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 height in meters squared.

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 provides a simple numeric measure of a person's thickness or thinness, allowing health professionals to discuss weight problems objectively with their patients.

3. Importance of BMI Calculation

Details: BMI is an inexpensive and easy screening method for weight category—underweight, healthy weight, overweight, and obesity. For Singaporean adults, the following classifications apply:

• Below 18.5: Underweight
• 18.5 to 22.9: Normal weight
• 23.0 to 27.4: Overweight (moderate risk)
• 27.5 and above: Obese (high risk)

4. Using the Calculator

Tips: Enter weight in kilograms and height in meters. All values must be valid (weight > 0, height > 0). For best results, measure height without shoes and weight with minimal clothing.

5. Frequently Asked Questions (FAQ)

Q1: Is BMI different for males and females?
A: The same BMI formula applies to both males and females, though body composition differences mean the same BMI may represent different body fat percentages.

Q2: Why are Singapore BMI categories different?
A: Singapore uses lower BMI cut-offs because Asians tend to have higher body fat percentages at lower BMIs compared to Caucasians.

Q3: What are BMI limitations?
A: BMI doesn't distinguish between muscle and fat, so muscular individuals may be classified as overweight. It also doesn't account for fat distribution.

Q4: Is BMI accurate for children?
A: No, this calculator is for adults. Children's BMI needs to be interpreted using age- and sex-specific percentiles.

Q5: What's a healthy BMI for Singaporeans?
A: For Singaporeans, a BMI between 18.5 to 22.9 is considered healthy, with increased health risks above 23.0.