1. What is the BMR Equation?

The BMR (Basal Metabolic Rate) equation estimates the number of calories your body needs to maintain basic physiological functions at rest. It accounts for weight, height, age, and gender.

2. How Does the Calculator Work?

The calculator uses the BMR 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 estimates energy expenditure based on body size (weight and height), age-related metabolic changes, and gender differences.

3. Importance of BMR Calculation

Details: Knowing your BMR helps determine 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. All values must be valid (weight > 0, height > 0, age between 1-120).

5. Frequently Asked Questions (FAQ)

Q1: What's the difference between BMR and TDEE?
A: BMR is calories burned at complete rest, while TDEE (Total Daily Energy Expenditure) includes activity and is typically 1.2-2.5× BMR.

Q2: How accurate is this BMR formula?
A: It provides a good estimate for most people, but individual variations in muscle mass and metabolism can affect accuracy by ±10-15%.

Q3: Why does gender affect BMR?
A: Men typically have more muscle mass and less body fat than women of the same weight, resulting in higher metabolic rates.

Q4: Should I measure weight with or without clothes?
A: For most accuracy, measure nude weight in the morning after using the bathroom and before eating/drinking.

Q5: How often should I recalculate my BMR?
A: Recalculate after significant weight changes (±5 kg) or every 6 months as metabolism changes with age.