BMI Calculator

Calculate adult body mass index from metric height and weight and view a neutral screening-range interpretation of the result.

Calculate body mass index

22.9Standard rangeBMI is a screening measure, not a diagnosis.

How this tool works

Body mass index is a simple adult screening ratio based on weight relative to height. This calculator performs the metric calculation locally and presents restrained range language because BMI cannot evaluate body composition, health history, or individual risk.

Metric BMI equals weight in kilograms divided by height in metres squared. Height entered in centimetres is first divided by 100 before the square is calculated.

How to use it

  1. Enter adult body weight in kilograms.
  2. Enter height in centimetres without footwear.
  3. Read the calculated BMI and screening-range description.

Worked examples

Metric BMI example

Input
70 kg and 175 cm
Output
BMI 22.9

Converting 175 centimetres to 1.75 metres and dividing 70 by 1.75 squared gives approximately 22.9, within the standard adult screening range.

Shorter height example

Input
60 kg and 160 cm
Output
BMI 23.4

The height becomes 1.60 metres. Dividing 60 kilograms by 1.60 squared produces about 23.4 after rounding to one decimal place.

Limitations

  • BMI is a screening measure and is not a medical diagnosis.
  • Adult BMI ranges are not appropriate for children, pregnancy, or every body composition.