Height Calculator for Kids

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How to Use this Height Calculator

The calculator is quite easy to use, here is what you need to do:

  1. Select the unit system as either imperial (ft, lb) or metric (cm, kg)
  2. Specify whether the child is over four years old or not
  3. Input the child’s data (age, height and weight) and the parents’ heights
  4. Press the ‘Calculate’ button to get the predicted child’s height

Please note that if the kid is under the age of four, then you won’t need to input the child’s data, only the parents’.

Also, make sure to fill in all the shown data, otherwise no calculation will be made.

What Method the Calculator Utilizes

The calculator above uses the Khamis-Roche method for kids aged 4+ and the mid-parental method for newborns and younger children. This is why different data inputs are required on the calculator depending on the selection for kid’s age (point 2 above).

The formula for Khamis-Roche technique includes the child’s stature, weight and mid-parent stature (average of parents’ heights) along with some coefficients that are based on the kid’s age and gender.

On the other hand, the mid-parental method mainly involves averaging the parents’ heights. The formula also includes either adding or subtracting an extra 5 inches (13 cm) which depends on whether it’s a boy or girl.

The reason for using both of those techniques instead of just one is that Khamis-Roche method can be used for only children aged four years and older.

What’s the Benefit of a Height Calculator

Using this kind of calculator, parents can track their kid’s physical development through estimating their adult height.

So, if the parent sees their child’s projected height is shorter than expected, they can take action early on to fix that including food and lifestyle changes.

Additionally, It can be fun to compare the adult height of your kids (if you have more than one child) and even the children of your relatives or friends.


We hope the above child height calculator was helpful for you.

Before inputting any data in the calculator, remember first to select the preferred unit system (lb,ft or kg,cm) and whether the child is over the age of four or not.

Lastly, we want to mention that we also have a height comparison tool in case you’re interested.