How to predict your child’s adult height as he/she grows up using our height calculator or simple call it height predictor.

How tall will my child be when he grows up?

Child Height Calculator - Height Predictor

There are many burning questions on the factors that determine the human height and what else influences height growth. More and more parents want to know how tall their child will be even before the toddler starts walking. So can height be predicted in advance? Are the height predictors accurate? That and much more in the post below that tries to answer your question: how tall will my child be.

Use the Height Calculator below to help determine how tall your child will be as he/she reaches adulthood using both the mothers and fathers height – The mid-parental child height calculator.

Child Height Calculator – Height Predictor

Height Calculator

Child's Predictable Height Result


Disclaimer: Please note that the calculations produced by this tool do not pretend to be 100% accurate. It is intended solely for general information and education purposes. The creator of this calculator is in no way liable of any actions which might be taken by users of this calculator.

Mid-Parental Child Height Formula

The mid-parental child’s height formula is at the moment the easiest way of calculating a child’s height solely based on the child’s parent’s height. See below how this is worked out:

  • First calculate the mid-parental height:

(mother’s height + father’s height)/2

  • To get a girl’s future height, subtract 2.4 inc (6 cm) from the above mid-parental height result:

Girls Predictable Future Height = mid-parental height – 2.4 inc (6 cm)

  • To get a boy’s future height, add 2.4 inc (6 cm) from the above mid-parental height result:

Boys Predictable Future Height = mid-parental height + 2.4 inc (6 cm)

What determines height?


Adult height is mostly a product of genetics so children have a genetic potential to reach a particular height based on the genes they inherited from their parents. Genetic growth potential is calculated using mid parental height.

But genetics is not predictable. What we cannot say is whether the child will inherit the mother’s or father’s tall or short genes. Also, it is a large possibility that a tall father has unexpressed short genes that the son will inherit and have a medium height despite his father being tall. There are many examples to be illustrated on gene diversity. This also explains why siblings that are raised in similar conditions and come from the same parents still have different heights because the mix of their parent’s genes is different for each of them.


Hormones like growth hormone, thyroid hormone, cortisol, and sex hormones (estrogen and testosterone) are involved in normal development and ultimate height. Hormones also carefully monitor the growth spurt period during puberty which is one of the periods in which development rapidly increases height.


Everybody knows that boys tend to be taller than girls in almost all growth stages, except for puberty when girls get a slight advantage of 2 years as their growth spurt starts earlier. However, when growth spurt reaches boys they are a lot taller than girls, and the advantage switches.

Men also tend to be taller due to the likeliness of having practiced a sport or some form of sustained exercise during childhood, the fact that can beneficially influence height growth.

Genetics and gender account have 70% importance in how tall someone is.

What other factors influence growth?

30% of the factors that determines the height of a child includes:


There cannot be stressed enough the importance of a balanced diet throughout life and even how essential this is during childhood. If on the downside it is known that malnourished children experience delayed development and short stature. There is also no particular evidence to prove that enriching a diet with useful nutrients beyond requested intake can alter the height that someone is genetically destined to reach. 

Overall health:

A healthy child with no serious condition will probably reach a genetically predisposed height.

Several factors can affect ultimate height, their effects measuring up to the extent of the condition, the time in which the child has or had it, and the existence of medical therapy.

Examples include genetic disorders, juvenile diabetes, kidney fibrosis, hormonal disorders, arthritis, and other chronic illnesses.

How to predict your child’s height?

Genes, nutrition, and all kind of other factors influence the height growth of the child and these are very hard to bring together and quantify. Despite that various methods of prediction were established as most parents are very interested in knowing whether their child is developing normally and even what height will he have when he reaches adulthood.

The first thing you need to know is that the height of the newborn is no indicator of the ultimate height. Genes predispose and human disposes of. Studies say that most healthy children usually reach a height that is somewhere between the heights of the parents.

  • One way to predict ultimate height is to double the height of the two-year child as it is said that we reach half of our potential height by age 2. However, this calculation does not account for lifestyle or other influences that can occur during childhood and puberty.
  • Another method to predict height is the one involving growth charts and bone age. Bone age represents the assessment through an x-ray of the bone development that can predict how much more development is likely to continue from that stage on. This method works best in the case of young people that have a few years left till bone growth plates close and height growth stops.
  • One of the most used methods is the one involving parental heights. For predicting a baby girl’s future height you need to add mother and father heights minus 5 then divide this to 2. For predicting a baby boy’s future height you do the same except that you add 5 to the mother and father heights then divide to 2. This calculation can give you an idea within 2-4 inches close to the ultimate height you are looking for.

Best way to predict a child’s adult height

The question is can a child’s adult height be predicted by a height calculator or some kind of height predictor tool? There are many types of calculators available nowadays that can give you an idea of how tall your child will be. Many of them use growth charts and ask for information like parental heights, child’s age, current height, weight, to put the data in a specific range along with the chart and return you with a statistical result of how tall will the child probably be. Others simply use the methods we discussed above to return the possible height.

Whether you are doing the math yourself or testing various height predictors, please remember that all these methods are used to an approximate height and cannot predict with precision what height your child will have as an adult.

Growth rates:

Growth rates vary over a lifetime:

  • Infancy-age 2: starting with an average length of 20 inches there is an initial rapid growth followed by slowing, resulting in about 12 inches added in length and triple the birth weight during this period.
  • After 2: this is a period of steady but sure growth in which most healthy children add about 2½ inches and about 6 pounds a year. There can occur short and small growth spurts from one month to another but no pattern, except for the seasonal one, has been established on that.
  • Puberty time: besides infancy, this is the period in which the most rapid changes occur. As one enters puberty, the growth spurt can go up to 5 inches in a year. For girls, the growth spurt begins at 10 and lasts until 15, with a growth peak at 12. Boys usually enter puberty two years later until age 17 with the growth peak at 14.

Other Calculators