1. What is BMR and BMI?

BMR (Basal Metabolic Rate) is the number of calories your body needs at complete rest to maintain basic functions like breathing and circulation. BMI (Body Mass Index) is a measure of body fat based on height and weight.

2. How Does the Calculator Work?

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

And the standard BMI formula:

Where:

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

3. Importance of BMR and BMI

Details: BMR helps estimate daily calorie needs for weight maintenance, loss, or gain. BMI provides a quick assessment of weight status (underweight, normal, overweight, obese).

4. Using the Calculator

Tips: Enter weight in kg, height in cm, and age in years. 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 rest. TDEE (Total Daily Energy Expenditure) includes activity and is typically 1.2-2.5× BMR depending on activity level.

Q2: What are normal BMI values?
A: Underweight (<18.5), Normal (18.5-24.9), Overweight (25-29.9), Obese (≥30).

Q3: How accurate is BMR calculation?
A: The equation estimates average needs. Individual variations exist due to muscle mass, genetics, and other factors.

Q4: Are there limitations to BMI?
A: BMI doesn't distinguish between muscle and fat. Athletes may have high BMI without excess fat.

Q5: Should this be used during pregnancy?
A: No, the equations aren't valid for pregnant women who have different metabolic needs.