Calorie Calculator Age Weight Height

Mifflin-St Jeor Formula:

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

Weight:

Height:

Age:

years

Gender:

Basal Metabolic Rate (BMR):

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1. What is the Mifflin-St Jeor Formula?

The Mifflin-St Jeor formula is a widely used equation to estimate Basal Metabolic Rate (BMR), which represents the number of calories your body needs at rest to maintain basic physiological functions. It's considered one of the most accurate BMR formulas for the general population.

2. How Does the Calculator Work?

The calculator uses the Mifflin-St Jeor formula:

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

Where:

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

Explanation: The formula calculates the minimum energy expenditure required to sustain vital functions while at complete rest, taking into account individual body composition and demographic factors.

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 serves as the foundation for determining total daily energy expenditure when combined with activity level factors.

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). For accurate results, use current measurements.

5. Frequently Asked Questions (FAQ)

Q1: Why use Mifflin-St Jeor instead of other formulas?
A: The Mifflin-St Jeor formula is considered more accurate than older formulas like Harris-Benedict, especially for obese individuals, as it better accounts for lean body mass.

Q2: What factors can affect BMR?
A: BMR is influenced by age, gender, body composition, genetics, thyroid function, and environmental factors. Muscle mass increases BMR while fat mass has less metabolic activity.

Q3: How often should I recalculate my BMR?
A: Recalculate whenever there are significant changes in weight, muscle mass, or age (every few months or after major lifestyle changes).

Q4: Can BMR change over time?
A: Yes, BMR typically decreases with age due to loss of muscle mass and changes in hormone levels. Regular exercise, especially strength training, can help maintain or increase BMR.

Q5: How do I use BMR for weight management?
A: Multiply your BMR by an activity factor to get your Total Daily Energy Expenditure (TDEE), then adjust calorie intake based on your weight goals (deficit for loss, surplus for gain).