Live Better
 
 

How to Calculate your BMI

Use our BMI calculator to get a snapshot of how healthy your weight is in relation to your height.

BMI is calculated by dividing your weight(kg) by your height(m) and then dividing the answer by your height(m) again. Use our calculator below to calculate your BMI.

Two adults who are exactly the same height are unlikely to weigh the same amount. This is because body weight depends on factors such as bone structure (small, medium or larger frame), and the proportion of body fat compared to denser muscle.

Body Mass Index (BMI) assesses your weight in relation to your height and can be a useful indicator of whether your weight is above, below or within a healthy range.


BMI Calculator for Australia

What do the results mean?

BMI Chart Australia

BMI Range Category
Below 18.5 Underweight
18.5 – 24.9 Healthy weight
25.0 – 29.9 Overweight
30.0 and above Obese

Source: The World Health Organization


If your BMI falls between 18.5 and 24.9, it indicates you are within the healthy weight range. If your BMI is greater than 25, then you fall into the overweight category. As weight increases above a healthy range, the increased body fat levels are associated with a higher risk of developing health problems such as high blood pressure, high LDL cholesterol levels, type 2 diabetes, coronary heart disease, stroke and some cancers. A BMI below 18.5 is classified as underweight and if the low body weight is a result of restricted food intake, an inadequate nutrient intake is probable.

Is it always accurate? It’s important to understand that BMI is only a guide for healthy weight ranges and health risk in adults – it doesn’t always tell the whole story. People who have higher proportions of muscle, such as athletes and body builders, may be incorrectly classified as overweight. Similarly, people with small frames and lower amounts of muscle mass, including the elderly and some ethnic groups, may be classified as being a healthy weight, despite carrying excess weight for their body type. BMI can be a much better indicator of health status when paired with the Waist Hip Ratio, which considers where the body fat is distributed.

References & More Information

World Health Organisation BMI Classification
Dietitians Association of Australia
Center for Disease Control and Prevention

Latest Articles

Wellbeing

Keeping your kids safe online

How to address and prevent cyberbullying. Read more

Wellbeing

How does nature boost your health and happiness?

Here are a few reasons to bring more nature into your life. Read more

Wellbeing

How to treat tired, dry or itchy eyes

Ophthalmologist Dr Mark Jacobs explains how to find relief. Read more

Wellbeing

The psychology of why travel is so good for you

Why we wanderlust, and how travelling changes us. Read more

Wellbeing

Could an online mental health tool help you?

Black Dog Institute psychologist Dr Peter Baldwin explains. Read more

youtubeui-checkbox-tickui-checkbox-emptyui-checkbox-crosstwitterui-checkbox-tickPage 1Group 10Group 9Group 2sign-up-userArtboard Copynp_phone_503983_000000download_red4xdownload_red4x copyArtboardmember-offer-starLogoMedibank - Logo - ColourOval 5Instagram iconicon-editdownload_red4x copygive-back--spinesgive-back--moneygive-back--massagegive-back--likegive-back--jointgive-back--emailgive-back--dislikedownload_red4xdownload_red4xGroup 5filter-iconfacebookMobile Navcheckcarret-upcarret-rightcarret-leftcarret-downGroup Copy 2arrowarrow-circleanimated-tick