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 formulas 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

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 weight management plans, determining daily caloric needs, and establishing appropriate nutrition goals for maintaining, losing, or gaining weight.

4. Using the Calculator

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

5. Frequently Asked Questions (FAQ)

Q1: What is the difference between BMR and TDEE?
A: BMR (Basal Metabolic Rate) represents calories burned at complete rest, while TDEE (Total Daily Energy Expenditure) includes all daily activities and exercise.

Q2: How often should I recalculate my BMR?
A: You should recalculate your BMR whenever your weight changes significantly (typically 2-3 kg) or every few months to account for natural metabolic changes.

Q3: Does this equation work for everyone?
A: While the Mifflin-St Jeor Equation is accurate for most adults, it may be less accurate for extremely muscular individuals, athletes, or those with certain medical conditions affecting metabolism.

Q4: How can I use my BMR for weight management?
A: Multiply your BMR by an activity factor to determine your TDEE, then adjust your calorie intake based on whether you want to maintain, lose, or gain weight.

Q5: Why is there a constant of -161 in the formula?
A: The constant accounts for the average metabolic differences and is part of the equation's calibration to provide accurate BMR estimates for the general population.