BMI stands for Body Mass Index. It 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 metres squared.

What is a healthy BMI range?

For most adults, an ideal BMI is in the 18.5 to 24.9 range. A BMI below 18.5 is considered underweight, while a BMI between 25 and 29.9 is considered overweight.

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What is Body Mass Index (BMI)?

Body Mass Index (BMI) is a widely used screening method that categorizes a person's weight status. It is calculated based on your height and weight, providing a simple numeric value that helps health professionals assess whether you are at a healthy weight, underweight, overweight, or obese.

BMI Categories Table

According to the World Health Organization (WHO), standard BMI categories for adults are:

Classification	BMI Range (kg/m²)
Underweight	Below 18.5
Healthy Weight	18.5 – 24.9
Overweight	25.0 – 29.9
Obesity	30.0 and Above

How is BMI Calculated?

The calculation is simple but varies slightly depending on the unit system you use:

Metric Formula: Weight (kg) / [Height (m)]²
Imperial Formula: 703 × Weight (lbs) / [Height (in)]²

Our FilesWhiz BMI Calculator handles the math for you instantly, ensuring accuracy without the need for manual conversion.

Limitations of BMI

While BMI is a useful starting point, it does not measure body fat directly. It may not be accurate for athletes with high muscle mass (who might register as overweight), pregnant women, or the elderly. Always consult a healthcare provider for a complete health assessment.