1. What is the Mifflin-St Jeor 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 complete rest. TDEE (Total Daily Energy Expenditure) is calculated by multiplying BMR by an activity factor.

2. How Does the Calculator Work?

The calculator uses the Mifflin-St Jeor equation:

Where:

• \( weight \) — Body weight in kilograms
• \( height \) — Height in centimeters
• \( age \) — Age in years
• \( s \) — +5 for men, -161 for women
• \( factor \) — Activity multiplier (1.2-1.9)

Explanation: The equation accounts for basic metabolic needs based on body composition, with adjustments for gender and activity level.

3. Importance of BMR and TDEE Calculation

Details: Accurate BMR and TDEE calculation is crucial for weight management, nutrition planning, and understanding your body's energy requirements for maintaining, losing, or gaining weight.

4. Using the Calculator

Tips: Enter weight in kg, height in cm, age in years, select gender and 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 other equations?
A: The Mifflin-St Jeor equation is considered more accurate than older equations like Harris-Benedict, especially for obese individuals.

Q2: What are typical BMR values?
A: BMR typically ranges from 1200-2000 kcal/day for adults, varying based on age, gender, weight, and height.

Q3: How accurate are activity multipliers?
A: Activity multipliers provide estimates. Individual variations in metabolism and activity intensity can affect actual TDEE.

Q4: Should I use BMR or TDEE for weight loss?
A: For weight loss, use TDEE as it represents your total daily calorie needs including activity.

Q5: How often should I recalculate my BMR/TDEE?
A: Recalculate every 4-6 weeks if you're actively losing or gaining weight, as changes in weight affect your metabolic rate.