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Adult height predictor

Predict a child's adult height from the parents' heights.

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Enter Child's sex, Father's height (cm), Mother's height (cm) and the Adult height predictor works out Predicted adult height straight away. For instance, with Child's sex = Male, Father's height (cm) = 178 and Mother's height (cm) = 165 it returns Predicted adult height = 178 cm.

How to use it

  1. Enter your values: Child's sex, Father's height (cm), Mother's height (cm).
  2. Read the result instantly: Predicted adult height.

Frequently asked questions

What does the Adult height predictor actually compute?

It takes Child's sex, Father's height (cm) and Mother's height (cm) and derives Predicted adult height from them. The calculation is live as you type, so the result updates on every change.

What information do I need to provide?

3 values: Child's sex, Father's height (cm) and Mother's height (cm). Nothing else is required — no account, no file upload.

Can you show a worked example?

With Child's sex = Male, Father's height (cm) = 178 and Mother's height (cm) = 165, the calculator returns Predicted adult height = 178 cm. Those figures come from running this exact tool, so you can reproduce them by entering the same values.

What happens if I enter larger values?

It moves a lot. Using Child's sex = Female, Father's height (cm) = 196 and Mother's height (cm) = 182 instead, Predicted adult height goes from 178 cm to 183 cm — which is why it is worth testing a few scenarios rather than trusting a single figure.

Which “Child's sex” option should I choose?

You can pick between « Male » and « Female ». Each one changes what the calculator works out, so switch and compare — the default is « Male ».

What does it give for smaller values?

Scaled down to Child's sex = Male, Father's height (cm) = 160 and Mother's height (cm) = 149, Predicted adult height comes out at 161 cm. The relationship is worth checking at both ends before you rely on a single result.

When would I actually use this?

Getting a reference point before a check-up, setting a realistic target, and understanding why two people of the same weight can be in very different shape — and, the same act from the other side, putting a day's caffeine, salt, sugar or alcohol beside the ceiling a health body publishes for it.

What is the most common mistake?

Reading BMI as a measure of health. It cannot tell muscle from fat, which is why athletes routinely score as overweight and why it says little about an individual.

What is the difference between the Adult height predictor and the Waist-to-height ratio calculator?

This one returns Predicted adult height; the Waist-to-height ratio calculator returns Waist-to-height ratio and Health category. That is the whole difference — open the one whose figure you need.

Is there a tool for the next step?

Height Percentile Calculator is the closest one after this: Where your height sits against the US adult reference, with the z-score and standard-deviation band.

Further reading

All guides →
ExplainerHow Tall Will a Child Be? The Arithmetic Is Easy; the Error Bar Is the StoryAverage the parents' heights, shift by a sex constant, and you have a target height. The honest part is what comes next: the published prediction interval is about ±4 inches, wide enough to cover most of the adult population. Here is the formula, the interval, why bone age does better, and why children keep out-growing the target.ExplainerWhere a Percentile Comes From: Which Population, Measured WhenA percentile is a rank against a reference population, so the first question is never the arithmetic — it is which population, measured when. The same 5'11" man is the 38th percentile in one national dataset and the 86th in another, and the 91st against a reference of people born a century ago. Here is why, and what a z-score adds.ExplainerGrowth Percentiles: What a Child's Centile Really MeansA centile ranks a child against a reference population — it is not a grade, and one reading says almost nothing. Here is the LMS arithmetic behind the number, and why the same boy is on the 90th centile on one chart and the 85th on another.ExplainerBaby Growth, and What Crossing Centiles Actually MeansThe WHO infant standard is prescriptive: it was built from healthy breastfed babies and describes how infants should grow. National references describe how they did grow. In the first year the two disagree by enough to move the same baby forty percentile points, with no change in the baby. Here is the size of the gap, and what the published thresholds for concern actually say.ExplainerHow Blood Type Is Inherited: The Full Parent-to-Child TableEach parent passes on one ABO allele — A, B or O — and Rh follows a separate gene. Here is every parent combination, which child types it can and cannot produce, and why this is not a paternity test.ExplainerWhat Is a Healthy Waist-to-Height Ratio?Keeping your waist under half your height is a simple health marker. Learn what waist-to-height ratio means, how to measure, and why under 0.5 is the goal.