1. What is BMR?

Basal Metabolic Rate (BMR) is the number of calories your body needs to accomplish its most basic (basal) 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 Equation for women:

Where:

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

Explanation: The equation estimates the calories your body needs to function at complete rest, accounting for your size, age, and gender.

3. Importance of BMR Calculation

Details: Knowing your BMR helps determine your total daily energy expenditure (TDEE) when combined with your activity level. This is essential for weight management, whether your goal is weight loss, maintenance, or gain.

4. Using the Calculator

Tips: Enter your weight in kg, height in cm, and age in years. For accurate results, measure your weight and height in the morning before eating.

5. Frequently Asked Questions (FAQ)

Q1: How accurate is the BMR calculation?
A: The Mifflin-St Jeor equation is about 70% accurate for most people. For greater accuracy, indirect calorimetry can measure exact oxygen consumption.

Q2: What's the difference between BMR and TDEE?
A: BMR is calories burned at complete rest. TDEE (Total Daily Energy Expenditure) includes all daily activities and is calculated by multiplying BMR by an activity factor.

Q3: Why does BMR decrease with age?
A: Muscle mass typically decreases with age while fat increases. Since muscle burns more calories than fat at rest, BMR declines.

Q4: How often should I recalculate my BMR?
A: Recalculate after significant weight changes (±5 kg) or every 6 months due to natural metabolic changes.

Q5: Can men use this calculator?
A: This calculator uses the women's equation. Men should use: BMR = 10×weight + 6.25×height - 5×age + 5.