Calories At Rest Calculator

Harris-Benedict Equation (Men):

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

Weight:

Height:

Age:

years

Gender:

Basal Metabolic Rate (BMR):

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1. What is Basal Metabolic Rate (BMR)?

Basal Metabolic Rate (BMR) is the number of calories your body needs to perform basic life-sustaining functions at complete rest. This includes breathing, circulation, cell production, nutrient processing, and other essential bodily functions.

2. How Does the Calculator Work?

The calculator uses the Harris-Benedict equation:

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

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 estimates the minimum energy expenditure required to maintain vital body functions while at complete rest in a neutrally temperate environment.

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 serves as the foundation for calculating total daily energy expenditure (TDEE).

4. Using the Calculator

Tips: Enter your weight in kilograms, height in centimeters, age in years, and select your gender. For accurate results, use precise measurements and fast for 12 hours before calculation if possible.

5. Frequently Asked Questions (FAQ)

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

Q2: How accurate is the Harris-Benedict equation?
A: It's about 90% accurate for most people, but individual variations in muscle mass, body composition, and metabolic health can affect accuracy.

Q3: What factors affect BMR?
A: Age, gender, weight, height, body composition, genetics, hormonal status, and environmental temperature all influence BMR.

Q4: How can I increase my BMR?
A: Building muscle through strength training, staying hydrated, getting adequate sleep, and eating enough protein can help increase your metabolic rate.

Q5: Should I use BMR for weight loss planning?
A: Yes, BMR is the starting point for calculating your total daily energy needs. For weight loss, create a calorie deficit based on your TDEE (BMR × activity factor).