BMI and mental health: limits of a number
The short answer
BMI does not measure emotional wellbeing, assess eating behavior or diagnose a mental health condition or eating disorder. A category is not a judgment about a person. A lower number alone does not establish improved mental health; personal concerns need appropriate healthcare support.
BMI does not measure emotional wellbeing, assess eating behavior or diagnose a mental health condition or eating disorder. A category is not a judgment about a person. A lower number alone does not establish improved mental health; personal concerns need appropriate healthcare support.
How we calculate
Body mass index (BMI) is weight in kilograms divided by height in metres squared. It is one screening measure, not a diagnosis or a direct measurement of body fat.
Imperial inputs are converted using 1 lb = 0.45359237 kg and 1 in = 2.54 cm. Five feet nine inches is 69 inches, not 5.9 feet.
Units are converted before calculation. Categories use the unrounded result; only the display is rounded. The shortcut multiplier 703 can differ slightly from exact conversion.
Screening scope
Adult (20+), not pregnant. For ages 2–19, use a validated BMI-for-age calculator. This tool shows adult ranges only.
BMI is one screening measure, not a diagnosis or a weight goal. It does not distinguish muscle from fat and is not suitable for pregnancy.
This explanation checks the method and arithmetic. It does not claim an independent medical review. Personal interpretation requires context and an appropriate healthcare professional.
Sources
Sources below are in English.