Bmi Calculation Formula In Python With Example

BMI Formula:

\[ BMI = \frac{weight\ (kg)}{[height\ (m)]^2} \]

BMI Result:

Python Example:

def calculate_bmi(weight_kg, height_m):
    """Calculate BMI using weight in kg and height in meters"""
    bmi = weight_kg / (height_m ** 2)
    return round(bmi, 1)

# Example usage
weight = 70.5  # kg
height = 1.75  # meters
bmi_result = calculate_bmi(weight, height)
print(f"BMI: {bmi_result} kg/m²")

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1. What is BMI?

Body Mass Index (BMI) is a simple calculation using a person's height and weight. The formula is BMI = kg/m² where kg is a person's weight in kilograms and m² is their height in meters squared. BMI provides a reliable indicator of body fatness for most people.

2. How Does the Calculator Work?

The calculator uses the standard BMI formula:

\[ BMI = \frac{weight\ (kg)}{[height\ (m)]^2} \]

Where:

\( weight \) — Body weight in kilograms (kg)
\( height \) — Height in meters (m)

Explanation: The formula divides a person's weight by the square of their height to categorize their weight status.

3. Importance of BMI Calculation

Details: BMI is a simple, inexpensive screening method for weight category—underweight, healthy weight, overweight, and obesity. It helps identify potential weight problems in adults.

4. Using the Calculator

Tips: Enter weight in kilograms and height in meters. For pounds and inches, convert first (1 kg = 2.2 lbs, 1 m = 39.37 inches).

5. Frequently Asked Questions (FAQ)

Q1: What are the BMI categories?
A: Underweight (<18.5), Normal weight (18.5-24.9), Overweight (25-29.9), Obese (≥30).

Q2: Is BMI accurate for everyone?
A: BMI may overestimate body fat in athletes and underestimate it in older persons with lost muscle mass.

Q3: How to convert pounds to kg?
A: Divide pounds by 2.205 (e.g., 150 lbs = 150/2.205 ≈ 68 kg).

Q4: How to convert feet/inches to meters?
A: 1 foot = 0.3048 m, 1 inch = 0.0254 m (e.g., 5'7" = (5×0.3048) + (7×0.0254) ≈ 1.70 m).

Q5: What's the Python formula for BMI?
A: bmi = weight_kg / (height_m ** 2) as shown in the example above.