Child Height Predictor
Estimate a child’s adult height range from sex, age, current height, and both parents’ heights using mid-parental height and the current growth trend.
Child Height Predictor
Enter your child’s sex, current age and height, plus both parents’ heights to estimate an adult height range using mid-parental height and the child’s current growth trend.
Enter the growth record
This calculator is for at-home growth tracking only. If growth suddenly slows, height or weight changes worry you, or puberty timing seems unusual, prioritize a pediatric consultation.
Please check the inputs.
Reference range 166.7 cm ~ 182.7 cm
The mid-parental target is 175.0 cm, and the current height is slightly above the same-age reference.
The current height is close to the same-age reference range.
| Child | Boy · 8 yr 0 mo · 128.0 cm |
|---|---|
| Parents’ heights | Father 175.0 cm · Mother 162.0 cm |
| Formula used | (father+mother+13)÷2 |
| How to read the range | Read with a wider range around puberty timing differences |
What is the Child Height Predictor?
The Child Height Predictor estimates a child’s possible adult height from the child’s current age and height plus both parents’ heights. It combines a mid-parental height target with the child’s current growth trend, so the result is easier to interpret than a single inherited-height number.
The result is not a diagnosis. Growth depends on puberty timing, sleep, nutrition, activity, health conditions, and family history, so use the estimate as a reference range for tracking growth records and preparing questions before a clinical visit.
When to use it
Use this tool after a checkup or school measurement when you want a quick sense of how a child’s height is tracking. Comparing the mid-parental target with the current height can help you organize the record before deciding whether more detailed growth-chart review is needed.
- You want to see whether the current height is far from a same-age reference trend.
- You want a quick mid-parental height target based on both parents’ heights.
- You are keeping a growth log and want to summarize current height and remaining growth potential.
- You want to organize current height, parent heights, and an estimated range before a pediatric visit.
Key features
The input is intentionally compact: sex, age, current height, and both parents’ heights. The top result card shows the estimated adult height and range first, followed by compact cards for the mid-parental target, current trend estimate, remaining growth, and current height comparison.
- Mid-parental target – boys use (father+mother+13)÷2, girls use (father+mother-13)÷2.
- Current growth trend adjustment – the estimate is adjusted by the gap between current height and a same-age reference height.
- Range-first interpretation – the output shows a reference range, not just one fixed number.
- Compact mobile layout – inputs, result cards, and the summary table are arranged for fast scanning on phones.
How to use
Select the child’s sex, enter age in years and months, then enter the child’s current height and both parents’ heights in centimeters. The result updates automatically. Use the example buttons if you want to preview the input format and result layout first.
- Choose boy or girl.
- Enter the child’s age, extra months, and current height.
- Enter father and mother heights in centimeters.
- Review the estimated adult height, reference range, current height gap, and calculation summary.
Calculation basis and interpretation
The parent-height target uses the common mid-parental height method. For boys, add 13cm to the sum of both parents’ heights and divide by 2. For girls, subtract 13cm from the sum and divide by 2. This gives a central target, while the actual adult height should be read as a range.
The current trend adjustment compares the child’s current height with a same-age reference height. Younger children can have more variable growth velocity, and puberty timing can shift the outlook during late elementary and middle-school ages, so the displayed range is intentionally broad.
If you need height unit conversion, use the Height Calculator. If you are organizing early-childhood dates, the Baby Month Calculator may also help.
Frequently asked questions
How accurate is this height prediction?
It is a simplified estimate that combines parent heights and the child’s current growth trend. Actual adult height can change with puberty timing, growth plates, nutrition, sleep, and health conditions, so treat the result as a reference range only.
How is the parent-height formula calculated?
For boys, it uses (father height + mother height + 13) ÷ 2. For girls, it uses (father height + mother height – 13) ÷ 2. This is a central mid-parental target, not a guaranteed adult height.
Can I use it without the current child height?
This version needs the current height because it adjusts the estimate using the child’s current growth trend. Without it, you can only use the mid-parental target as a rough reference.
Does early or late puberty affect the result?
Yes. Puberty timing can change the amount of remaining growth even when two children have the same age and height. Around late elementary and middle-school ages, read the range more broadly.
When should I talk to a doctor?
Consider a pediatric consultation if growth speed suddenly slows, height is persistently far below or above peers, or puberty signs seem unusually early or late. A clinician can review growth charts and growth-plate status.
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