Body Mass Index (BMI) is a quick screening measure that compares your weight to your height. Doctors and the World Health Organization use it as a first-pass indicator of whether your weight sits in a healthy range. Enter your details below — the tool works with both metric (kg/cm) and imperial (lb/ft) units.
About this tool
What your result means: A BMI below 18.5 is classed as underweight, 18.5–24.9 as a healthy weight, 25–29.9 as overweight, and 30 or above as obese. BMI is a useful starting point, but it does not measure body fat directly — muscular athletes, pregnant women and older adults may get misleading readings. Pair it with our body fat calculator for a fuller picture, and speak with a healthcare professional about any weight concerns.
This tool is for general information and screening purposes only. It is not medical advice and cannot diagnose any condition. Always consult a qualified healthcare professional about your health.