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

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
• +5 — Additional calories for men
• -161 — Adjustment for women

Explanation: The equation accounts for the fact that men typically have higher metabolic rates than women due to differences in body composition and muscle mass.

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.

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: What is the difference between BMR and RMR?
A: BMR (Basal Metabolic Rate) measures energy expenditure at complete rest, while RMR (Resting Metabolic Rate) is measured under less strict conditions and is typically slightly higher.

Q2: How accurate is the Mifflin-St Jeor equation?
A: It's considered one of the most accurate equations for estimating BMR in healthy adults, with an accuracy of about ±10% for most populations.

Q3: Why are there different equations for men and women?
A: Men generally have more muscle mass and less body fat than women, which results in a higher metabolic rate. The equation accounts for these physiological differences.

Q4: How often should I recalculate my BMR?
A: You should recalculate your BMR whenever there are significant changes in your weight, body composition, or age (typically every few months or after substantial weight changes).

Q5: Can this calculator be used for athletes?
A: While the equation works for most populations, highly trained athletes with exceptional muscle mass may find it underestimates their actual BMR due to their elevated muscle tissue.