1. What is the Mifflin-St Jeor Equation?

The Mifflin-St Jeor equation is a widely used formula for estimating basal metabolic rate (BMR) and calculating daily calorie needs. It's considered one of the most accurate equations for estimating energy expenditure in healthy individuals.

2. How Does the Calculator Work?

The calculator uses the Mifflin-St Jeor equation for men:

Where:

• \( weight \) — Body weight in kilograms (kg)
• \( height \) — Height in centimeters (cm)
• \( age \) — Age in years

Explanation: This equation calculates your Basal Metabolic Rate (BMR) - the number of calories your body needs at complete rest. To get your total daily energy expenditure, you would multiply this result by an activity factor.

3. Importance of Calorie Calculation

Details: Accurate calorie estimation is crucial for weight management, whether your goal is weight loss, maintenance, or gain. Understanding your baseline calorie needs helps create effective nutrition plans.

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: Is this calculation accurate for everyone?
A: While the Mifflin-St Jeor equation is generally accurate for most people, individual variations in metabolism, body composition, and health conditions can affect actual calorie needs.

Q2: Does this account for physical activity?
A: No, this calculation provides your Basal Metabolic Rate (BMR). To estimate total daily calories, multiply this result by an activity factor (sedentary: 1.2, light activity: 1.375, moderate: 1.55, very active: 1.725, extra active: 1.9).

Q3: How often should I recalculate my calorie needs?
A: You should recalculate whenever your weight changes significantly (5+ kg), or if your activity level changes substantially.

Q4: Are there limitations to this equation?
A: This equation may be less accurate for extremely muscular individuals, those with very high body fat percentages, elderly populations, and certain medical conditions affecting metabolism.

Q5: Should I use this calculation for weight loss?
A: This calculation provides a starting point. For weight loss, typically you would subtract 500-1000 calories from your maintenance level, but it's best to consult with a healthcare professional for personalized advice.