How Much Should a 13 Year Old Weigh?

During their teenage years, it is not unusual for your child’s body to change quite dramatically and in a number of ways also. You want to make sure that your child’s body is developing as well as it should do but at the same time, you don’t want to put your child at risk of all the complications that come hand in hand with being obese.

There are problems with trying to work our whether or not your 13 year old is in a bracket considered to be ‘normal’. There are so many hormones rushing through their body that it can be changing at quite a dramatic rate and because of that, there isn’t one thing generally considered to be ‘normal’. Two people could be the same height but completely different in weight and still be classed as ‘normal’.

There are ways that you can work out whether or not your child is healthy. Let’s take a look:

How much should a 13 year old weigh?

In order to work out how much a 13 year old should weigh, you need to know a few other measurements in order to figure out their BMI or Body Mass Index.

how much should a 13 year old weighDuring puberty, there is a wide ratio of what is considered to be a normal height or weight for a 13 year old and it can range from 4 ft 7 to over 6 ft. Some of this will be down to genetics and other factors will include lifestyle and upbringing, diet, exercise, and more.

Girls tend to mature earlier than boys so they will go through their growth spurts at an earlier age. In 2002, studies showed that the average 13 year old girl was 62.6 inches tall – 5 ft 3 inches. Just one year later, at aged 14, the average height for a 13 year old girl was 63.7 inches or 5 ft 4 inches. A lot of change can happen during this time and for some kids, it might take longer than others.

The average weight of a 13 year old girl is between 82 to 137 pounds. The average seems to sit somewhere between 120-125 pounds.

The average weight of a 13 year old boy is between 80 to 135 pounds. The average seems to sit somewhere between 120-125 pounds.

The average height of a 13 year old now is considered to be 58 to 62 inches for boys and 60 to 63 inches for girls.

Weight will depend very much on a large amount of factors especially at this age. The BMI will be based on their height and weight but things like age will need to be taken into account as well as overall health, the body type or build, and even the percentage of body fat. Not one thing can be used to determine ‘normal’ weight.



Adult averages should never be used to measure teenagers because they are likely to be going through a growth spurt and the measurements could prove to be wrong. This could prove dangerous, either putting them into an overweight category when they shouldn’t be, or in an underweight one. This can affect a number of things and these are the years that correct information about food and eating should be learned, as should correct eating habits. If eating healthy isn’t educated, your 13 year old runs the risk of suffering at the hands of being overweight.

Ensuring Your 13 Year Old Is Fit & Healthy 

If you want to make sure that your 13 year old weighs what they should do, it is important to ensure they are eating healthy and getting the right amount of exercise. It is not advisable to put teenagers on a diet when there is no need because this can affect the way they think about their own body image, causing great emotional and mental problems later on in life. At the same time, it is unwise to leave an obese teenager to carry on with their own habits because it will cause them failures and problems with their health later on in life. There are a number of medical conditions linked with obesity – diabetes, heart disease, strokes, and even bone and circulation problems included.

At 13 years of age, a boy should be eating approximately 2414 calories per day. A girl should be eating slightly less – 2223 calories per day.

These figures are considered to be a guide and the amount of calories may need to be changed to allow for weight gain or weight loss where appropriate.

You should encourage your teenager to be eating healthily and this will include at least five portions of fresh fruit and vegetables per day. With smoothies and other drinks now offering at least one portion of this, there is no excuse. Making your own smoothies for breakfast is one of the easiest ways to increase your healthy food intake.

Low-fat options should be considered at all times, not to restrict food but to give a healthy way of eating foods. Learning what to have in moderation is also important so you should educate your child on this. Sugary, high-fat and calorific foods should only be eating in moderation and the younger you start teaching this lesson, the healthier your child is likely to grow up.



When it comes to exercise, you are advised to encourage your 13 year old to participate in an hour’s worth of exercise most, if not all, days of the week. This could be playing with friends in the park or a lesson of physical activity at school. It could also include walking to and from school as long as there is no dilly-dallying. The more exercise is forgotten about during the younger years, the more it will be forgotten about in the older ones too.

