Adult Body Mass Index (BMI) Calculator

How this calculator works

NHLBI defines adult BMI as kilograms divided by meters squared.

Change one assumption at a time to see which inputs have the greatest effect on the estimate.

Worked example

A person weighing 70 kg at 175 cm has a BMI near 22.9.

Limitations

Educational estimate only. This calculator does not diagnose any condition, provide medical advice, prescribe treatment, or replace a doctor or qualified healthcare professional. BMI is a screening measure, not a diagnosis, and is not interpreted the same way for children, pregnancy, older adults, or all body compositions.

Review this educational estimate against current quotes, official information, and your own budget before making a financial decision.