BMI Tracker

BMI Chart

This BMI chart shows the standard adult Body Mass Index categories and their ranges, so you can see at a glance where a result falls. Use the BMI index chart below as a reference, then calculate your BMI in metric or US units to find your own number.

Adult BMI index chart

For adults 20 and older, BMI is read against fixed categories published by the U.S. Centers for Disease Control and Prevention (CDC). The chart includes the three obesity sub-classes so you can see the full range.

BMI index chart for adults 20 and older
Category BMI range
Underweight Below 18.5
Healthy Weight 18.5 - 24.9
Overweight 25.0 - 29.9
Obesity 30.0 and above
Class 1 Obesity 30.0 - 34.9
Class 2 Obesity 35.0 - 39.9
Class 3 Obesity 40.0 and above

How to read the BMI chart

Find your BMI number, then locate the row whose range contains it. A BMI below 18.5 is underweight, 18.5 to 24.9 is the healthy weight range, 25.0 to 29.9 is overweight, and 30.0 or above falls into the obesity range. The chart is the same whether you measure in kilograms and centimetres or in pounds and inches - BMI is a single number, so one chart covers both unit systems.

Remember that the BMI chart is a screening reference, not a diagnosis. It does not measure body fat directly and does not account for muscle mass or where fat is stored, so use it as a starting point and discuss your result with a healthcare provider if you have questions.

BMI chart for children and teens

The adult chart above does not apply to anyone aged 2 to 19. Children and teens are still growing, so their BMI is interpreted with age- and sex-specific percentiles from growth charts rather than fixed ranges. To work with a young person, use our child BMI calculator and the BMI calculator by age.

Calculate your BMI

Ready to find your number? Pick the calculator that matches how you measure:

For definitions and common questions about reading the chart, see our BMI FAQ.