Height Calculator: How Tall Will I Be? 103

How tall will I be?

By inheriting genes from both parents, a child usually grows to their average height. However, the activity of genes can vary, and so too can growth. And beyond genes, there are environmental factors like wellness, activity, and nutrition. Height calculators can’t possibly take all of this into consideration to answer the question, “How tall will I be?” Instead they really only apply to statistical averages. Nevertheless, it can be interesting to try them out. The second calculator below takes more into account and tends to be more accurate.


Units: imperial metric
Gender: Male Female
Child’s Age:
Child’s Weight:
Child’s Height:
Mother’s Height:
Father’s Height:



Units: imperial metric
Gender: Male Female
Mother’s Height:
Father’s Height:



Height Calculator

The simplest height calculator (second one) draws on the fact that children inherit genes from both parents. It takes the average height of the parents and add 2.5 inches (6.5cm) for boys or subtract 2.5 inches for girls. But if the child’s height trajectory points to a greater height, don’t go hunting down the mailman just yet; with so many genes involved, some of which may be recessive, and the possibility of environmental influences, child height can differ considerably from parental height.

Another popular approach to predicting adult height is to double a boy’s height at age 2 or a girl’s height at age 18 months. While this approach does incorporate the child’s own height, and thus their own genetics, it is over simplified and unlikely to provide an accurate prediction.

The Khamis-Roche Method1 combines the best of both of these methods by looking at both parental height and the child’s height at the current age. Furthermore, it incorporates weight as this too is telling of growth to come. This is the method used by the first height calculator at the beginning of this article.

More advanced height calculators make use of bone age, which is a measure of age based on the size and shape of the bones as seen in radiographs, and formulas such as those found in the Tanner-Whitehouse method. Bone age isn’t always available, and it was actually for this reason that the Khamis-Roche method was developed.

Another method is to calculate height percentile and then check that same height percentile for adults. Similarly, there are also growth charts for analyzing height, but that’s a topic for another article.

While a height calculator may be useful, it is not intended for cases where an underlying height related disorder or syndrome may be present. Additionally, these methods have generally been developed for white American children and thus some prediction accuracy may be lost for other populations. In actuality, a pediatrician or endocrinologist is the best resource when it comes to understanding a child’s height.

[1] Predicting adult stature without using skeletal age: the Khamis-Roche method.

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103 thoughts on “Height Calculator: How Tall Will I Be?

  • Michael

    My son has just reached his 13th birthday and he is 5’10 (an inch taller than me) His mum is only 5’3. I have no idea what final height he will reach. You’re calculator indicated 6’4. If this is the case he is only due to grow 1.2 inches a year over the next 5 years?

  • Anonymous

    Oh wow reading these comments make me feel fat im 16yrs old im 6ft gonna be6ft3 but im 220pounds im not fat though maybe its just my familys genes we are naturally big my cousins 6ft6 and his parents my auntie and uncle are 6ftmale and 5ft8female so maybe ill be taller and no longer feel fat through these comments

  • Colton

    Will I grow more I’m kinda worried I put in the correct stats and it said that I would be 6ft but I have not grown for the past 5 months I’m gonna be 15 in a month so do you think I will grow more and I did use the 1st one

  • Alex

    I turned 13 years old on 10th August. I am now 5’3″ . I grew around 8 inches in the past 2 years. Lately I have only grown 3 cm in 6 months. My mom is 5’4″ and my dad is 5’7″. I want to know whether I will be as tall as my dad.

  • Gaurav

    Nice…I m 16 years old and I m 6’2 . According to this calculator I will 6’2.5 (First calculator),according to second calculator I will 5’10 which is my elder brother’s height.

  • Serafino Diaz-Mazzei

    Test results yielded different results. When I put in 5’8″ when I was 12, it said 6’3″. But now that I put 5’9″ at age 13, it says 6’2″ 1/2. I think I will be much taller than the predicted result because at the rate I’m growing, I could end up at 6’0″ by the time I am a high schooler. The doctor said I would be in between 6’1″ and 6’6″, but my mom doesn’t want me to grow past 6’5″. This other chart said I would be 6’10”. But, I know that I should be happy with the height I get!

  • Mahan

    It was so interesting and great (funny though). My father is 189cm and my mom is 165cm I’m 14.5 and 183.5cm this say I will 194cm. I think myself first calculator is more accurate than second because it says I’ll be 183.3 which I passed that, by the way I’ll be tall because shortest brother of my father is 180cm and tallest is 193cm and my mother’s brother is 187cm both my grandfathers is 183 so I think I’ll be more taller than 194cm. It’s really depends on genes and sports activities. I read somewhere some sports like basketball,volleyball,swiming and etc will increase your height 7cm but I’m not sure about that.

  • Anonymous

    The first method is very accurate! I’ve used that to gauge my kids growth in the last few years and it’s on pointe for our kiddos. They are 15 and 13, late bloomers, but tracking their current height and weight in conjunction with parental stats produces very accurate results. Only inputting parental stats is very inaccurate! My kids already surpass the predicted height based on just parental height. In our case, I’m petite and my husband is tall. The kids are NOT an average of us. They inherited their fstjer’s height. It could have gone either way. That is why it’s important to gauge their current growth pattern and percentiles. Additionally, baby measurements are not a good predictor because of varying growth rates. My babies were tiny! Now, my 13 year old is in the 97th percentile. So, gauging them between 10-15 is probably the most accurate. HTH!

  • Anonymous

    Put it like this: You know how a long- term forecast is not accurate? Well, that’s because it predicts 3 days ahead. Short- term calculators predict the weather a day ahead. Which tends to be more accurate than the other forecast.If the calculator predicts you at 6’9, you will be a little shorter than that. If it predicts you at 5’10 you’ll probably be around there. Another reason why you might not end up at that height is because of your age. Let’s say I’m 11 and 8 months. The calculator says I’m going to be 5’11, that’s probably off by a little. This is because the further away your age is at from the point where you stop growing, it will be off by a a couple inches. You’d probably minus or add a few inches though. For instance, if I have a balanced, consumed diet, then I would add an inch or two to my predicted adult height. If I’m very active, then I would add another couple inches to my height. Combined, I wouLd be very tall. If I was active, but did not have a good diet, then I would just add a couple inches only to my predicted adult height. If I’m weeek on both, you lose the argument.

  • Anonymous

    wow! So i am 14 in a half and i would love to be a Victoria’s Secret model. There is a required height {min: 5’7} to be qualified to be one. Right not i am 5’6. and the height that i am going to be as an adult is about 5′ 9.2. Which is pretty tall.

  • Anonymous

    I am 14 and 4 months and i am 5’9.5-5’10 which is pretty tall from what i heard. my younger brother who just turned 13 is 5’10.5. so he is taller than me and is supposed to be 6’0 by the end of the year. most people would be jealous but i am happy i have a tall bro to back me up. The calculator predicted him to be 6’6-6’7 by the end of his growth and for me it was 6’3-6’4 which is as accurate as can be, because my doctor predicted the same height last year when we went for a checkup. Me and my brother are extremely happy. My mom is 5-9 to 5’10 which is giant for a woman and my dad is 5’11 which is average. i was told the only reason why we will be tall is because our grandpa is 6’7-6’8 and we both play basketball. So NBA here we come. All my dad’s siblings are taller than 6 feet including the women and my my mom’s father is 6’2 and her mom was 5-10 so again pretty tall.