Body Mass Index (BMI)

One number from height and weight — and what it does and does not tell you.

How this is worked out

BMI cannot tell muscle from fat. Someone who trains can land in the "overweight" band with low body fat, while someone sedentary can sit in "normal" with high. It is a population screening tool, not an individual diagnosis.

These calculators are for general information and are not a substitute for medical advice. What you type stays in your browser; nothing is sent to a server.