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). BMR represents the number of calories your body needs to perform basic life-sustaining functions at rest.

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
• Gender — Biological sex (different coefficients for men and women)

Explanation: The equation accounts for the fact that men typically have higher muscle mass and metabolic rates than women, and that metabolism slows with age.

3. Importance of BMR Calculation

Details: Knowing your BMR is essential for creating effective weight management plans, whether for weight loss, maintenance, or gain. It forms the foundation for calculating total daily energy expenditure when combined with activity level.

4. Using the Calculator

Tips: Enter your weight in kilograms, height in centimeters, age in years, and select your gender. Use accurate measurements for the most precise results. 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 BMR formulas?
A: The Mifflin-St Jeor equation is considered more accurate than older formulas like Harris-Benedict, especially for obese individuals, as it was developed using more modern research methods.

Q2: What is a normal BMR range?
A: BMR varies significantly based on age, gender, weight, and height. Typically, men have BMRs between 1600-2000 kcal/day, while women range between 1300-1600 kcal/day.

Q3: How often should I recalculate my BMR?
A: You should recalculate your BMR whenever your weight changes significantly (5+ kg), or annually as you age, since metabolism slows with age.

Q4: Does muscle mass affect BMR?
A: Yes, muscle tissue burns more calories at rest than fat tissue. Individuals with higher muscle mass will have higher BMRs than those with the same weight but higher body fat percentage.

Q5: How do I use BMR for weight management?
A: Multiply your BMR by an activity factor to get your total daily energy expenditure (TDEE). To lose weight, consume fewer calories than your TDEE; to gain weight, consume more.