Daily Metabolic Rate Calculator Mayo Clinic

Mifflin-St Jeor Equation:

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

Weight:

Height:

Age:

years

Gender:

Basal Metabolic Rate (BMR):

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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). It's endorsed by the Mayo Clinic and provides an estimate of the 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:

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

Where:

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

Explanation: The equation accounts for the energy required to maintain vital body functions at complete rest, with different constants for men and women.

3. Importance of BMR Calculation

Details: Knowing your BMR is essential for weight management, as it represents the minimum calories needed to sustain basic bodily functions. This forms the foundation for determining total daily energy expenditure when combined with activity level.

4. Using the Calculator

Tips: Enter weight in kilograms, height in centimeters, age in years, and select your 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 more accurate than older equations like Harris-Benedict, especially for obese individuals, and is endorsed by major health organizations.

Q2: What factors can affect BMR?
A: BMR is influenced by body composition (muscle mass increases BMR), age (BMR decreases with age), genetics, hormonal factors, and environmental temperature.

Q3: How often should I recalculate my BMR?
A: You should recalculate your BMR every 3-6 months or whenever you experience significant changes in weight, muscle mass, or age.

Q4: Is BMR the same as total daily calorie needs?
A: No, BMR represents only the calories needed at complete rest. Total daily energy expenditure includes BMR plus calories burned through physical activity and digestion.

Q5: How accurate is this calculation?
A: While the Mifflin-St Jeor equation is among the most accurate predictive formulas, individual variations can occur. For precise measurements, clinical tests like indirect calorimetry may be needed.