1. What Are BMI and TDEE?

BMI (Body Mass Index) is a measure of body fat based on height and weight. TDEE (Total Daily Energy Expenditure) estimates the number of calories you burn per day, including physical activity.

2. How Does the Calculator Work?

The calculator uses the following formulas:

Where:

• \( weight \) — Weight in kilograms (kg)
• \( height_m \) — Height in meters (m)
• \( height \) — Height in centimeters (cm)
• \( age \) — Age in years
• \( activity\_factor \) — Multiplier based on activity level

Explanation: BMI provides a simple numeric measure of body fatness, while TDEE estimates total daily calorie needs based on basal metabolic rate and activity level.

3. Importance of BMI and TDEE Calculation

Details: BMI helps assess weight categories and potential health risks. TDEE is crucial for weight management, helping determine appropriate calorie intake for weight loss, maintenance, or gain.

4. Using the Calculator

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

5. Frequently Asked Questions (FAQ)

Q1: What are the BMI categories?
A: Underweight (<18.5), Normal (18.5-24.9), Overweight (25-29.9), Obesity (≥30).

Q2: How accurate is the TDEE calculation?
A: It provides a good estimate but individual variations exist due to metabolism, body composition, and other factors.

Q3: Should I use this for weight loss planning?
A: Yes, TDEE helps determine maintenance calories. Subtract 500 kcal/day for approximately 0.5kg weight loss per week.

Q4: Are there limitations to BMI?
A: BMI doesn't distinguish between muscle and fat, so it may not accurately reflect body composition in athletes or elderly.

Q5: How often should I recalculate TDEE?
A: Recalculate when your weight changes significantly (±5kg) or your activity level changes substantially.