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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.

Calculate your BMI here
 

BMI = Weight (kg) /
    Height (m) x Height (m)
  = 65kg
    1.7m x 1.7m
  = 65kg
    2.89
  = 22.5kg/m²


BMI classifications

New Zealand Europeans

Underweight: less than 18.5
Healthy: between 18.5 and 24.9
Overweight: between 25 and 29.9
Obese: 30 and above

Maori and Pacific Islanders

Underweight: less than 18.5
Healthy: between 18.5 and 25.9
Overweight: between 26 and 31.9
Obese: 32 and above

Asians and Indians

Underweight: less than 18.5
Healthy: between 18.5 and 22.9
Overweight: between 23 and 24.9
Obese: 25 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) (NZDA 2007 Clinical Handbook)