Health calculator
BMI Calculator
Calculate adult body mass index and view the corresponding CDC screening category.
Your inputs
Enter your measurements
BMI is an adult screening measure, not a diagnosis. It does not directly measure body fat or account for every individual difference.
Healthy weight
22.9
About this tool
Calculate adult body mass index
Body mass index divides weight in kilograms by height in meters squared. For adults age 20 and older, CDC screening categories classify results as underweight, healthy weight, overweight, or obesity.
BMI is a screening measure rather than a diagnosis and does not directly measure body fat. Muscle mass, age, body composition, pregnancy, and other individual factors can affect how useful the number is.
How it works
Calculate BMI in three steps
- 1Choose units
Switch between metric kilograms and centimeters or US pounds and inches.
- 2Enter measurements
Add current weight and height.
- 3Review the screening result
See BMI, category, and a height-based healthy-weight range.
Common questions
BMI Calculator FAQ
What is a healthy adult BMI?
CDC defines the healthy-weight screening range for adults as 18.5 to less than 25.
Is BMI a body-fat measurement?
No. BMI uses only height and weight and should be considered with other health information.
Is this calculator for children?
No. Children and teens require age- and sex-specific BMI percentiles.
References
Sources & references
This tool is informational and is not a substitute for professional medical or financial advice. Its methodology draws on the primary sources below.