Calorie Calculator Mifflin St Jeor Equation

Mifflin-St Jeor Equation:

\[ Calories = (10 \times weight + 6.25 \times height - 5 \times age - 161) \times activity\ factor \]

Weight:

Height:

Age:

years

Activity Factor:

Estimated Calories:

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1. What is the Mifflin-St Jeor Equation?

The Mifflin-St Jeor equation is a widely used formula for estimating basal metabolic rate (BMR) and total daily energy expenditure (TDEE). It provides a more accurate assessment of calorie needs than older equations, especially for different body compositions.

2. How Does the Calculator Work?

The calculator uses the Mifflin-St Jeor equation:

\[ Calories = (10 \times weight + 6.25 \times height - 5 \times age - 161) \times activity\ factor \]

Where:

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

Explanation: The equation calculates basal metabolic rate and then multiplies by an activity factor to estimate total daily calorie needs.

3. Importance of Calorie Calculation

Details: Accurate calorie estimation is crucial for weight management, athletic performance, medical nutrition therapy, and designing appropriate diet plans for different health goals.

4. Using the Calculator

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

5. Frequently Asked Questions (FAQ)

Q1: Why use Mifflin-St Jeor instead of other equations?
A: Mifflin-St Jeor is considered more accurate than older equations like Harris-Benedict, especially for different body compositions and modern populations.

Q2: What are typical calorie needs?
A: Calorie needs vary widely but typically range from 1600-3000 kcal/day for adults, depending on age, gender, weight, height, and activity level.

Q3: How accurate is this calculation?
A: While more accurate than many equations, this is still an estimate. Individual variations in metabolism can cause actual needs to differ by ±10-15%.

Q4: Should this be used for weight loss planning?
A: Yes, but it's recommended to adjust based on individual response and consult with a healthcare professional for personalized advice.

Q5: Are there limitations to this equation?
A: Less accurate for extremely muscular individuals, those with very high body fat percentages, pregnant women, and certain medical conditions.