What is Body Mass Index (BMI)?

Body Mass Index (BMI) is a screening metric that uses a person's height and weight to estimate body fat and categorize them as underweight, normal weight, overweight, or obese.

What is the healthy BMI range according to WHO?

According to the World Health Organization (WHO), a BMI between 18.5 and 24.9 indicates a healthy normal weight for adults. Less than 18.5 is considered underweight, 25.0 to 29.9 is overweight, and 30.0 or higher is classified as obese.

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Frequently Asked Questions

1. What is the mathematical formula for calculating BMI?

BMI is calculated using the formula: BMI = Weight (in kilograms) ÷ [Height (in meters)]². For example, for 70 kg and 1.75 m height: 70 ÷ (1.75 × 1.75) = 22.86 kg/m².

2. What are the official World Health Organization (WHO) BMI categories?

WHO classifies adult BMI as: Underweight (< 18.5), Normal / Healthy Weight (18.5 – 24.9), Overweight (25.0 – 29.9), and Obese (30.0 and above).

3. Does BMI vary between men and women?

For adults aged 20 and older, standard WHO BMI cut-off thresholds are identical for both men and women. However, body fat percentage at a specific BMI often differs by gender.