Calculate BMI And BMR

BMI and BMR Equations:

\[ BMI = \frac{weight}{height^2} \] \[ BMR = 10 \times weight + 6.25 \times height - 5 \times age + gender\_factor \]

Weight:

Height:

Age:

years

Gender:

Body Mass Index (BMI):

Basal Metabolic Rate (BMR):

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1. What are BMI and BMR?

BMI (Body Mass Index) is a measure of body fat based on height and weight. BMR (Basal Metabolic Rate) is the number of calories your body needs at rest to maintain basic functions like breathing and circulation.

2. How Does the Calculator Work?

The calculator uses these equations:

\[ BMI = \frac{weight\ (kg)}{height^2\ (m)} \] \[ BMR = 10 \times weight\ (kg) + 6.25 \times height\ (cm) - 5 \times age\ (years) + gender\_factor \]

Where:

\( weight \) — Body weight in kilograms
\( height \) — Height in meters (BMI) or centimeters (BMR)
\( age \) — Age in years
\( gender\_factor \) — +5 for men, -161 for women

3. Importance of BMI and BMR

BMI: Helps classify weight categories (underweight, normal, overweight, obese) and assess health risks associated with weight.
BMR: Essential for determining daily caloric needs and creating effective weight management plans.

4. Using the Calculator

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

5. Frequently Asked Questions (FAQ)

Q1: What is a healthy BMI range?
A: 18.5-24.9 is considered normal. Below 18.5 is underweight, 25-29.9 overweight, and 30+ obese.

Q2: How accurate is BMR calculation?
A: The Mifflin-St Jeor equation (used here) is about 90% accurate for most people, but individual variations exist.

Q3: Does BMI work for athletes?
A: BMI may overestimate body fat in muscular individuals as it doesn't distinguish between muscle and fat.

Q4: How often should I calculate my BMR?
A: Recalculate after significant weight changes (±5kg) or every 6 months as metabolism changes with age.

Q5: Can children use this calculator?
A: BMI interpretation is different for children - age and sex-specific percentiles should be used instead.