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BMI is a person’s weight in kilograms divided by the square of height in meters. A high BMI can indicate high body fatness.

If your BMI is less than 18.5, it falls within the underweight range.
If your BMI is 18.5 to <25, it falls within the healthy weight range.
If your BMI is 25.0 to <30, it falls within the overweight range.
If your BMI is 30.0 or higher, it falls within the obesity range.

Obesity is frequently subdivided into categories:

Class 1: BMI of 30 to < 35
Class 2: BMI of 35 to < 40
Class 3: BMI of 40 or higher. Class 3 obesity is sometimes categorized as “severe” obesity.

SOURCE:

https://www.cdc.gov/obesity/basics/adult-defining.html#:~:text=If%20your%20BMI%20is%2018.5,falls%20within%20the%20obesity%20range.