BMI calculator - Advance Surgical Perth


Check if you are a candidate for bariatric surgery. Queries will be answered by Dr Jon Armstrong.
Body Mass Index (BMI) is measure of body fat based on height and weight that applies to both adult men and women. BMI does not differentiate between body fat and muscle mass. Therefore, body builders and people who have a lot of muscle bulk will have a high BMI but are not overweight or obese.

BMI calculator - Advance Surgical Perth

Calculate your BMI

Weight (kg)
Height (cm)
check bmi

BMI calculator - Advance Surgical Perth

BMI classifications

BMI is 18.5 or less

If your BMI is 18.5 or less, it falls within the underweight range.

BMI is between 18.5 and 25

If your BMI is 18.5 to 25 ,it falls within the normal range.

BMI is between 25 and 30

If your BMI is 25 to 30, it falls within the overweight range.

BMI is between 30 and 35

A BMI of 30-35 is considered Class I (low-risk) obese. People considered Class I obese could benefit from bariatric surgery, particularly if they are already diabetic or have a really significant weight related co-morbidity.

BMI is between 35 and 39.9

A BMI of of 35 – 39.9  is considered Class 2 (moderate-risk) obesity.

BMI is 40 or more

A BMI of 40 or greater  is considered Class 3 (high-risk) obesity.

At Advance Surgical, Mr Jon Armstrong and the team help people who want to lose weight through bariatric surgery, suffer from an endocrine disorder or need general surgery.

Bariatric surgeon Perth


Combined Shape

Established in 2005

When we established Advance Surgical our motivation was to help those who find that diet and exercise are simply not working for them.

The cost of bariatric surgery

We understand the cost of bariatric surgery may be an issue. We have changed our pricing to be more affordable. Payment plans available.

Team of specialists

Mr Jon Armstrong, Medical Director and Founder alongside the team at Advance Surgical, have helped thousands of people in Perth.