1. What is Basal Metabolic Rate (BMR)?

Basal Metabolic Rate (BMR) is the number of calories your body needs to perform basic life-sustaining functions at rest. This includes breathing, circulation, cell production, and nutrient processing.

2. How Does the Calculator Work?

The calculator uses the Mifflin-St Jeor BMR equation:

Where:

• \( weight \) — Body weight in kilograms (kg)
• \( height \) — Height in centimeters (cm)
• \( age \) — Age in years
• +5 — Additional calories for men
• -161 — Adjustment for women

Explanation: This equation provides an estimate of the calories your body burns at complete rest, accounting for differences in gender due to varying body composition.

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 serves as the foundation for calculating your total daily energy expenditure (TDEE).

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: What's the difference between BMR and TDEE?
A: BMR is calories burned at complete rest, while TDEE (Total Daily Energy Expenditure) includes all activities and is calculated by multiplying BMR by an activity factor.

Q2: How accurate is this BMR calculation?
A: The Mifflin-St Jeor equation is considered one of the most accurate BMR formulas for the general population, with about 80-90% accuracy.

Q3: Does muscle mass affect BMR?
A: Yes, muscle tissue burns more calories at rest than fat tissue. Individuals with higher muscle mass typically have a higher BMR.

Q4: How often should I recalculate my BMR?
A: Recalculate whenever you experience significant weight changes (±5kg) or every 6-12 months as part of regular health assessment.

Q5: Can BMR change with age?
A: Yes, BMR typically decreases with age due to loss of muscle mass and changes in hormonal balance, decreasing by about 1-2% per decade after age 20.