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BMI Calculator

What Is a BMI Calculator?
 

A Body Mass Index calculator estimates BMI using a person's height and weight. For adults age 20 and older, BMI is commonly used as a screening measurement to group results into underweight, healthy-weight, overweight, and obesity categories. 
 

BMI does not measure body fat directly and should not be treated as a diagnosis. A healthcare professional may consider other information when evaluating a person's health.

Frequently Asked Questions
 

How is BMI calculated?

BMI is calculated by dividing weight in kilograms by height in meters squared. When pounds and inches are entered, the calculator converts those measurements into an equivalent BMI result.
 

What are the adult BMI categories?

For adults age 20 and older, the standard categories are:

  • Below 18.5: Underweight

  • 18.5 to 24.9: Healthy Weight

  • 25.0 to 29.9: Overweight

  • 30.0 or higher: Obesity

These ranges match the adult categories published by the CDC and National Heart, Lung, and Blood Institute. 
 

Can this calculator be used for children?

No. Children and teenagers ages 2 through 19 require a BMI-for-age calculation that considers age and sex-specific percentiles. 
 

Is BMI a complete measure of health?

No. BMI is a screening measurement based only on height and weight. It does not provide a complete assessment of body composition or overall health.
 

Is my information saved?

No. The height and weight entered into this calculator are processed inside the visitor's browser and are not stored by the calculator.

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