What is the Average Weight for 13 Year Olds?

A fitness conscious person measuring her weight using weigh machine
gettyimages/maya23k

Explore this guide for a detailed analysis of average weight for 13 year olds, various weight percentiles for boys and girls, BMI information, and more.

If your child is 13 years old, they would be entering the most exciting, confusing, and volatile phase of their lives, filled with physical and psychological transformations. As a parent, you should be aware of the average range of height and weight changes that might occur during these years.

The average weight for girls falls between 76 and 148 pounds, while for boys, it falls between 75 and 145 pounds. But that doesn’t mean that teens who don’t fall into these weight ranges are underweight or overweight. Just make sure that your teenager eats a healthy and nutritious diet, performs teenage-friendly exercises regularly, and lives an active healthy lifestyle. This will ensure that they grow to their optimum height and have a healthy weight.

Read on for a detailed analysis of the average weight for 13 year olds, weight percentiles for boys and girls, body mass index (BMI) information, and more. Since there is a unique timeline that follows for each child, there is a wide range of standard weights for both boys and girls.

Average weight for 13-year-olds: Boys

According to the  Centers for Disease Control and Prevention (CDC) [1]Centers for Disease Control and Prevention: CDC Growth Charts for Boys: United States, the average weight for a 13-year-old boy is between 75 and 145 pounds. One of the most common growth charts to measure a child’s growth in terms of size and weight is the Body Mass Index-For-Age Percentile Chart. The table given below shows the weight percentiles for 13-year-old boys. If your child belongs to the 25th percentile, that means 75 out of 100 teen boys weigh more and 25 boys weigh less.

Weight percentiles for 13-year-old boys
5th percentile75 lbs
10th percentile80 lbs
25th percentile89 lbs
50th percentile101 lbs
75th percentile116 lbs
90th percentile132 lbs
95th percentile145 lbs

Average weight for 13 year olds: Girls

According to the  Centers for Disease Control and Prevention (CDC) [2]Centers for Disease Control and Prevention: CDC Growth Charts for Girls: United States, the average weight for a 13 year old girl is between 76 and 148 pounds. You can use the Body Mass Index-For-Age Percentile Chart to measure the size of your teen girl. The table given below shows the weight percentiles for 13 year old girls. If your child belongs to the 50th percentile, that means 50 out of 100 teenage girls weigh more and 50 weigh less.  

Weight percentiles for 13-year-old girls
5th percentile76 lbs
10th percentile81 lbs
25th percentile89 lbs
50th percentile101 lbs
75th percentile117 lbs
90th percentile135 lbs
95th percentile149 lbs

BMI Percentiles

To determine whether your child is overweight, calculate his or her BMI, using height and weight to calculate body fat. Use a body mass index percentile chart to show where a child lands among a spectrum of kids his or her age. For example, if a child’s BMI is in the 75th percentile, 75% of the kids of the same gender and age who are measured have a lower BMI.

The categories that describe a child’s weight are:

  • Underweight: BMI < the 5th percentile.
  • Healthy weight: BMI ≥ the 5th percentile and < the 85th percentile.
  • Overweight: BMI is ≥ the 85th percentile and < than the 95th percentile.
  • Obese: BMI is  ≥  the 95th percentile.

When BMI calculations are based on sex and age, they are referred to as “BMI-for-age.” You can refer to the chart given below to understand your teen’s weight status.

Source: WHO [3]World Health Organization: BMI-for-age Boys

Source: WHO [4]World Health Organization: BMI-for-age Girls

Remember that BMI is not the ultimate measure of healthy body weight. Children can have a high BMI if they have a lot of muscle or have a large frame.

What is overweight for a 13 year old?

You can use a child and teen BMI percentile calculator to calculate your teen’s BMI. Just enter your child’s age, sex, weight, and height. The result will indicate whether your kid is overweight or not. 

If your child’s BMI is greater than or equal to the 85th percentile but less than the 95th percentile, he or she is considered overweight. 

