How tall will I be?
Below the height prediction is some other interesting predictions relating to percentiles, weight lifting ability, and speed.
The following additional analysis is for characteristics of an adult of the predicted height and weight above. Please note that the results are predictions for a statistical average and do not apply to anyone in particular. All predictions are relative to a person of average height and weight unless indicated otherwise by a *. For more information, click on the various section titles.
Height Calculation Methods
Mid Parental Height Calculation
The simplest height calculator 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.
Calculate by Doubling Height at Age Two
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.
Khamis-Roche Height Calculation
The Khamis-Roche Method1 combines the best of both of the above 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 height calculator at the beginning of this article.
Bone Age Height Calculators
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.
Calculate Height From Height Percentile
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.
Height Calculation Methods Summary
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. For further reading, you might check out some of the books below.
How Tall will I be at a Certain Age?
One way to get an estimate of how tall you will be at a certain age is to use growth charts. Note though that growth happens irregularly, and so predictions can be off. The calculated height at various ages in the results section is based off of CDC growth charts. It is just adjusted to the height prediction method selected.