The metric formula for Body Mass Index (BMI) is:

BMI = weight (kg) / height^2 (m^2)

where weight is measured in kilograms and height is measured in meters.

A BMI between 18.5 and 24.9 is generally considered to be within the healthy range for adults, although it’s important to note that BMI is just one measure of health and should be interpreted in the context of other factors such as body composition, lifestyle, and medical history.

A useful alternative to calculating your BMI, is to calculate your body fat percentage – as BMI doesn’t account for lean body mass:

Calculate your body fat percentage here