BMI
Body Mass Index (BMI) uses height and weight measurements to determine whether a person is underweight, a healthy weight, overweight or obese. BMI is calculated by dividing weight (kg) by height (m) squared.
BMI |
= |
Weight (kg) |
|
|
|
Height (m) x Height (m) |
For example, a woman 1.7m tall weighing 65kg has a BMI of 22.5
|
BMI |
= |
65kg |
|
|
|
1.7m x 1.7m |
|
|
= |
65kg |
|
|
|
2.89 |
|
|
= |
22.5kg/m² |
BMI Classifications
|
Underweight: |
less than 18.5 |
|
Healthy: |
between 18.5 and 24.9 |
|
Overweight: |
between 25 and 29.9 |
|
Obese: |
30 and above |
A BMI in the healthy weight range is associated with the lowest risk of disease.
Note: BMI should be used as a guide only and is not appropriate for people under the age of 18 years, very muscular people, pregnant women or those who are very short (<1.5m) or very tall (>1.9m)
Waist Circumference
Many people are familiar with the Body Mass Index (BMI) but there is more and more evidence suggesting waist measurement is a better way of showing whether your weight is endangering your health.
|
|
Waist measurement not more than: |
|
NZ European, Pacific Island & Maori Men |
102cm |
|
NZ European, Pacific Island & Maori Women |
88cm |
|
Asian and Indian Men |
90cm |
|
Asian and Indian Women |
80cm |
If your waist measurement is greater than those listed above you are at increased risk of cardiovascular disease and developing type 2 diabetes. If you have concerns about your BMI or waist circumference, please discuss these with your doctor or a registered dietitian.