What is BMI?
Body mass index is weight in kilograms divided by height in metres squared. It is a screening measure and does not directly measure body fat or diagnose a health condition.
Understanding the result
For adults, standard categories commonly classify BMI below 18.5 as underweight, 18.5–24.9 as healthy weight, 25–29.9 as overweight, and 30 or above as obesity. These ranges do not apply to children and teenagers and may not fully reflect individual health.
Related tools and guides
Explore more practical tools and explainers across Publication Today. Use all estimates as general information and verify important decisions with qualified sources.