1. What is the Mifflin-St Jeor Equation?

The Mifflin-St Jeor equation is a widely used formula for estimating resting energy expenditure (REE), which represents the number of calories your body needs at complete 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
• \( s \) — Gender coefficient: +5 for men, -161 for women

Explanation: The equation calculates basal metabolic rate based on body size, age, and gender, providing an estimate of daily calorie needs at rest.

3. Importance of REE Calculation

Details: Accurate REE estimation is crucial for weight management, nutritional planning, and determining appropriate calorie intake for weight loss, maintenance, or gain goals.

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: How accurate is the Mifflin-St Jeor equation?
A: It's considered one of the most accurate equations for estimating REE in healthy adults, with an accuracy of about ±10% for most populations.

Q2: Should I use this for total daily energy expenditure?
A: This calculates resting expenditure only. Multiply by an activity factor (1.2-2.5) to estimate total daily energy needs.

Q3: Does this work for athletes?
A: While generally accurate, highly trained athletes may have different metabolic rates. Consider body composition for more precise estimates.

Q4: How does age affect REE?
A: REE typically decreases by about 1-2% per decade after age 20 due to loss of muscle mass and metabolic changes.

Q5: Are there limitations to this equation?
A: Less accurate for extremely obese individuals, pregnant women, and those with certain medical conditions affecting metabolism.