1. What is BMI?

BMI (Body Mass Index) 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 to Calculate BMI

The BMI calculation formula is:

Where:

• Weight — Measured in kilograms (kg)
• Height — Measured in meters (m)

Example: For a person who weighs 70kg and is 1.75m tall:
BMI = 70 ÷ (1.75 × 1.75) = 22.9 kg/m²

3. BMI Categories

Standard BMI Categories:

• Underweight: BMI less than 18.5
• Normal weight: BMI 18.5 to 24.9
• Overweight: BMI 25 to 29.9
• Obese: BMI 30 or greater

4. Using the Calculator

Instructions: Enter your weight in kilograms and height in meters. The calculator will compute your BMI and indicate your weight category.

5. Frequently Asked Questions (FAQ)

Q1: Is BMI accurate for everyone?
A: BMI may overestimate body fat in athletes and those with muscular builds, and underestimate it in older persons who have lost muscle mass.

Q2: What is a healthy BMI range?
A: For most adults, a healthy BMI is between 18.5 and 24.9.

Q3: Can children use this calculator?
A: Children need age- and sex-specific BMI percentiles rather than adult categories.

Q4: How often should I check my BMI?
A: Periodic checks (every 6-12 months) can help track weight changes, but daily fluctuations are normal.

Q5: What if my BMI is in the overweight or obese range?
A: Consult with a healthcare provider for personalized advice on diet and exercise.