Resting Calories Burned In A Day Calculator

Harris-Benedict Equation for Basal Metabolic Rate:

\[ BMR = 88.362 + (13.397 \times weight) + (4.799 \times height) - (5.677 \times age) \text{ (men)} \]

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Height:

Age:

years

Gender:

Basal Metabolic Rate (BMR):

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1. What is the Harris-Benedict Equation?

The Harris-Benedict equation estimates basal metabolic rate (BMR), which represents the number of calories your body burns at rest to maintain vital functions. It's one of the most widely used formulas for calculating resting energy expenditure.

2. How Does the Calculator Work?

The calculator uses the Harris-Benedict equation:

\[ BMR = 88.362 + (13.397 \times weight) + (4.799 \times height) - (5.677 \times age) \text{ (men)} \] \[ BMR = 447.593 + (9.247 \times weight) + (3.098 \times height) - (4.330 \times age) \text{ (women)} \]

Where:

\( weight \) — Body weight in kilograms (kg)
\( height \) — Height in centimeters (cm)
\( age \) — Age in years
Different coefficients apply for men and women

Explanation: The equation accounts for the fact that men typically have higher muscle mass and metabolic rates than women, and that metabolism slows with age.

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 when combined with activity level.

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). Use accurate measurements for best results.

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 state at complete rest, while RMR (Resting Metabolic Rate) is measured under less strict conditions and is typically slightly higher.

Q2: How accurate is the Harris-Benedict equation?
A: It's reasonably accurate for most healthy adults (±10-15%), but individual variations in muscle mass, body composition, and metabolic health can affect accuracy.

Q3: Why do men have higher BMR than women?
A: Men generally have more muscle mass, larger body size, and different hormonal profiles, all of which contribute to higher metabolic rates.

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

Q5: Can I use BMR for weight loss planning?
A: Yes, BMR helps determine your maintenance calories. For weight loss, create a calorie deficit by consuming fewer calories than your total daily energy expenditure (BMR × activity factor).