1. What is TDEE and BMR?

BMR (Basal Metabolic Rate) is the number of calories your body needs at complete rest to maintain basic functions like breathing and circulation. TDEE (Total Daily Energy Expenditure) is the total number of calories you burn each day, including physical activity.

2. How Does the Calculator Work?

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

Where \( s \) is +5 for men and -161 for women.

Then calculates TDEE:

3. Importance of TDEE Calculation

Details: Knowing your TDEE helps with weight management - consuming fewer calories than your TDEE leads to weight loss, while consuming more leads to weight gain.

4. Using the Calculator

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

5. Frequently Asked Questions (FAQ)

Q1: How accurate is this calculator?
A: It provides a good estimate for most people, but individual variations in metabolism can affect actual energy expenditure.

Q2: What are typical BMR values?
A: Average BMR is about 1500-2000 kcal/day for women and 1800-2500 kcal/day for men, but varies with body size and composition.

Q3: Should I use my TDEE for weight loss?
A: For weight loss, consume 300-500 kcal less than your TDEE. For weight gain, consume 300-500 kcal more.

Q4: How often should I recalculate my TDEE?
A: Recalculate when your weight changes significantly (5+ kg) or your activity level changes substantially.

Q5: Why does BMR decrease with age?
A: Muscle mass typically decreases with age, and muscle is more metabolically active than fat.