How it works
BMI divides weight in kilograms by height in metres squared. It is an adult screening measure and does not directly measure body fat, muscle, or overall health. The displayed bands are general adult categories and are not suitable for children or pregnancy.
Standard formula
weight (kg) / height (m)²Worked example
At 70 kg and 175 cm: 70 / 1.75² = 22.86. This falls in the general adult range of 18.5 to less than 25.
Frequently Asked Questions
Can BMI measure body fat?
No. It uses only height and weight, so it cannot distinguish fat from muscle.
What range is displayed as healthy?
The general adult band is 18.5 to less than 25. A category alone does not determine individual health.
Is this suitable for children?
No. Children and teenagers require age- and sex-specific BMI percentiles.
How do I enter feet or pounds?
Convert your measurements with the Unit Converter, then enter centimetres and kilograms here.
Source: CDC: Adult BMI categories