Resting Metabolic Rate Formula

Mifflin-St Jeor Equation:

\[ RMR = 10 \times Weight + 6.25 \times Height - 5 \times Age + 5 \text{ (men)} \text{ or } -161 \text{ (women)} \]

Weight:

Height:

Age:

years

Gender:

Resting Metabolic Rate (RMR):

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1. What Is The Resting Metabolic Rate Formula?

The Mifflin-St Jeor equation estimates resting metabolic rate (RMR) from weight, height, age, and gender. It provides a more accurate assessment of basal energy expenditure than older equations and is widely used in clinical practice.

2. How Does The Calculator Work?

The calculator uses the Mifflin-St Jeor equation:

\[ RMR = 10 \times Weight + 6.25 \times Height - 5 \times Age + 5 \text{ (men)} \text{ or } -161 \text{ (women)} \]

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 number of calories your body needs at complete rest to maintain basic physiological functions.

3. Importance Of RMR Calculation

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

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 equations?
A: The Mifflin-St Jeor equation is considered one of the most accurate RMR prediction equations for healthy individuals and is widely validated in research.

Q2: What are normal RMR values?
A: Normal RMR varies by age, gender, weight, and height. Typical ranges are 1200-2000 kcal/day for women and 1500-2500 kcal/day for men.

Q3: How does RMR differ from BMR?
A: RMR (Resting Metabolic Rate) and BMR (Basal Metabolic Rate) are often used interchangeably, but BMR is measured under more strict conditions while RMR is slightly higher and more practical for clinical use.

Q4: Are there limitations to this equation?
A: The equation may be less accurate for extremely muscular individuals, those with very high or very low body fat percentages, and certain medical conditions affecting metabolism.

Q5: Should this be used for athletic populations?
A: While useful as a baseline, athletes and highly active individuals may need additional adjustments to account for increased lean mass and metabolic adaptations.