Body Weight Calorie Calculator

Harris-Benedict Equation:

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

Weight:

Height:

Age:

years

Gender:

Basal Metabolic Rate (BMR):

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1. What is the Harris-Benedict Equation?

The Harris-Benedict equation estimates basal metabolic rate (BMR), which represents the number of calories your body needs at rest to maintain basic physiological functions. It's widely used for determining daily calorie requirements.

2. How Does the Calculator Work?

The calculator uses the Harris-Benedict equation:

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

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: The equation calculates the minimum energy expenditure required to sustain vital functions while at complete rest.

3. Importance of BMR Calculation

Details: Knowing your BMR is essential for weight management, creating personalized diet plans, and understanding your body's basic energy requirements. It serves as the foundation for calculating total daily energy expenditure.

4. Using the Calculator

Tips: Enter weight in kilograms, height in centimeters, age in years, and select gender. For accurate results, measure weight in the morning after using the bathroom and before eating.

5. Frequently Asked Questions (FAQ)

Q1: What is the difference between BMR and RMR?
A: BMR (Basal Metabolic Rate) measures energy expenditure in a fasting state under strict resting conditions, while RMR (Resting Metabolic Rate) is measured under less restrictive conditions and is typically slightly higher.

Q2: How accurate is the Harris-Benedict equation?
A: It's about 90% accurate for most people, but individual variations in muscle mass, body composition, and metabolic health can affect accuracy.

Q3: How do I calculate my total daily calorie needs?
A: Multiply your BMR by an activity factor: Sedentary (1.2), Lightly active (1.375), Moderately active (1.55), Very active (1.725), Extremely active (1.9).

Q4: Why are there different equations for men and women?
A: Men typically have higher muscle mass and lower body fat percentage, resulting in higher metabolic rates compared to women of the same weight and height.

Q5: How often should I recalculate my BMR?
A: Recalculate every 3-6 months or after significant weight changes (±5 kg), as weight loss or gain affects metabolic rate.