Healthy weight calculator for children and teenagers

It’s not always easy to tell if a child is a healthy weight for their age and height.

Children and teenagers need to grow, but they are healthiest if they stay within a certain weight range as they grow. This is called a healthy weight for their age.

How do I know if my child or teenager is healthy weight?
You can find out if a child or teenager is a healthy weight for their age using the healthy weight calculator.

Who is the healthy weight calculator for?
This calculator can be used for children and teenagers from 2 years through to 18 years of age.

If you are over 18 years, you can use an adult calculator to find out whether you are a healthy weight.

Weight status calculator for children and teenagers

Calculate body mass index for anyone aged 2 to 18 years

1 Details of child

2 Measurement results

cm To nearest 0.1cm
kg To nearest 0.1kg

3 Find out your results

Please fix the issues below and try again.

    Weight category based on the result

    Your results suggest the child measured is

    Below a healthy weight Healthy Above a healthy weight Well above a healthy weight

    based on an year old at kg and cm.

    Below a healthy weight Healthy Well above a
    healthy weight

    The results explained:

    The result suggests your child is underweight for their age and height.

    Low weight for height and age can occur for many reasons. If your child is underweight or not growing, take them to see your GP or other health care provider.

    Children’s growth can change over time, so it’s important to check your child’s height and weight every three months.

    Check the measurements you have entered and if you are concerned, talk to your GP or other health care provider about your child’s growth.

    Keep records of your child’s height and weight, and regularly take your child to your GP or other health care provider to monitor their growth.

    The result suggests your child is underweight for their age and height.

    Low weight for height and age can occur for many reasons. If your child is underweight or not growing, take them to see your GP or other health care provider.

    Children’s growth can change over time, so it’s important to check your child’s height and weight every three months.

    Check the measurements you have entered and if you are concerned, talk to your GP or other health care provider about your child’s growth.

    Keep records of your child’s height and weight, and regularly take your child to your GP or other health care provider to monitor their growth.

    The result suggests you are underweight for your age and height.

    Talk to your GP or health care provider about your weight.

    Growth can change over time, so it’s important to check your height and weight every three months.

    Check the measurements you have entered and if you are concerned, talk to your GP or other health care provider about your weight.

    The result suggests your child is a healthy weight for their height and age.

    Being a healthy weight is good news. Remember, it is important for children to eat a healthy and varied diet and to be physically active for at least an hour each day.

    Children’s growth can change over time, so it’s important to check your child’s height and weight every three months.

    The result suggests your child is a healthy weight for their age and height.

    Being a healthy weight is good news. Remember, it is important for children to eat a healthy and varied diet and to be physically active for at least an hour each day.

    Children’s growth can change over time, so it’s important to check your child’s height and weight every three months.

    The result suggests you are a healthy weight for your age and height.

    Being a healthy weight is good news. Remember, it is important to eat a healthy and varied diet and to be physically active for at least an hour each day.

    Growth can change over time, so it’s important to check your height and weight every three months.

    The result suggests your child is above a healthy weight for their height and age.

    Children above a healthy weight may develop health problems in childhood, such as asthma; sleep problems; hip, knee and ankle problems; and high cholesterol or blood pressure.

    Children who are above a healthy weight are also much more likely to become overweight adults, putting them at risk of health problems like heart disease, diabetes and cancer.

    You can do a lot to help your whole family develop healthier eating habits, and keep them active and well.

    Children’s growth can change over time, so it’s important to check your child’s height and weight every three months.

    The result suggests your child is above a healthy weight for their height and age.

    Children above a healthy weight may develop health problems in childhood, such as asthma; sleep problems; hip, knee and ankle problems; and high cholesterol or blood pressure.

    Children who are above a healthy weight are also much more likely to become overweight adults, putting them at risk of health problems like heart disease, diabetes and cancer.

    You can do a lot to help your whole family develop healthier eating habits, and keep them active and well.

    Children’s growth can change over time, so it’s important to check your child’s height and weight every three months.

    The result suggests you are above a healthy weight for your height and age.

    This means you weigh more than is healthy for someone of your height, age and sex. Being above a healthy weight can put you at risk of poor health as an adult.

    There are many easy changes you can make and there is lots of support for a healthy lifestyle available.

    Growth can change over time, so it’s important to check your height and weight every three months.

    The result suggests your child is well above a healthy weight for their height and age.

    Children above a healthy weight may develop health problems in childhood, such as asthma; sleep problems; hip, knee and ankle problems; and high cholesterol or blood pressure.

    Children who are above a healthy weight are also much more likely to become overweight adults, putting them at risk of health problems like heart disease, diabetes and cancer.

    You can do a lot to help your whole family develop healthier eating habits, and keep them active and well.

    Children’s growth can change over time, so it’s important to check your child’s height and weight every three months.

    The result suggests your child is well above a healthy weight for their height and age.

    Children above a healthy weight may develop health problems in childhood, such as asthma; sleep problems; hip, knee and ankle problems; and high cholesterol or blood pressure.

    Children who are above a healthy weight are also much more likely to become overweight adults, putting them at risk of health problems like heart disease, diabetes and cancer.

    You can do a lot to help your whole family develop healthier eating habits, and keep them active and well.

    Children’s growth can change over time, so it’s important to check your child’s height and weight every three months.

    The result suggests you are well above a healthy weight for your height and age.

    This means you weigh more than is healthy for someone of your height, age and sex. Being above a healthy weight can put you at risk of poor health as an adult.

