BMI Calculator

You might be wondering why weight is not the only factor bariatric (weight loss) surgeons look at when assessing a patient’s suitability for a weight loss procedure. This is because there is no set weight; for example, a taller individual will be able to carry more weight comfortably, compared to a shorter individual.

This is where the formula known as Body Mass Index (BMI) is used to calculate if your weight is healthy. It is the primary indicator used by bariatric surgeons to assess a patient’s suitability for procedures and to monitor post-procedure weight loss.

What does your BMI result mean?

For most adults, an ideal BMI is in the 18.5 to 24.9 range. Below is the breakdown of the defined thresholds of weight:

BMICategoryRisk of associated co-morbidities*
18.5 or lessUnderweightN/A
18.5 – 24.9NormalLow
25.0 – 29.9OverweightIncreased
30.0 – 34.9ObeseHigh
35.0 – 49.9Morbidly ObeseVery High
50.0 or greaterSuper ObeseExtremely High