1. What is the James Smith TDEE Equation?

The James Smith TDEE equation calculates Total Daily Energy Expenditure based on the Mifflin-St Jeor formula with activity factor adjustments. It estimates the number of calories you burn daily based on your weight, height, age, and activity level.

2. How Does the Calculator Work?

The calculator uses the James Smith TDEE equation:

Where:

• \( weight \) — Body weight in kilograms (kg)
• \( height \) — Height in centimeters (cm)
• \( age \) — Age in years
• \( activity\ factor \) — Multiplier based on activity level

Explanation: The equation first calculates Basal Metabolic Rate (BMR) then multiplies by an activity factor to estimate total daily energy expenditure.

3. Importance of TDEE Calculation

Details: Knowing your TDEE is essential for weight management, whether your goal is weight loss, maintenance, or muscle gain. It helps determine appropriate calorie intake for your fitness objectives.

4. Using the Calculator

Tips: Enter your 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).

5. Frequently Asked Questions (FAQ)

Q1: What is TDEE?
A: TDEE stands for Total Daily Energy Expenditure - the total number of calories your body burns in a day, including basal metabolic rate and physical activity.

Q2: How accurate is this calculation?
A: This provides a good estimate for most people, but individual variations in metabolism may affect accuracy. It's best used as a starting point.

Q3: Should I use metric or imperial measurements?
A: This calculator uses metric measurements (kg for weight, cm for height) as it's designed for the UK market.

Q4: How often should I recalculate my TDEE?
A: Recalculate whenever your weight changes significantly (2-3 kg) or your activity level changes substantially.

Q5: Can this be used for weight loss planning?
A: Yes, subtract 300-500 calories from your TDEE for a moderate weight loss of 0.5-1kg per week.