    There are many easy changes you can make and there is lots of support for a healthy lifestyle available.

    Growth can change over time, so it’s important to check your height and weight every three months.

    Email your results

    Send these results to your inbox to save them for later or to start a discussion with a health professional

    What can you do?

    Go4Fun® is a healthy lifestyle program for children aged 7-13 years who are above a healthy weight, and their families. Programs are run during school term and are led by trained, qualified health professionals.

    Learn more

    Join the Get Healthy Service (16 years and over)

    Free personalised telephone coaching to help improve eating habits, physical activity levels, and to achieve and maintain a healthy weight.

    Learn more

    Munch & Move

    Munch & Move is a fun, play-based program that supports the healthy development of children aged birth to five years by promoting physical activity, healthy eating and reduced small screen time. The program provides training and resources to educators working in NSW early childhood education and care services.

    Families can access fact sheets with information to make healthier choices.

    Learn more

    Now you have your result, what do you do?

    Here are eight ways to help your child and familyyou maintain a healthier lifestyle:

    Drink water instead of soft drink or cordial.

    Eat 5 serves of vegetables and 2 serves of fruit every day.

    Start each day with a healthy breakfast.

    Know your portion serve/size.

    Choose healthier snacks and fewer treat foods.

    Be active for at least an hour every day.

    Limit screen time (no more than one hour a day for 2-5 yrs; no more than two hours a day for 5-17yrs).

    Get enough sleep (10-12 hours a night for under 12yrs; 8-10 hours a night for over 12yrs).

    8 healthy ways to a healthy lifestyle

    Visit makehealthynormal.nsw.gov.au for recipes, tips and tools to support you and your family with healthy eating and being active.

    Learn more

    Dietary patterns in a table format provide the nutrients and energy needed for all children and adolescents of average height with sedentary to moderate activity levels.

    Learn more

    The Australian Dietary Guidelines inform people of different ages, life stages and gender, the minimum number of serves from each food group they need to eat each day, to make sure they get the full amount of nutrients their body needs.

    Learn more

    Children learn by example. One of the best ways to help your child be active and eat well is for you and your family to do it too.

    Learn more

    Talk to your local GP or other health care provider if you are concerned about your child’s growth.

    Weight category based on the result

    Weight category based on the result

    Supporting Information

    Children need to grow, but they are healthiest if they stay within a certain weight range for their height and age as they grow. This is called a healthy weight for their age.

    Children above a healthy weight may develop health problems in childhood such as asthma, sleep problems, hip, knee and ankle problems and high cholesterol or blood pressure.

    Children who are above a healthy weight are also much more likely to become overweight adults, putting them at an increased risk of health problems like heart disease, diabetes and cancer.

    It is recommended you accurately measure your child’s height and weight every three months, and use the healthy weight calculator to find out whether your child is at a healthy weight. Record the measurements over time, so that you can discuss them with your GP or health care provider.

    1. The healthy weight calculator uses your child’s height and weight, to calculate a body mass index (BMI).
    2. The calculator then plots your child’s age and BMI on the US Centre for Disease Control’s BMI for age chart for girls or boys, and uses the chart to determine whether the child is a healthy weight for their age.
    3. The calculator can also describe this as a percentile. Your child is a healthy weight if their BMI for age and sex is from the 5th to below the 85th percentile. A child below the 5th percentile is below a healthy weight (underweight), and a child at the 85th percentile and above is above a healthy weight.

    The weight status calculation for children and teenagers is based on the BMI-for-age charts developed by the US Centres for Disease Control and Prevention (CDC 2000). These charts are designed specifically for children from 2 to 18 years of age, and the charts are recommended for use in Australian children aged 2 to 18 years.  These are the charts your GP or health professional uses.

    Weight Category Percentile Range
    Underweight Less than the 5th percentile
    Healthy Weight 5th percentile to less than the 85th percentile
    Above a healthy weight 85th to less than the 95th percentile
    Well above a healthy weight Equal to or greater than the 95th percentile
    1. Take the height measurement on hard flooring (i.e. without carpet) and against a flat wall.
    2. Remove shoes and socks, bulky clothing and hair accessories.
    3. Have the child stand straight with back against the wall. Make sure feet are flat, heels are touching the wall and eyes are facing straight ahead (see illustration).
    4. Place a pencil/book horizontally on the top of the head.
    5. Draw a small mark where the pencil meets the wall (don’t forget to wipe it off when you are finished).
    6. Using a tape measure, measure the distance from the pencil mark on the wall to the floor.
    7. Record the measurement to the nearest 0.1 centimetre.

    Download PDF: Guide to accurately measuring the height of a child

    Measuring a child’s weight:

    1. Place scales on hard surface (such as tile or wood) and avoid placing on carpet. If possible, use a digital scale.
    2. Remove shoes and heavy clothing (like a jacket or thick jumper).
    3. Have the child stand with both feet in the centre of the scale.
    4. Record the weight to the nearest 0.1 kg (or ½ kilogram if not using digital scales).

    TIP: If possible, weigh the child first thing in the morning before breakfast. If you intend to repeat the measurement in future, try to repeat it at the same time of day. Remember weight can vary across the day.

    Please note:
    This calculator provides a general guide to healthy weight in children and teenagers. It is not intended to be a substitute for advice from a health professional. See your GP or local health professional if you are concerned about your child's growth or development.