Calculate My Basal Metabolic Rate

Mifflin-St Jeor Equation:

\[ BMR = 10 \times Weight + 6.25 \times Height - 5 \times Age + 5 \text{ (men)} \text{ or } -161 \text{ (women)} \]

Weight:

Height:

Age:

years

Gender:

Basal Metabolic Rate (BMR):

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1. What is Basal Metabolic Rate?

Basal Metabolic Rate (BMR) is the number of calories your body needs to perform basic life-sustaining functions at rest. It represents the minimum energy required to maintain vital functions like breathing, circulation, and cell production.

2. How Does the Calculator Work?

The calculator uses the Mifflin-St Jeor equation:

\[ BMR = 10 \times Weight + 6.25 \times Height - 5 \times Age + 5 \text{ (men)} \text{ or } -161 \text{ (women)} \]

Where:

\( Weight \) — Body weight in kilograms (kg)
\( Height \) — Height in centimeters (cm)
\( Age \) — Age in years
+5 — Constant for males
-161 — Constant for females

Explanation: This equation provides the most accurate estimate of BMR for most adults and is widely used in clinical settings.

3. Importance of BMR Calculation

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

4. Using the Calculator

Tips: Enter your weight in kg, height in cm, 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 BMR and RMR?
A: BMR measures energy expenditure in a completely rested, fasted state, while RMR (Resting Metabolic Rate) is measured under less strict conditions and is typically slightly higher.

Q2: How accurate is the Mifflin-St Jeor equation?
A: It's considered one of the most accurate equations for estimating BMR in healthy adults, with an accuracy of about ±10% for most people.

Q3: Does muscle mass affect BMR?
A: Yes, muscle tissue burns more calories at rest than fat tissue. People with more muscle mass typically have a higher BMR.

Q4: How often should I recalculate my BMR?
A: You should recalculate whenever your weight changes significantly (5+ kg) or as you age, since BMR decreases with age.

Q5: Can I use BMR for weight loss planning?
A: Yes, BMR is the foundation for calculating Total Daily Energy Expenditure (TDEE), which helps determine appropriate calorie intake for weight loss or gain.