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"))))

The Body Mass Index (BMI) and Basal Metabolic Rate (BMR) formulas are also featured in the Body Lab – Nutrition & Fitness Management System.