1. What is Body Mass Index (BMI)?

BMI is a simple index of weight-for-height that is commonly used to classify underweight, normal weight, overweight and obesity in adults. It provides a useful population-level measure of overweight and obesity.

2. How Does the Calculator Work?

The calculator uses the BMI formula:

Where:

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

Explanation: The BMI calculation divides a person's weight in kilograms by the square of their height in meters.

3. Importance of BMI Calculation

Details: BMI is a simple, inexpensive screening method for weight category—underweight, healthy weight, overweight, and obesity. It's particularly important for pregnant women to maintain a healthy BMI.

4. Using the Calculator

Tips: Enter weight in kilograms and height in meters. All values must be valid (weight > 0, height > 0). For pregnancy, consult your healthcare provider for BMI interpretation.

5. Frequently Asked Questions (FAQ)

Q1: What is a healthy BMI range for pregnant women?
A: Generally, the same ranges apply (18.5-24.9 normal), but individual recommendations may vary based on pre-pregnancy weight.

Q2: Does BMI calculation change during pregnancy?
A: The calculation remains the same, but interpretation should consider pregnancy weight gain recommendations.

Q3: How often should BMI be checked during pregnancy?
A: Your healthcare provider will monitor your weight gain at prenatal visits, typically using pre-pregnancy BMI as a baseline.

Q4: Are there limitations to BMI for pregnant women?
A: Yes, BMI doesn't distinguish between fat, muscle, and pregnancy-related weight (baby, amniotic fluid, etc.).

Q5: What weight gain is recommended based on pre-pregnancy BMI?
A: Underweight (BMI <18.5): 12.5-18kg; Normal (18.5-24.9): 11.5-16kg; Overweight (25-29.9): 7-11.5kg; Obese (≥30): 5-9kg.