Bmr Calculator All Ages

Harris-Benedict Equation (Men):

\[ BMR = 88.362 + (13.397 \times W) + (4.799 \times H) - (5.677 \times A) \]

Basal Metabolic Rate (BMR):

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1. What is the Harris-Benedict Equation?

The Harris-Benedict equation estimates basal metabolic rate (BMR) from weight, height, age, and gender. It provides an estimate of the calories your body needs to perform basic life-sustaining functions at rest.

2. How Does the Calculator Work?

The calculator uses the Harris-Benedict equation for men:

\[ BMR = 88.362 + (13.397 \times W) + (4.799 \times H) - (5.677 \times A) \]

Where:

\( W \) — Weight in kilograms (kg)
\( H \) — Height in centimeters (cm)
\( A \) — Age in years

Explanation: The equation calculates the number of calories your body needs to maintain basic physiological functions while at complete rest.

3. Importance of BMR Calculation

Details: Knowing your BMR is essential for creating effective weight management plans, whether for weight loss, maintenance, or gain. It forms the foundation for calculating total daily energy expenditure.

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: 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 under strict laboratory conditions.

Q2: How accurate is the Harris-Benedict equation?
A: While widely used, it's an estimation that may vary by ±10-15% from actual measured BMR. Individual factors like body composition and genetics can affect accuracy.

Q3: Should I use this equation if I'm a woman?
A: No, this calculator uses the male equation. Women should use the female-specific Harris-Benedict equation: BMR = 447.593 + (9.247 × W) + (3.098 × H) - (4.330 × A)

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

Q5: Can I use BMR for weight loss planning?
A: Yes, BMR forms the basis for calculating your total daily energy needs. For weight loss, create a calorie deficit below your maintenance calories (BMR × activity factor).