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What is the average height and weight for a 7th grader?

What is the average height and weight for a 7th grader?

This informative guide will tell you the average 7th grader height and the average 7th grader weight so that you can gauge how much a seventh grader should weigh and how tall they should be.

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What is the average height for a 7th grader?

A person getting measured to see if they have an average height for a 7th grader

What is the average height for a 7th grader? According to US measurement data, the average height of a 7th grader boy and girl is 5 foot 1 inch tall.

During 7th grade, most boys and girls are roughly the same height, and there’s a good chance that some girls may actually be taller than their male peers. 

This is because many girls have already begun puberty by the time they reach seventh grade whereas, on the contrary, many boys are only just starting to experience puberty during seventh grade.

Since the previous grade, both 7th grade boys and 7th grade girls will, on average, have gained around 2 inches of height. 

Between grades seven and eight, however, boys will typically get around 3 inches taller, whereas girls will only get around an inch taller. The period between the 7th and 8th grade is commonly a period of rapid physical development for boys.

What is the average weight for a 7th grader?

A girl seeing if she has an average weight for a 7th grader

What is the average weight for a 7th grader? Based on the weights of hundreds of American seventh graders, the average weight of a 7th grader is 107.8 pounds for 7th grade boys and 116.9 pounds for 7th grade girls.

So, during 7th grade, girls are, on average, 9 lbs heavier than boys despite being the same height. This may be because 7th grade boys have not yet accumulated significant amounts of muscle mass, although this will likely change the following year.

Indeed, between grades 7 and 8, boys will typically gain around 25 lbs of body weight, whereas girls will only put on an additional 9 lbs of body mass.

After grade 7, the height and weight trend for males and females tends to reverse; boys become both taller and heavier than their female peers. This is because their bones are lengthening, and their muscles are growing at a very fast rate.

How much should a 7th grader weigh to be healthy?

A boy standing on some weighing scales

Now that you know the average weight for a 7th grade girl and a 7th grade boy, you might be asking yourself: Can a 7th grader weigh more than average and still be healthy?

The answer to that question is a resounding yes.

Although health isn’t just about the numbers on the scale, research shows that seventh graders with a healthy weight and good cardiorespiratory fitness levels are more likely to achieve academically than their overweight and sedentary peers.

However, weighing slightly more than normal doesn’t mean that a 7th grader is overweight, especially not if they’re taller than average as well.

During puberty, height and weight always increase together. So it’s perfectly normal for some children to weigh a lot more than others if they’re taller or just happen to have a larger bone structure. 

Why does 7th grader height vary so much?

Some boys showing how tall the average 7th grader is

The short answer is genetics.

In any class, there are bound to be some tall children and some short kids. However, most students tend to fall somewhere in between the tall and short categories.

Additionally, since children (even those of the same gender) can often begin puberty at different ages, some children will naturally have grown much taller than others.

Similarly, if two children are in the same grade but one of them has an early birthday while the other has a very late birthday, then the child with the early birthday will most likely be taller than their younger classmate purely because they’ve had months more opportunity to grow.

This isn’t, of course, to say that short 7th graders can’t catch up to their taller peers. Indeed, those who begin puberty later may also continue to grow for longer. 

And since the period between grades 7 and 8 is usually a crucial one for physical development—especially for males—many children can look radically different in the space of a year.

How old are 7th graders in the USA?

How old are 7th graders in the USA? In America, 7th graders are between the ages of 12 and 13. The precise age—whether they’re twelve or thirteen—depends on their birthday.

In British schooling, grade seven is equal to year 8, which is a child’s second year of secondary education. In general, to convert US and UK school years, you just add one to the US grade number to get the UK year number.

Conclusion: Why is knowing the average 7th grader height and weight useful?

The average 7th grader height and weight are more than just trivial facts that will satisfy your curiosity. 

Indeed, knowing the average height of a 7th grader, for example, can help you to assess your child’s physical development so that you can make sure that they’re growing properly.

Additionally, since seventh graders with greater aerobic fitness levels tend to achieve better academically than more sedentary children (better fitness usually correlates with a healthy body weight), knowing the average weight for a 7th grader is also important.

So, while some seventh graders will naturally be taller or shorter or heavier or lighter than their peers, these averages are useful for understanding what a typical 7th grader looks like.


  1. Grades 7-9: Tips for Supporting Learning at Home. Child Mind Institute.
  2. Sardinha, L. B., Marques, A., Martins, S., Palmeira, A., & Minderico, C. (2014). Fitness, fatness, and academic performance in seventh-grade elementary school students. BMC pediatrics14, 176.
  3. Wittberg, R. A., Northrup, K. L., & Cottrell, L. A. (2012). Children’s aerobic fitness and academic achievement: a longitudinal examination of students during their fifth and seventh grade years. American journal of public health102(12), 2303–2307.