James Smith Calorie Calculator Tdee

Harris-Benedict Equation (James Smith):

\[ TDEE = (66.5 + 13.75 \times weight + 5.003 \times height - 6.755 \times age) \times activity\ factor \]

Weight:

Height:

Age:

years

Activity Factor:

Total Daily Energy Expenditure (TDEE):

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1. What is the James Smith TDEE Calculator?

The James Smith TDEE Calculator estimates your Total Daily Energy Expenditure using the Harris-Benedict equation. TDEE represents the total number of calories your body burns in a day, including basal metabolic rate and activity level.

2. How Does the Calculator Work?

The calculator uses the Harris-Benedict equation:

\[ TDEE = (66.5 + 13.75 \times weight + 5.003 \times height - 6.755 \times age) \times activity\ factor \]

Where:

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

Activity Factors:

Sedentary (little or no exercise): 1.2
Lightly Active (light exercise 1-3 days/week): 1.375
Moderately Active (moderate exercise 3-5 days/week): 1.55
Very Active (hard exercise 6-7 days/week): 1.725
Extra Active (very hard exercise, physical job): 1.9

3. Importance of TDEE Calculation

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

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 positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: Why use the Harris-Benedict equation?
A: The Harris-Benedict equation is a well-established and widely used formula for estimating basal metabolic rate, providing a solid foundation for TDEE calculation.

Q2: How accurate is this calculator?
A: While it provides a good estimate, individual variations in metabolism mean results may vary by ±10-15%. Use as a starting point and adjust based on results.

Q3: Should I use metric or imperial measurements?
A: This calculator uses metric measurements (kg for weight, cm for height) for consistency with the original equation.

Q4: How often should I recalculate my TDEE?
A: Recalculate every 4-6 weeks if your weight changes significantly, or if your activity level changes substantially.

Q5: Can this be used for weight loss planning?
A: Yes, subtract 300-500 calories from your TDEE for moderate weight loss, or 500-1000 calories for more aggressive weight loss, while ensuring you don't go below your BMR.