Child Height Predictor

Estimate a child's adult height range from parental heights. Enter your own values below to see mid-parental adult height estimate and check the method behind it.

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Your inputs

Change the example values to match your situation.

Your result

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Fill in your inputs and select Calculate.
Your result and breakdown will appear here.

How this calculator works

Mid-parental height = (father’s height + mother’s height ± 13 cm) ÷ 2; add for male, subtract for female.

Before you use the result

  • Genetic target estimate, not a guaranteed prediction. Growth pattern, health and puberty timing can change adult height.

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What is Child Height Predictor?

Child Height Predictor helps you estimate a child's adult height range from parental heights.

The main result is mid-parental adult height estimate, with a breakdown of approximate target range. The formula, example and assumptions below explain how to interpret it.

How to use Child Height Predictor

Use the example to get familiar with the form, then enter your own figures. Any rates in the example are illustrative. Check the field labels and units before calculating.

  1. Gather father’s height (cm), mother’s height (cm) and child’s sex for the estimate. Use values from the same situation or reporting period.
  2. Replace the example father’s height with your own value, then complete the other fields. Check the displayed units and each selected option.
  3. Select Calculate and read mid-parental adult height estimate with its result breakdown. Change one input and calculate again to compare a second scenario. Reset restores the original example.
  • Enter father’s height in cm, at least 100 and at most 230. Decimals are accepted.
  • Enter mother’s height in cm, at least 100 and at most 230. Decimals are accepted.
  • Choose child’s sex for the estimate from Male and Female.

Child Height Predictor: a worked example

With the inputs below, the result is 175 cm (mid-parental adult height estimate). Follow the example, then replace these illustrative values with your own.

Example inputs and output
Input or outputExample value
Father’s height (cm)175 cm
Mother’s height (cm)162 cm
Child’s sex for the estimateMale
Mid-parental adult height estimate175 cm
Approximate target range166.5–183.5 cm

Understanding the Child Height result

Read mid-parental adult height estimate alongside approximate target range. These describe different parts of the same calculation.

Displayed results use a readable number of decimal places. When checking a result by hand, keep extra precision until the last step. To compare scenarios, change one input at a time and keep the others fixed.

  • Example Approximate target range: 166.5–183.5 cm

Child Height Predictor: assumptions and common mistakes

A useful estimate starts with the right inputs. Check the following assumptions and limits before applying the result to your situation.

  • Genetic target estimate, not a guaranteed prediction. Growth pattern, health and puberty timing can change adult height.
  • Health estimates are context-dependent. Age, pregnancy, illness, medication and individual measurements can affect interpretation; these tools do not diagnose a condition.

For wider guidance, visit World Health Organization. The formula and scope of this specific tool are stated on this page.

Child Height Predictor FAQs

What does Child Height Predictor calculate?

Child Height Predictor helps you estimate a child's adult height range from parental heights. Its main output is mid-parental adult height estimate in cm.

What inputs do I need for Child Height Predictor?

You need father’s height (cm), mother’s height (cm) and child’s sex for the estimate. Use the field labels and units to match your figures to the formula.

Which formula does Child Height Predictor use?

Mid-parental height = (father’s height + mother’s height ± 13 cm) ÷ 2; add for male, subtract for female.

What is a worked example for Child Height Predictor?

Example inputs: Father’s height: 175 cm; Mother’s height: 162 cm; Child’s sex for the estimate: Male. The result is 175 cm (mid-parental adult height estimate).

How should I enter father’s height?

Enter father’s height in cm, at least 100 and at most 230. Decimals are accepted.

How do I choose child’s sex for the estimate?

Choose child’s sex for the estimate from Male and Female. The example uses Male; replace it if your circumstances differ.

How should I read mid-parental adult height estimate?

Read mid-parental adult height estimate alongside approximate target range. These describe different parts of the same calculation.

Why might my Child Height Predictor result differ from my records?

Genetic target estimate, not a guaranteed prediction. Growth pattern, health and puberty timing can change adult height. Differences in entered values, units or rounding can also change the comparison.

Can I compare two scenarios in Child Height Predictor?

Yes. Note your first mid-parental adult height estimate, change father’s height or another input, and select Calculate again. Editing a field clears the old result so it is not mistaken for a new calculation.

Is Child Height Predictor free, and where are my inputs calculated?

This calculator is free to use without signing in. Its formula runs in your browser; calculator inputs are not sent to a calculation API. The inputs reset to the example values when you reset the form or start a fresh page.