Wraplet guide
How to Use BMI as a Screening Tool
Learn what BMI can and cannot tell you, why it is a screening estimate, and when to ask a healthcare professional.
What BMI can show
BMI compares weight with height and places the result into broad categories. It can be useful as a quick population-level screening number.
The formula is BMI = weight in kilograms / height in meters squared.
What BMI cannot show
BMI does not directly measure body fat, muscle, pregnancy, age-specific risk, ethnicity-specific risk, or medical history.
Use BMI as a starting point for discussion, not as a diagnosis or treatment plan.
Frequently asked questions
Is BMI enough to judge health?
No. BMI is only one screening estimate and should be interpreted with other health information.
Who should I ask about BMI concerns?
Ask a qualified healthcare professional who can consider your full medical context.