Height Calculator: How Tall Will I Be? 102

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. A height calculator can’t possibly take all of this into consideration. However, height calculators are still useful for approximately answering the question, “How tall will I be?”. Please note that the first height calculator below tends to be more accurate than the second.

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

  • Kristian Mejer Hunderup

    i put in my saved stats from when i was 14, and it hit the mark straight on, so yeah its an approximate, but im my case a pretty damn good one

    • Tall Sam

      Nice. My height while I was growing up was marked on a doorway but then it got painted over. Still have a picture, but that might be a bit tricky to extrapolate!

    • Kristian Mejer Hunderup

      i have a few stages of growing up where my height got inprinted on my brain, at 13 when i got a new passport photo. and at 14 when i had my confirmation. but i only remember the height, the weight i had to estimate

    • Tall Sam

      The second one isn’t influenced by which genes where actually inherited nor their expression nor environmental factors thus far in a child’s life, so it can be way off. It was way off for me too.

  • Margie Halloran

    Hmm, the one with the child’s known height and weight predicted me at 6’11”. The one with mom and dads height alone said I would be 5’9″. I’m 6’4″, and I call BS on this calculator…

  • Grace Gniazdowska

    My parents were not very tall, my father was 6′ and my mom is 5’7 but all my uncles on my father’s side and their children, including girls were very tall. My father’s oldest brother was 2 meters.

  • zeeshan

    Hii excellent website.
    One Question
    How you set properly featured page images in home page? I am using this template but the feature page images cropping not set properly

    • Tall Sam Post author

      I’ve heard that can be an issue. I would upgrade to a different slider if you are having problems. I will be using Master Slider at some point probably.

  • anon anon

    wait, so according to the first one, I should be about 5.9 and the second one says I’ll only be about 5.5…which one do you think is more accurate? I mean i could just be fat and thats why its tall but IDK

  • lerenso

    according to this calculator i should be 5’9 (1st) one
    and 5’8.5 (2nd) one. im currently 13 weigh 102 (approx) and am 4’11-5’0 hope i grow all other classmates are tall!

  • mjohnsy181

    The first one said I will be 172.9 cm and the second one said I will be 161.1 cm so I don’t know which one to believe. It said the first one was more accurate, which I believe to be more logical as it has you put in your age and your current height.

      • Hamza

        Hey buddy im currently 14.3 years old i put in 14.5 years old and 35 lbs i ak 5″4 so i put that in and my mom is 5″4 as well i put that in my dad is 5″7 i put that in im a male then i calculated it sayd 5″9 i will be glad i will get 5″9 but is it true???

  • Jamie bot

    Predicted adult height: 336cm
    I said my mum was 164cm and my dad 172cm
    Did they really just add their heights together?
    Okay then..

  • Alex

    My predicted height is 6’3.5″, I really hope this happens. I just turned 14 and I’m 5’7″, I just started my growth spurt

  • Anonymous

    the first one says ill be 189.9(6.2-3) while the second one says ill be 181(5.11),by the way am 13.7 and 5.7
    my mother is 5.6 and father 5.11-6 ft. which one do u think is more reliable

  • Anonymous

    According to the first calculator, it said that I will be about 6.2 to 6.3 . I am currently 13 and 5.7 and 64 kg. Is this accurate or not?

  • shreyarajaram444

    I’m 12 and I’m 152 cm’I used the first one and I got 177.8 cm,but my parents are really short.My mom is 153 cm and my dad is 165 cm.

  • Zachary

    Hi my names is Zachary I’m only 5″3 and I’m only 16 years old I was wondering is there any chance that I will continue growing

  • Ashish Gulaguli

    The first calculator said i will be 6’2″ while the second said i will be 5’7.5″!But for the present i have already crossed 5’7.5″.I am somewhere between 5’8″ and 5’9″

  • Lelthelel

    so my mom is 163cm(5foot 4) and father 174.5( 5 foot 9 basically) and im 176 at age 15.5 and weight like 170 pounds so what height can i reach like do i have a good chance to reach 183cm(6foot tall) the only thing that i havent got yet from puberty is a deep voice and chest hair and i still dont shave cause i dont have a beard and my face looks like im 13-14 do i have a good chance at reaching 6 foot tall

  • Shania Campbell

    I’m 15 and i’m 5’8 but my mom is 5’4 and my dad is 6’2 and the thing said I’ll be 5’10 and the second one said 5’6

  • Lisa Loffelmacher

    I just did this for both my kids. I used their height when they where 4. My son is almost 19 and he is 6’6 which is exactly the height predicted. When I put in my daughter who is 13, I entered her height at 4 and currently. It gave me 6’1 which is the same height we have been told by doctors. She is currently 5’71/2. I wish I had my information from when I was a kid so I could see if my results are accurate.

  • Eve Talbott

    Wow! I know that I might be a little bit shorter or taller, but it said when I’m a adult I would be 5’10.6! I was always told that I would be short because my parents are, so this made my day!

  • Kailey

    I have a question, I used the top calculator and got 5’11.6 but then o used the bottom one and I got 5’3, and I’m already 5’2 and only just a pre teen, so which calculator should I trust more?

  • piter

    I am 14 years old and im 180 cm tall this calculator says that I will be 193.I hope so ot would be like that cuz im into basketball

  • 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.