1. What is Basal Metabolic Rate?

Basal Metabolic Rate (BMR) is the number of calories your body needs to perform basic life-sustaining functions at rest. It represents the minimum energy required to maintain vital functions such as breathing, circulation, and cell production.

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
• +5 — Constant for men
• -161 — Constant for women

Explanation: This equation is considered the most accurate for estimating BMR in healthy individuals and accounts for differences in gender, age, weight, and height.

3. Importance of BMR Calculation

Details: Knowing your BMR is essential for creating effective weight management plans, whether for weight loss, maintenance, or gain. It helps determine your total daily energy expenditure when combined with activity level.

4. Using the Calculator

Tips: Enter your weight in kilograms, height in centimeters, age in years, and select your gender. All values must be valid (weight > 0, height > 0, age between 1-120).

5. Frequently Asked Questions (FAQ)

Q1: Why use Mifflin-St Jeor equation?
A: The Mifflin-St Jeor equation is considered the most accurate for estimating BMR in healthy individuals, with an accuracy rate of about 90%.

Q2: What factors affect BMR?
A: BMR is influenced by age, gender, weight, height, body composition, genetics, and hormonal factors.

Q3: How often should I calculate my BMR?
A: You should recalculate your BMR whenever your weight changes significantly (more than 5 kg) or annually as you age.

Q4: Can BMR change over time?
A: Yes, BMR typically decreases with age (about 1-2% per decade after age 20) and can be affected by changes in muscle mass and weight.

Q5: How does BMR relate to total daily calorie needs?
A: Total daily calorie needs are calculated by multiplying your BMR by an activity factor that represents your physical activity level.