Which BMR Calculator Is Most Accurate

Mifflin-St Jeor Equation:

\[ BMR = 10 \times weight + 6.25 \times height - 5 \times age - 161 \]

Basal Metabolic Rate (BMR):

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1. What is the Mifflin-St Jeor Equation?

The Mifflin-St Jeor equation is considered the most accurate formula for calculating Basal Metabolic Rate (BMR) - the number of calories your body needs at rest to maintain basic physiological functions. It provides a more precise estimation than older equations like Harris-Benedict.

2. How Does the Calculator Work?

The calculator uses the Mifflin-St Jeor equation:

\[ BMR = 10 \times weight + 6.25 \times height - 5 \times age - 161 \]

Where:

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

Explanation: This equation accounts for the fundamental factors that influence metabolic rate: body mass, height, and age. The constant -161 adjusts for average metabolic differences.

3. Importance of BMR Calculation

Details: Accurate BMR calculation is essential for determining daily caloric needs, creating effective weight management plans, and establishing appropriate nutritional requirements for health maintenance and athletic performance.

4. Using the Calculator

Tips: Enter your weight in kilograms, height in centimeters, and age in years. All values must be valid (weight > 0, height > 0, age between 1-120). For best results, use accurate measurements.

5. Frequently Asked Questions (FAQ)

Q1: Why is Mifflin-St Jeor considered the most accurate?
A: Research shows it has the highest accuracy rate (about 70%) in predicting actual measured BMR across diverse populations compared to other equations.

Q2: How does BMR differ from TDEE?
A: BMR represents calories burned at complete rest, while Total Daily Energy Expenditure (TDEE) includes all daily activities and exercise.

Q3: Does this equation work for both men and women?
A: This specific equation is designed for women. For men, the equation is: BMR = 10 × weight + 6.25 × height - 5 × age + 5.

Q4: How often should I recalculate my BMR?
A: Recalculate every 3-6 months or after significant weight changes (±5 kg) to ensure accuracy for dietary planning.

Q5: Are there limitations to this equation?
A: While highly accurate for most people, it may be less precise for extremely muscular individuals, those with very high body fat percentages, or people with certain medical conditions affecting metabolism.