daily Energy Expenditure (TDEE).

4. Using the Calculator

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

5. Frequently Asked Questions (FAQ)

Q1: What is the difference between BMR and RMR?
A: BMR (Basal Metabolic Rate) measures energy expenditure at complete rest, while RMR (Resting Metabolic Rate) measures energy expenditure at rest but may include minimal activity. BMR is typically slightly lower than RMR.

Q2: 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.

Q3: Why is BMR important for weight management?
A: BMR represents 60-75% of total daily energy expenditure. Knowing your BMR helps create appropriate calorie targets for weight loss, maintenance, or gain.

Q4: Does this equation work for everyone?
A: While accurate for most, it may be less precise for extremely muscular individuals, those with very high or very low body fat percentages, or certain medical conditions.

Q5: How often should I recalculate my BMR?
A: Recalculate when your weight changes significantly (5+ kg), or annually as age affects metabolic rate. Regular updates ensure accurate calorie planning.