What is underweight for a 13 year old?

From the above tables, you can easily find out whether your teenager is underweight or not. If your child’s BMI is less than the 5th percentile, he or she is underweight. 

What factors affect the body weight of a 13 year old?

There are certain important factors that influence body weight for young teens. These are:

Genetics

The body composition of a child, including teens, is influenced by genes. This is why people from different backgrounds and races have different body compositions that eventually affect their weight and other physical attributes. 

Puberty and development

Puberty is the time when children’s bodies develop for physical, sexual, and reproductive maturation. In some teens, puberty can hit as early as age 8, for others, it may not begin until they enter their mid-teens. Girls tend to hit puberty between the ages of 8 and 13 and boys between the ages of 9 and 14. 

Since each child’s body follows a unique timeline, the height and weight range can vary broadly among teens. Noticeable weight gain may occur among teenagers during puberty. Boys can develop more muscle mass, while girls tend to develop more fat in the buttocks and thighs.

Height and body composition

Your child’s body composition can affect how much they weigh. If your child is tall, he or she will weigh more and vice-versa. Also, bone density and muscle mass are other factors that affect one’s body weight. This is because bones make up around 15% of the total body weight of an individual. And muscle fat can contribute to body weight. If a child is muscular, he or she will weigh more than one with lesser muscle mass.

You can refer to a height and weight chart to know the height and weight ranges of your teen. Height-to-weight ratio charts provide healthy weight ranges for kids.

Geographic location

The place where a child grows up will also affect height, weight, and other physical attributes. This is because demographics along with factors like socioeconomic status and other environmental factors, influence their eating behaviors and health patterns. 

How to maintain a healthy weight for 13-year-olds?

Once you have determined the average weight for 13-year-olds, you can help your kids maintain a healthy weight with diet and exercise. Encourage them to develop healthy eating habits and get physically active. You will also want them to ditch unhealthy habits like too much screen time, not sleeping on time, and so forth. The goal is not to get a perfect teenage body but to reduce health risks like childhood obesity. 

Maintain a healthy weight with diet

To help maintain a healthy weight for kids and prevent health problems, you should encourage them to:

  • Consume lots of whole grains, fresh fruits, and vegetables.
  • Eat lots of lean protein, such as lean meat, eggs, legumes, and nuts.
  • Eat or drink non-fat or low-fat dairy products.
  • Limit the consumption of sugar, salt, saturated fats, and refined carbs.
  • Eat lots of fiber-rich foods.
  • Drink plenty of water or unsweetened and healthy beverages.

Maintain a healthy weight with exercise 

To achieve a healthy weight range and lose belly fat, teenagers should:

  • Engage in moderate-to-vigorous physical activity for about an hour every day.
  • Take up any aerobic exercise, such as running, cycling, biking, or swimming.
  • Take up bone-strengthening activities such as jumping or skipping rope and climbing.

When to see a doctor?

Overweight teens are more prone to developing health problems such as obesity and high cholesterol. Similarly, underweight teenagers may have a compromised immune system. If your teens are unable to achieve a healthy weight, talk to a registered dietitian, nutritionist, or doctor. A trained healthcare provider can assess your child’s body mass index and, keeping certain factors in mind, devise solutions for a child’s weight loss or weight gain problems. 

Conclusion

Average weight percentile chart or a percentile calculator helps to understand the average weight of 13-year-olds. This will help you assess whether your teenage child is overweight or underweight and know the potential for weight-related health problems. Parents or guardians who have concerns about a teen’s weight or physical development should seek help from a certified health professional before jumping on to any dietary or lifestyle changes or modifications.

References

References
1 Centers for Disease Control and Prevention: CDC Growth Charts for Boys: United States
2 Centers for Disease Control and Prevention: CDC Growth Charts for Girls: United States
3 World Health Organization: BMI-for-age Boys
4 World Health Organization: BMI-for-age Girls

Similar Posts