### Create a Body Mass Index (BMI) Calculator

Body mass index (BMI) is a simple measure of body size based on height and weight that applies to adults and non-pregnant women. You can use Notion to calculate BMI as part of a fitness management system.

The formula that we use to calculate BMI is your weight (in kilograms) divided by the square of your height (in centimeters):

##### The Formulas

BMI = weight (kg) / (height (cm) x height (cm))

We can translate this into a Notion formula with:

`round(prop("Weight (kgs)") / (prop("Height (cms)") / 100 * prop("Height (cms)") / 100) * 100) / 100`

Note: this formula requires two properties named “Weight (kgs)” and “Height (cms)”

The formula for BMI using the Imperial system includes a conversion factor from Imperial to Metric:

BMI = weight (lbs) / (height (in) / height (in)) x 703

We can translate this into a Notion formula with:

`round(prop("Weight (lbs)") / (prop("Height (in)") / 100 * prop("Height (in)") / 100) / 100 * 703) / 100`

Note: this formula requires two properties named “Weight (lbs)” and “Height (in)”

##### Determine Health Range

Once you have your BMI calculation, you can then determine the health range that it falls into using the following formula:

`if(prop("BMI") < 18.5, "Underweight", if(prop("BMI") >= 18.5 and prop("BMI") < 25, "Normal", if(prop("BMI") >= 25 and prop("BMI") < 30, "Overweight", if(prop("BMI") >= 30 and prop("BMI") < 40, "Obese", "Morbidly Obese"))))`