1. What is Resting Energy Expenditure (REE)?

Resting Energy Expenditure (REE) represents the amount of energy (calories) your body needs to maintain basic physiological functions at rest. It accounts for approximately 60-75% of total daily energy expenditure and is influenced by factors such as weight, height, age, and gender.

2. How Does the Calculator Work?

The calculator uses the Mifflin-St Jeor equations:

Where:

• Weight — Body weight in kilograms (kg)
• Height — Height in centimeters (cm)
• Age — Age in years
• Gender — Biological sex (male/female)

Explanation: These equations provide a scientifically validated method for estimating basal metabolic rate, which forms the foundation for calculating total daily energy needs.

3. Importance of REE Calculation

Details: Accurate REE estimation is crucial for developing appropriate nutritional plans, weight management strategies, and clinical nutrition support. It helps determine the baseline calorie requirements for maintaining current weight.

4. Using the Calculator

Tips: Enter your current 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's the difference between REE and BMR?
A: While often used interchangeably, REE (Resting Energy Expenditure) is typically about 10% higher than BMR (Basal Metabolic Rate) as it includes energy expended during normal daily activities at rest.

Q2: How accurate is this calculation?
A: The Mifflin-St Jeor equations are considered one of the most accurate predictive equations for estimating REE in healthy individuals, with accuracy around ±10%.

Q3: Should I measure my weight and height at a specific time?
A: For most consistent results, measure your weight in the morning after using the bathroom and before eating or drinking. Height should be measured without shoes.

Q4: Are there factors that can affect my actual REE?
A: Yes, factors such as body composition (muscle mass vs. fat mass), thyroid function, pregnancy, illness, and certain medications can influence your actual resting energy expenditure.

Q5: How often should I recalculate my REE?
A: Recalculate whenever your weight changes significantly (more than 2-3 kg) or at least every 6 months, as age and body composition changes can affect your metabolic rate.