1. What is BMR?

Basal Metabolic Rate (BMR) is the number of calories your body needs to accomplish its most basic (basal) life-sustaining functions at complete rest. This includes breathing, circulation, cell production, nutrient processing, protein synthesis, and ion transport.

2. How Does the Calculator Work?

The calculator uses the Mifflin-St Jeor Equation:

Where:

• \( weight \) — Body weight in kilograms (kg)
• \( height \) — Height in centimeters (cm)
• \( age \) — Age in years
• \( gender\_factor \) — +5 for men, -161 for women

Explanation: The equation accounts for the fact that men typically have more muscle mass and therefore higher metabolic rates than women of the same weight.

3. Importance of BMR Calculation

Details: Knowing your BMR helps determine your daily calorie needs for weight maintenance, loss, or gain. It's the foundation for most calorie requirement calculations.

4. Using the Calculator

Tips: Enter weight in kg, height in cm, age in years, and select gender. For accurate results, measure weight in the morning before eating and after using the bathroom.

5. Frequently Asked Questions (FAQ)

Q1: How accurate is this BMR calculation?
A: The Mifflin-St Jeor Equation is considered the most accurate for estimating BMR in healthy individuals, with about 90% accuracy.

Q2: What's the difference between BMR and TDEE?
A: BMR is calories burned at complete rest, while Total Daily Energy Expenditure (TDEE) includes all daily activities and exercise.

Q3: Does muscle mass affect BMR?
A: Yes, muscle tissue burns more calories at rest than fat tissue. More muscular individuals will have higher BMRs.

Q4: How often should I recalculate my BMR?
A: Recalculate whenever your weight changes significantly (5+ kg) or annually as you age.

Q5: Why is my BMR lower than my friend's?
A: BMR varies based on body composition, gender, age, and genetics. Men typically have higher BMRs than women of the same weight.