1. What is BMR?

Basal Metabolic Rate (BMR) is the number of calories your body needs to maintain basic physiological functions at rest. It accounts for 60-75% of daily calorie expenditure and is crucial for weight management.

2. How Does the Calculator Work?

The calculator uses the Mifflin-St Jeor Equation:

Where:

• \( weight \) — Body weight in kilograms
• \( height \) — Height in centimeters
• \( age \) — Age in years
• 5 — Constant for men
• -161 — Constant for women

3. Importance of BMR Calculation

Details: Knowing your BMR helps determine daily calorie needs for weight maintenance, loss, or gain. Combined with BMI, it provides a comprehensive view of metabolic health.

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 after bathroom use and before eating.

5. Frequently Asked Questions (FAQ)

Q1: How accurate is this BMR calculation?
A: The Mifflin-St Jeor equation is about 90% accurate for most people, more precise than older equations like Harris-Benedict.

Q2: What's the difference between BMR and TDEE?
A: BMR is calories burned at complete rest. TDEE (Total Daily Energy Expenditure) includes activity and is typically 1.2-2.5× BMR.

Q3: Does muscle mass affect BMR?
A: Yes, muscle burns more calories at rest than fat. Athletes may have higher BMR than the equation predicts.

Q4: How often should I recalculate my BMR?
A: Recalculate after significant weight changes (±5 kg) or annually as metabolism slows with age.

Q5: Why is BMI included?
A: BMI provides context for BMR - those with higher BMI may have different calorie needs per kg than those with normal BMI.