Estimate adult body mass index and its reference range from height and weight.
Reviewed: 2026-07-21
Calculate BMI by dividing weight by height squared, using either cm and kg or ft, in, and lb. The displayed categories are general adult screening ranges and may not fit pregnancy, children, adolescents, or people with high muscle mass. Measurements are processed only in your browser, and the result is not a diagnosis or individualized medical assessment.
Check input units and reference dates first. For an important decision, compare the result with an official source or original document. A rounded display can differ slightly from the underlying value.
Weight in kilograms is divided by height in meters squared. Imperial entries are converted internally to the same formula.
No. BMI is an adult screening indicator and does not fully account for fat distribution, muscle mass, illness, or individual circumstances.
No. The categories shown are for adults. Children and adolescents need age-specific and sex-specific growth charts reviewed with a health professional.