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. It provides a numeric value that categorizes individuals as underweight, normal weight, overweight, or obese.

2. How Does the Calculator Work?

The calculator uses the standard BMI formula:

Where:

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

Explanation: The formula divides the weight by the square of the height to get a standardized measure of body mass relative to height.

3. Importance of BMI Calculation

Details: BMI is a simple screening tool to identify possible weight problems in adults. While it doesn't measure body fat directly, research has shown that BMI correlates to direct measures of body fat.

4. Using the Calculator

Tips: Enter weight in kilograms and height in meters. All values must be valid (weight > 0, height > 0). For pounds and inches, convert first (1 kg = 2.2 lbs, 1 m = 39.37 inches).

5. Frequently Asked Questions (FAQ)

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

Q2: Does BMI apply to everyone?
A: BMI may overestimate body fat in athletes and underestimate it in older people who have lost muscle mass.

Q3: How accurate is BMI?
A: BMI is a useful screening tool but doesn't account for muscle mass, bone density, or fat distribution.

Q4: Should children use this calculator?
A: No, children and teens need age- and sex-specific BMI calculations due to growth patterns.

Q5: What's the Python code for BMI calculation?
A: Here's a simple Sololearn-style Python implementation:
weight = float(input("Enter weight in kg: "))
height = float(input("Enter height in m: "))
bmi = weight / (height ** 2)
print("Your BMI is:", round(bmi, 1))