1. What is the Mifflin-St Jeor BMR Equation?

The Mifflin-St Jeor equation is considered one of the most accurate formulas for calculating Basal Metabolic Rate (BMR), which represents the number of calories your body needs at rest to maintain basic physiological functions.

2. How Does the Calculator Work?

The calculator uses the Mifflin-St Jeor equation:

Where:

• \( BMR \) — Basal Metabolic Rate (kcal/day)
• \( F \) — Body fat percentage (expressed as decimal)
• \( W \) — Weight in kilograms (kg)

Explanation: This equation accounts for lean body mass by factoring in body fat percentage, providing a more accurate estimate of resting metabolic rate.

3. Importance of BMR Calculation

Details: Knowing your BMR is essential for creating effective nutrition plans, weight management strategies, and understanding your body's basic energy requirements.

4. Using the Calculator

Tips: Enter your weight in kilograms and body fat percentage. Ensure values are valid (weight > 0, body fat between 0-100%).

5. Frequently Asked Questions (FAQ)

Q1: Why is Mifflin-St Jeor considered the most accurate?
A: Multiple studies have shown that the Mifflin-St Jeor equation provides the most accurate BMR estimation compared to other formulas, with an accuracy rate of about 70-80%.

Q2: How often should I recalculate my BMR?
A: You should recalculate your BMR whenever there are significant changes in your weight (5+ kg) or body composition.

Q3: What factors can affect BMR?
A: Age, gender, body composition, genetics, hormone levels, and environmental temperature can all influence your basal metabolic rate.

Q4: How accurate is body fat percentage measurement?
A: The accuracy varies by method. DEXA scans are most accurate, while bioelectrical impedance scales provide reasonable estimates for most purposes.

Q5: Should I use BMR or TDEE for calorie planning?
A: For weight management, use Total Daily Energy Expenditure (TDEE) which includes BMR plus activity calories. BMR represents only your resting metabolic needs.