1. What is the St Jeor BMR Equation?

The St Jeor equation is a widely used formula for estimating Basal Metabolic Rate (BMR), which represents the number of calories your body needs at complete rest to maintain basic physiological functions.

2. How Does the Calculator Work?

The calculator uses the St Jeor BMR equation:

Where:

• \( Weight \) — Body weight in kilograms (kg)
• \( Height \) — Height in centimeters (cm)
• \( Age \) — Age in years
• \( s \) — 5 for men, -161 for women

Explanation: The equation accounts for the basic energy requirements based on body size, age, and gender differences in metabolism.

3. Importance of BMR Calculation

Details: Knowing your BMR is essential for creating effective weight management plans, determining daily caloric needs, and understanding your body's basic energy requirements.

4. Using the Calculator

Tips: Enter your weight in kilograms, height in centimeters, age in years, and select your gender. All values must be valid (weight > 0, height > 0, age between 1-120).

5. Frequently Asked Questions (FAQ)

Q1: What is the difference between BMR and RMR?
A: BMR (Basal Metabolic Rate) measures energy expenditure at complete rest, while RMR (Resting Metabolic Rate) measures energy expenditure at rest but not necessarily complete rest. They are often used interchangeably.

Q2: How accurate is the St Jeor equation?
A: The St Jeor equation is considered one of the most accurate BMR prediction formulas, with an accuracy of about ±10% for most populations.

Q3: Why does BMR decrease with age?
A: BMR typically decreases with age due to loss of muscle mass, hormonal changes, and decreased cellular activity.

Q4: Can I increase my BMR?
A: Yes, through regular exercise (especially strength training), building muscle mass, and maintaining proper nutrition.

Q5: How often should I recalculate my BMR?
A: It's recommended to recalculate your BMR every 3-6 months, or after significant changes in weight, body composition, or lifestyle.