1. What is the Mifflin-St Jeor Equation?

The Mifflin-St Jeor equation is considered the most accurate for estimating Basal Metabolic Rate (BMR) in healthy individuals. It provides an estimate of the calories your body needs at complete rest.

2. How Does the Calculator Work?

The calculator uses the Mifflin-St Jeor equation:

Where:

• \( weight \) — Weight in kilograms
• \( height \) — Height in centimeters
• \( age \) — Age in years
• \( s \) — +5 for males, -161 for females
• Activity Multiplier — 1.2 to 1.9 based on activity level

Explanation: The equation accounts for basic metabolic needs (BMR) which is then multiplied by an activity factor to estimate total daily calorie needs (TDEE).

3. Importance of TDEE Calculation

Details: Knowing your TDEE is essential for weight management, whether your goal is weight loss, maintenance, or muscle gain. It provides a scientific basis for setting calorie targets.

4. Using the Calculator

Tips: Enter weight in kg, height in cm, and age in years. Select your gender and most accurate activity level. All values must be valid (weight > 0, height > 0, age between 1-120).

5. Frequently Asked Questions (FAQ)

Q1: Why use Mifflin-St Jeor instead of Harris-Benedict?
A: The Mifflin-St Jeor equation is more accurate for modern populations, especially for obese individuals.

Q2: What are typical BMR values?
A: Average BMR is about 1500-2000 kcal/day for women and 1800-2500 kcal/day for men, but varies based on size and body composition.

Q3: How accurate is the activity multiplier?
A: Activity multipliers are estimates. For more precision, consider using activity trackers or consulting a dietitian.

Q4: Should I eat at my BMR or TDEE?
A: For weight loss, eat between BMR and TDEE. For maintenance, eat at TDEE. For gain, eat above TDEE.

Q5: Does this account for body composition?
A: The equation uses total weight. Those with more muscle mass may have slightly higher actual BMR than calculated.