Free adult height estimate

Child Height Predictor - Estimate Your Child's Adult Height

Estimate how tall your child may be as an adult using parental height, age, sex, current height and weight. Results can be viewed in cm or ft/in.

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📏 Height Prediction for Children

What Is Child Height Prediction - and Why Can It Be Helpful?

Many parents wonder what their child's future adult height might be and whether current growth fits the expected pattern.

“How tall is my child likely to be as an adult?”
Important to know Height prediction is a statistical estimate only. It does not replace proper growth monitoring, pediatric evaluation, or professional medical advice.

How does height prediction work?

Genetic target height (Mid-Parental Height)

This method uses the parents' heights to estimate a likely adult height range that the child may grow into.

Weighted height prediction (Khamis-Roche)

When updated age, height, and weight measurements are available, this model also considers current growth status and may offer a more refined estimate in certain age ranges.

What is important to remember?

  • Height prediction is not a diagnosis. It is only one part of understanding a child's growth.
  • One single result does not automatically mean that something is wrong.
  • The most meaningful insight usually comes from the growth trend over time, not from one isolated measurement.
  • Factors such as nutrition, sleep, physical activity, puberty timing, and overall health can all influence final height.
  • If a result seems unusual or concerning, professional guidance is always the best next step.
Tip: If you have recent measurements from the last few months, entering the most up-to-date values may improve the quality of the estimate.
How tall will my child be? The most useful answer is usually a range, not a single guaranteed number. KidGil compares a genetics-based target height with available growth measurements and keeps the result easy to read in metric or US units.

What methods are used?

  • Mid-Parental Height estimates a genetic target from the biological parents' heights.
  • Khamis-Roche can use age, sex, current height, current weight and parental height, without a bone-age X-ray.
  • Accuracy depends on context, including age, measurement quality, puberty timing and individual growth pattern.
Reference: Khamis HJ, Roche AF. Predicting Adult Stature Without Using Skeletal Age: The Khamis-Roche Method. Pediatrics. 1994;94(4):504-507.
📏

How Tall Will My Child Be?

A statistical estimate based on parental genetics. For informational purposes — not a medical tool.

Units
Choose metric or US units for entering measurements and reading the result.
👶 Child Info
Years
Months
Tip: Use "Date of Birth" for a more precise age calculation.
🧬 Parental Heights

Both parents required for the genetic prediction.

If parental heights are missing, a clear error message will appear instead of a result.

How Is a Child's Adult Height Predicted?

Adult height is strongly influenced by genetics, while growth patterns, nutrition, sleep, overall health and the timing of puberty can also affect a child's final height. KidGil presents the result as an estimate and a likely range, not as a guarantee.

Mid-Parental Height

This genetics-based method estimates a target adult height from the biological parents' heights.

Boys: (mother + father + 13 cm) / 2
Girls: (mother + father - 13 cm) / 2

Khamis-Roche Method

When age, sex, current height, current weight and parental height are available, this method can provide a refined estimate without requiring a bone-age X-ray.

How Accurate Is a Child Height Predictor?

A height predictor is best understood as a statistical range. Accuracy can vary by age, measurement quality, puberty timing, individual growth pattern and how closely the child matches the population used to build the model.

  • Use recent height and weight measurements whenever possible.
  • Compare the prediction with the child's growth trend over time.
  • Ask a pediatric clinician for guidance if growth slows, drops across percentiles or seems far outside the expected range.

Related Growth Tools

For a fuller picture, compare the predicted adult height with your child's current growth percentile and other growth indicators.

Height Percentile Calculator BMI Calculator for Kids KidGil Growth Tools

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Frequently Asked Questions About Height Prediction Models in Children

Here you’ll find clear, practical answers to some of the most common questions parents ask about predicting a child’s future height.

Is height prediction accurate?
Height prediction is based on research-based models, but it provides a probability-based range rather than one exact number.

This is why the result should be viewed as an estimate, and ideally interpreted alongside the child’s growth pattern over time.

Do I need to enter my child’s height and weight?
Not always.

For genetic target height (Mid-Parental Height), entering the parents’ heights is usually enough. Height and weight data are mainly needed when using a weighted prediction model such as Khamis-Roche.

Do birth measurements affect final height prediction?
Usually not in a major way.

Birth data are more important for growth monitoring—for example, when tracking growth curves and early growth patterns— but they are not usually the main factor in predicting final adult height in common genetic models.

When should I seek professional advice?
It may be a good idea to seek professional advice if any of the following apply:
  • There is a persistent gap between the child’s actual height and the expected range over time.
  • There is a drop or slowdown in growth velocity.
  • There are concerns related to nutrition or overall health, such as poor appetite, unusual fatigue, or possible absorption issues.
How tall will my child be based on parents' height?
The mid-parental height method estimates a genetic target from the mother and father heights. It is useful as a starting point, but it should be read as a likely range rather than a promise.
Can a child grow taller than both parents?
Yes. A child can grow taller than both parents because height is influenced by many genes, family background, health, nutrition and puberty timing.
Which parent determines a child's height?
Both parents contribute. Height is polygenic, which means many genes from both sides of the family are involved.
How accurate is the Khamis-Roche method?
Khamis-Roche is a research-based estimate that uses current measurements and parental height, but accuracy still varies by age, puberty timing, measurement quality and population differences.
Does puberty affect predicted adult height?
Yes. Early or late puberty can change the timing of growth spurts and may affect how a prediction should be interpreted.
Why did my child's predicted height change?
Predictions can change when new height, weight or age data are entered. A trend across several measurements is usually more meaningful than one isolated result.
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