1. What is BMI?

Body Mass Index (BMI) is a simple index of weight-for-height that is commonly used to classify underweight, normal weight, overweight and obesity in adults. It is calculated by dividing weight in kilograms by the square of height in meters.

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 calculates body mass per unit of height squared, providing a standardized measure of body composition.

3. Importance of BMI Calculation

Details: BMI is a simple screening tool for weight categories that may lead to health problems. It helps identify potential weight problems in adults, though it doesn't measure body fat directly.

4. Using the Calculator

Tips: Enter weight in kilograms and height in meters. For accurate results, measure weight without heavy clothing and height without shoes.

5. Frequently Asked Questions (FAQ)

Q1: What are the BMI categories according to Sri Lanka standards?
A: Underweight (<18.5), Normal weight (18.5-22.9), Overweight (23-27.4), Obese (≥27.5).

Q2: Is BMI accurate for everyone?
A: BMI may not be accurate for athletes (high muscle mass), pregnant women, or the elderly (muscle loss).

Q3: How often should I check my BMI?
A: For most adults, checking every 3-6 months is sufficient unless you're actively trying to change your weight.

Q4: What's a healthy BMI range?
A: For Sri Lankan adults, a BMI between 18.5 and 22.9 is generally considered healthy.

Q5: Should children use this calculator?
A: No, children and teens need age- and sex-specific BMI calculators as their body composition changes with growth.