Calories Burned At Rest Calculator

Mifflin-St Jeor Equation:

\[ BMR = 10 \times weight_{kg} + 6.25 \times height_{cm} - 5 \times age + 5 \text{ (men)} \]

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 estimates basal metabolic rate (BMR) - the number of calories your body burns at rest to maintain vital functions. It is considered one of the most accurate BMR formulas available for healthy individuals.

2. How Does the Calculator Work?

The calculator uses the Mifflin-St Jeor equation:

\[ BMR = 10 \times weight_{kg} + 6.25 \times height_{cm} - 5 \times age + 5 \text{ (men)} \] \[ BMR = 10 \times weight_{kg} + 6.25 \times height_{cm} - 5 \times age - 161 \text{ (women)} \]

Where:

\( weight_{kg} \) — Body weight in kilograms
\( height_{cm} \) — Height in centimeters
\( age \) — Age in years
+5 — Male constant adjustment
-161 — Female constant adjustment

Explanation: The equation calculates the minimum energy required to sustain basic physiological 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 needs. It forms the foundation for calculating total daily energy expenditure (TDEE).

4. Using the Calculator

Tips: Enter weight in kilograms, height in centimeters, age in years, and select gender. For accurate results, use current measurements and fasted morning weight if possible.

5. Frequently Asked Questions (FAQ)

Q1: What is the difference between BMR and RMR?
A: BMR (Basal Metabolic Rate) measures energy expenditure in a fasting, rested state, while RMR (Resting Metabolic Rate) is measured under less strict conditions. BMR is typically slightly lower than RMR.

Q2: How accurate is the Mifflin-St Jeor equation?
A: It is approximately 90% accurate for most healthy individuals, making it one of the most reliable BMR prediction formulas available.

Q3: What factors can affect BMR?
A: Age, gender, body composition, genetics, thyroid function, and environmental temperature can all influence BMR. Muscle mass increases BMR while fat mass has less effect.

Q4: How often should I recalculate my BMR?
A: Recalculate every 3-6 months, or whenever you experience significant weight changes (5+ kg) or lifestyle modifications.

Q5: Can I use BMR for weight loss planning?
A: Yes, BMR is the starting point for determining your total daily calorie needs. For weight loss, create a calorie deficit below your total daily energy expenditure.