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 rest to maintain basic physiological functions.

2. How Does the Calculator Work?

The calculator uses the Mifflin-St Jeor equation:

Where:

• \( Weight \) — Body weight in kilograms (kg)
• \( Height \) — Height in centimeters (cm)
• \( Age \) — Age in years
• +5 — Constant for males
• -161 — Constant for females

Explanation: The equation calculates the energy expenditure required to maintain vital body functions while at complete rest.

3. Importance of BMR Calculation

Details: Knowing your BMR is essential for weight management, creating effective diet plans, and understanding your body's energy requirements. It forms the basis for calculating total daily energy expenditure.

4. Using the Calculator

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

Q2: What factors can affect BMR?
A: BMR is influenced by age, gender, body composition, genetics, thyroid function, and environmental temperature.

Q3: How often should BMR be calculated?
A: Recalculate every 3-6 months or after significant weight changes (±5 kg) to ensure accuracy for diet planning.

Q4: Can BMR change over time?
A: Yes, BMR typically decreases with age due to loss of muscle mass and changes in hormonal balance.

Q5: How is BMR used for weight management?
A: BMR helps determine maintenance calories, which can then be adjusted for weight loss (deficit) or weight gain (surplus).