How To Calculate Resting Calories

Harris Benedict BMR Calculator

Harris-Benedict Equation for 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):

Unit Converter ▲

Unit Converter ▼

From:	To:

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:

For Men: \[ BMR = 88.362 + (13.397 \times Weight) + (4.799 \times Height) - (5.677 \times Age) \]

For Women: \[ BMR = 447.593 + (9.247 \times Weight) + (3.098 \times Height) - (4.330 \times Age) \]

Where:

\( Weight \) — Body weight in kilograms (kg)
\( Height \) — Height in centimeters (cm)
\( Age \) — Age in years

Explanation: The equation estimates the minimum energy expenditure required to maintain vital 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 requirements. 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 input values in the correct units.

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 laboratory 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 generally accurate within ±10% for most people, but individual variations in muscle mass, body composition, and metabolic health can affect accuracy.

Q3: How often does BMR change?
A: BMR decreases with age (about 1-2% per decade after age 20) and changes with weight fluctuations, muscle mass changes, and hormonal variations.

Q4: Can I increase my BMR?
A: Yes, through regular exercise (especially strength training), building muscle mass, proper nutrition, adequate sleep, and staying hydrated.

Q5: How do I use BMR for weight loss?
A: Calculate your TDEE by multiplying BMR by your activity level factor, then create a calorie deficit (typically 300-500 calories below TDEE) for gradual weight loss.