1. What is the Mifflin-St Jeor Equation?

The Mifflin-St Jeor equation is a formula used to calculate 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 calculates the energy expenditure required to maintain vital body functions while at complete rest.

3. Importance of BMR Calculation

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

4. Using the Calculator

Tips: Enter your weight in kilograms, height in centimeters, age in years, and select your 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 in a fasting state under strict resting conditions, while RMR (Resting Metabolic Rate) is measured under less restrictive 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 individuals.

Q3: Does muscle mass affect BMR?
A: Yes, muscle tissue is more metabolically active than fat tissue. Individuals with more muscle mass typically have a higher BMR.

Q4: 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.

Q5: Can I use BMR for weight loss planning?
A: Yes, BMR is the starting point for calculating your total daily energy needs. For weight loss, you would typically create a calorie deficit based on your TDEE.