BMI Calculator
Work out your body mass index from height and weight, in metric or imperial units. For adults aged 18 and over.
Questions
What is BMI?
Body mass index is weight in kilograms divided by height in metres squared. It is a quick screening number, not a diagnosis.
What is a healthy BMI?
For adults the World Health Organization range is 18.5 to 24.9. Below 18.5 is underweight, 25 to 29.9 is overweight and 30 or more is obesity.
Is BMI accurate for everyone?
No. It does not separate muscle from fat, and it can be misleading for athletes, older adults and some ethnic groups. It is not for children. Talk to a doctor about your own health.