1. What is the Mifflin-St Jeor Equation?

The Mifflin-St Jeor equation is currently considered the most accurate for estimating basal metabolic rate (BMR), which represents the number of calories your body needs at complete rest. It accounts for weight, height, age, and gender.

2. How Does the Calculator Work?

The calculator uses the Mifflin-St Jeor equation:

Where:

• \( W \) — Weight in kilograms
• \( H \) — Height in centimeters
• \( A \) — Age in years
• \( S \) — Sex adjustment (+5 for men, -161 for women)

Explanation: The equation calculates the energy (in kcal) your body needs to maintain basic physiological functions at rest.

3. Importance of BMR Calculation

Details: Knowing your BMR helps determine your total daily energy needs, which is essential for weight management, nutrition planning, and understanding metabolic health.

4. Using the Calculator

Tips: Enter weight in kg, height in cm, age in years, and select gender. For accurate results, measure weight and height precisely.

5. Frequently Asked Questions (FAQ)

Q1: How does BMR differ from TDEE?
A: BMR is calories burned at complete rest, while TDEE (Total Daily Energy Expenditure) includes activity and is typically higher.

Q2: Why is the equation different for men and women?
A: Men generally have more muscle mass and less body fat than women of the same weight, resulting in higher metabolic rates.

Q3: How accurate is the Mifflin-St Jeor equation?
A: It's about 70% accurate for most people, but individual variations in muscle mass, body composition, and genetics affect actual BMR.

Q4: Should I measure BMR in a fasted state?
A: For clinical measurement, yes. For estimation purposes, the equation accounts for typical variations.

Q5: How often should I recalculate my BMR?
A: Recalculate after significant weight changes (5+ kg) or annually as you age, since metabolism slows with age.