1. What is the Mifflin-St Jeor Equation?

The Mifflin-St Jeor equation estimates Basal Metabolic Rate (BMR) from weight, height, and age. It provides a more accurate assessment of resting energy expenditure than older equations, especially for different body compositions.

2. How Does the Calculator Work?

The calculator uses the Mifflin-St Jeor equation:

Where:

• \( weight \) — Body weight in kilograms (kg)
• \( height \) — Height in centimeters (cm)
• \( age \) — Age in years

Explanation: The equation accounts for the basic energy requirements of the body at rest, considering body size and age factors.

3. Importance of BMR Calculation

Details: Accurate BMR estimation is crucial for determining daily caloric needs, weight management planning, and designing appropriate nutrition plans for health and fitness goals.

4. Using the Calculator

Tips: Enter weight in kilograms, height in centimeters, and age in years. 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 one of the most accurate equations for estimating BMR in healthy individuals and has been validated across various populations.

Q2: What are typical BMR values?
A: BMR varies by individual but typically ranges from 1200-2000 kcal/day for adults. Values are influenced by body composition, age, and gender.

Q3: When should BMR be measured?
A: For most accurate results, measure after overnight fasting, in a rested state, and in a thermoneutral environment.

Q4: Are there limitations to this equation?
A: The equation may be less accurate for extremely muscular individuals, those with very high or low body fat percentages, and certain medical conditions.

Q5: How does BMR relate to total daily energy expenditure?
A: BMR represents about 60-75% of total daily energy expenditure. To calculate total needs, multiply BMR by an activity factor based on lifestyle.