What is your BMI?

Use our BMI calculator to give you an idea of whether you're underweight, overweight or a healthy weight for your height. Being a healthy weight can be a challenge, but the benefits are huge. BMI stands for Body Mass Index.

Use our BMI calculator to find out your Body Mass Index

Enter your height and weight

One way of calculating if you are a healthy body weight is to know your body mass index (BMI). BMI is calculated using a person's weight and height. Your BMI gives you an idea of whether you're underweight, overweight or an ideal weight for your height. It is used as a tool to identify possible weight problems in adults. 

Underweight = <18.5

  • This result means that you may be underweight. Being underweight can be associated with a range of health issues. If you are concerned about your weight, we recommend discussing your result with your GP or a dietitian.

Normal weight = 18.5–24.9 (25.9 for Maori and Pacific Islanders)

  • This result means that you are a healthy body weight. Keep up the great work!

Overweight = 25–29.9 (26 - 32 for Maori and Pacific Islanders)

  • This result means that you may be overweight. Carrying extra weight is associated with a range of health concerns, including being at an increased risk of heart disease. If you are concerned about your weight, we recommend discussing your result with your GP or a dietitian.

Obesity = BMI of 30 or greater (32 or greater for Maori and Pacific Islanders)

  • This result means that you may be obese. Obesity is associated with a range of health concerns, including being at an increased risk of heart disease. If you are concerned about your weight, we recommend discussing your result with your GP or a dietitian.

The BMI is a useful measurement for most people over 18. But there are limitations to this system. For instance:

  • Adults with a very athletic build (eg, professional athletes) could show as overweight. This is because muscle weighs more than fat and the BMI does not take this into account.
  • Those of Maori / Pacific Island decent have different cut-off values than those of European decent
  • If you’re pregnant, the BMI does not apply. You should seek advice from your doctor or midwife on what a healthy weight is.
  • See your doctor if you require a more precise reading.
Losing five to ten percent of your weight can lower blood pressure, improve cholesterol levels, and help protect against diabetes and cancer.

Losing weight and keeping it off is about eating wellmoving more, and instilling lifelong healthy habits.

Find out more about losing weight