1. What is BMR?

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 keep your body functioning, including breathing, circulation, and cell production.

2. How Does the Calculator Work?

The calculator uses the Mifflin-St Jeor equation for BMR:

Where:

• \( weight \) — Body weight in kilograms (kg)
• \( height \) — Height in centimeters (cm)
• \( age \) — Age in years

TDEE Calculation: The Total Daily Energy Expenditure is calculated by multiplying BMR by an activity multiplier:

• Sedentary (little or no exercise): BMR × 1.2
• Light (exercise 1-3 days/week): BMR × 1.375
• Moderate (exercise 3-5 days/week): BMR × 1.55
• Active (exercise 6-7 days/week): BMR × 1.725
• Very Active (hard exercise daily): BMR × 1.9

3. Importance of BMR Calculation

Details: Knowing your BMR and TDEE is essential for weight management, whether you want to lose, maintain, or gain weight. It helps determine your daily calorie needs for achieving your fitness goals.

4. Using the Calculator

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

5. Frequently Asked Questions (FAQ)

Q1: Why use the Mifflin-St Jeor equation?
A: The Mifflin-St Jeor equation is considered one of the most accurate BMR formulas for the general population and is widely used by healthcare professionals.

Q2: What factors affect BMR?
A: BMR is influenced by age, gender, weight, height, body composition, and genetic factors. Muscle mass increases BMR while fat decreases it.

Q3: How often should I recalculate my BMR?
A: You should recalculate your BMR every 3-6 months or whenever you experience significant weight changes (±5 kg).

Q4: Can BMR change over time?
A: Yes, BMR typically decreases with age (about 1-2% per decade after age 20) and can be increased through strength training and building muscle mass.

Q5: Is this calculator accurate for athletes?
A: While generally accurate, highly trained athletes may have different metabolic rates. For precise calculations, professional metabolic testing is recommended.