372 COMMENTS

  1. I’m somewhere between 5’2 & 5’3 and weighing between 120-125 pounds. I’m a girl. People always say I’m really skinny and I don’t think I’m bad looking. I just want to know some tips on how to stay at this weight or lose a few pounds?

    • Depending on how close you are to 5’2″ or 5’3″, you should weight between 83.7 lbs to 127.0 lbs, so you are perfectly within the realm of normal. The easiest way to maintain your weight is to eat healthily and exercise a healthy amount. You should also make sure to drink enough water since the mind can confuse thirst and hunger signals easily. Otherwise though, I would not worry too much about your weight because you are perfectly healthy.

    • For that height and age, a healthy BMI would put you between 89.1 lbs to 131.1 lbs. You are almost underweight, but not quite. Eat a balanced diet, exercise and you will may be able to put on a couple of pounds of muscle to bring your weight up in a healthy way. Good luck, Hayley!

  2. I’m 13 years old and I’m 5’2 and I weigh 128 lb but I look very much overweight but according to your website I’m healthy

    • For your height, a healthy BMI is at 83.7 lbs to 123.0 lbs. Many of our average weights in this article do not say specific height-to-weight ratios, which is one of the reasons why the website says your healthy when you are not quite. You are just five pounds over the maximum for normal, so I wouldn’t worry too much. You may also appear overweight if you have a low muscle percentage. A pound of muscle weighs more than a pound of fat. If you have mostly fat and no muscle, then you could even weigh a healthy amount while actually looking overweight and being over-fat. The best way to counteract this is to get plenty of exercise and eat a healthy diet. Even if this does not make you lose weight, the extra exercise will help you to look more toned and in better shape.

  3. Hey! i’m a 13 year old male and my height 5’5 but my weight is 139 but I keep going up and down like 139 then im 141.5 hours later am I obese. I don’t like my body figure i’ve been getting fat though i do participate in P.E everyday and i go walking home everyday for 5 months already

    • Your recommended weight is between 105.0 lbs to 147.6 lbs, so you are decidedly not overweight or obese. Your weight is just fluctuating during the day because of fluid and food intake. You should keep drinking water though because it helps you maintain your weight, boosts your metabolism and ensures that your body is functioning healthily. It takes time to lose weight or get in shape, so be patient. You may want to try calisthenics like push-ups, sit-ups or lunges because the weight-bearing aspect of these exercises will help you gain some of the muscle tone you want. Good luck, Anon!

    • A healthy weight would be between 94.8 lbs to 139.4 lbs. You are perfectly healthy. If you are not happy with your figure, start exercising. There are many exercises that can help to tone your body and give you the figure that you want. Plus, exercise is a healthy part of a balanced lifestyle, so it will be good for your health as well.

  4. i’m 13 and i’m around 5-5’4ft. i weigh 140 pounds but i work out everyday i’ve been gaining more weight recently but i’ve been seeing my body getting skinner. why is my weight so different then my body.

    • At 5’4″, a healthy BMI would put you between 89.1 lbs to 131.1 lbs. You are slightly over this amount, but probably nothing to worry about too much for now. As you worked out, the muscle gains may have increased your weight slightly. Muscle burns far more calories in a day than fat though, so your weight should ultimately balance out. Plus, the extra muscle will help your body to look more toned and healthy.

    • A healthy BMI for your height and age would be between 112.8 lbs to 165.9 lbs. You are almost underweight, so I would really not be concerned about how much you weight right now.

  5. i am a 13 yr old girl and im 5 feet 3.50 inches and i way 110. i get told all the time im over weight by kids at school is this true??

    • A healthy BMI would put you within a weight range of 87.7 lbs to 129.0 lbs. This means you are certainly at a healthy weight, and the other children at your school are just being unusually mean.

  6. I’ma 13 year old male, I weigh around 94 pounds and I’m somewhere between 5’0 and 5’2. Is that overweight? I feel as if I am. Thanks!

    • You are not overweight. You will also be growing taller in the next few years, so you really don’t have to worry.

    • It seems like you may have commented twice on this one. I have to answer each comment individually, so it may sometimes take me a little while to answer them all. If you do not see your response right away, do not worry because you will. Read through my last response and let me know if you have any questions. Thanks for commenting!

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