This calculator measures body mass index (BMI), which is a measure of body fat. It is only an approximate measure of the best weight for your health. The calculator can be used for anyone from two to 20 years of age.

Please note:

  • Always see your doctor if you are concerned about your child's growth.
  • The BMI is used to assess whether a person is underweight, normal weight, overweight or obese.
  • As children grow, their amount of body fat changes and so will their BMI. That's why a BMI calculation for a child or adolescent must take into account their age and gender (we do this using percentile charts).

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Last updated: January 2016

Content on this website is provided for education and information purposes only. Information about a therapy, service, product or treatment does not imply endorsement and is not intended to replace advice from your doctor or other registered health professional. Content has been prepared for Victorian residents and wider Australian audiences, and was accurate at the time of publication. Readers should note that, over time, currency and completeness of the information may change. All users are urged to always seek advice from a registered health care professional for diagnosis and answers to their medical questions.