1. What is Basal Metabolic Rate (BMR)?

Definition: BMR is the number of calories your body needs to maintain basic physiological functions at rest.

Purpose: It helps in weight management, diet planning, and understanding your body's energy requirements.

2. How Does the BMR Calculator Work?

The calculator uses the Mifflin-St Jeor formula:

Where:

• \( BMR \) — Basal Metabolic Rate (kcal/day)
• \( W \) — Weight (kg)
• \( H \) — Height (cm)
• \( A \) — Age (years)
• \( S \) — Sex adjustment (+5 for men, -161 for women)

Explanation: This formula accounts for body size, age, and sex differences in metabolic rate.

3. Importance of BMR Calculation

Details: Knowing your BMR helps create personalized nutrition plans and understand your body's energy needs.

4. Using the Calculator

Tips: Enter your weight in kg, height in cm, age in years, and select your sex. All values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: Why are there different formulas for men and women?
A: Biological differences in body composition mean women typically have a lower BMR than men of the same size and age.

Q2: How accurate is this calculation?
A: The Mifflin-St Jeor formula is about 90% accurate for most people, but individual variations exist.

Q3: Does this include activity calories?
A: No, this is just your basal metabolic rate. You'll need to multiply by an activity factor for total daily energy expenditure.

Q4: Why does age affect BMR?
A: Metabolism naturally slows with age due to muscle loss and hormonal changes.

Q5: How often should I recalculate my BMR?
A: Recalculate after significant weight changes (5+ kg) or annually as you age.