BMI Calculator

Quickly calculate your Body Mass Index (BMI) to understand your health status using Metric or US units.

BMI Range Chart

Standard World Health Organization (WHO) categories

Category	Range
Underweight	< 18.5
Normal weight	18.5 – 24.9
Overweight	25.0 – 29.9
Obese Class I	30.0 – 34.9
Obese Class II	35.0 – 39.9
Obese Class III	≥ 40.0

This chart applies to adults aged 20 years and older. For children and teens, BMI is interpreted differently using age and sex-specific percentiles.

Did you know?

Maintaining a healthy weight is important for overall health. In addition to BMI, healthcare providers use other measurements and factors - such as skinfold thickness, waist circumference, and diet - to assess a person’s health status.

How to Use BMI Calculator

Select Units

Choose between Metric (kg/cm) or US (lbs/ft/in) systems.

Enter Details

Input your current weight and height accurately.

See Results

Check your BMI score and where it falls on the health chart.

Frequently Asked Questions

Is BMI the only measure of health?

No, while useful, BMI doesn't measure body fat directly or consider muscle mass, bone density, or overall body composition.

What if I have high muscle mass?

Athletes with high muscle mass may have a high BMI score while being perfectly healthy, as muscle is denser than fat.

How often should I check my BMI?

Checking every few months can help track trends in your weight and general health status.