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 influenced by muscle mass, age, gender, and body size.

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
• \( +5 \) — Adjustment for male gender
• \( -161 \) — Adjustment for female gender

Explanation: The equation accounts for differences in body composition between genders and the natural decline in metabolism with age.

3. Importance of BMR Calculation

Details: Knowing your BMR helps create personalized nutrition plans for weight loss, maintenance, or muscle gain. It serves as the foundation for calculating total daily energy expenditure (TDEE).

4. Using the Calculator

Tips: For most accurate results, measure weight in the morning after using the bathroom and before eating. Height should be measured without shoes.

5. Frequently Asked Questions (FAQ)

Q1: How does muscle mass affect BMR?
A: Muscle tissue burns more calories at rest than fat tissue. Those with more muscle mass will have a higher BMR than those with the same weight but less muscle.

Q2: What are normal BMR values?
A: Typical BMR ranges are 1400-1800 kcal/day for women and 1600-2000 kcal/day for men, but vary based on size and body composition.

Q3: How often should I recalculate my BMR?
A: Recalculate after significant weight changes (5+ kg) or every 6 months as metabolism changes with age and body composition.

Q4: Does this account for activity level?
A: No, this is just basal metabolism. Multiply by an activity factor (1.2-1.9) to estimate total daily calorie needs.

Q5: Why is my BMR different from online calculators?
A: Different equations exist (Harris-Benedict, Katch-McArdle). Mifflin-St Jeor is considered most accurate for general population.