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Open Tool →How Tall Will I Be? Height Predictor Calculator
Estimate likely adult height using three widely used clinical frameworks: Mid-Parental, Khamis-Roche, and Bone Age. Compare outputs and interpret with confidence ranges.
Mid-Parental method estimates genetic target height from parent heights. It is fast and commonly used as a baseline growth target.
Khamis-Roche is a non-radiographic method that combines age, current height, weight, and parental heights. It generally performs better than parent-only methods.
Bone Age method uses skeletal maturity (bone age) and current height. This can be useful when growth tempo differs from chronological age.
Predicted Adult Height
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Imperial
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Likely range
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⚠️ These are educational estimates, not a diagnosis. For growth concerns, consult a pediatrician or pediatric endocrinologist.
How Tall Will I Be? Understanding Height Prediction
The "How tall will I be" question is commonly answered using height prediction formulas such as Mid-Parental, Khamis-Roche, and Bone Age methods. These methods estimate adult height based on genetics, growth data, and skeletal maturity.
Height Predictor Calculator: Mid-Parental, Khamis-Roche, and Bone Age
Predicting adult height is never exact, but structured clinical methods can provide useful estimate ranges for family growth planning and pediatric follow-up discussions. This calculator gives you three approaches in one page so you can compare results side by side.
Height Prediction Methods Comparison
The table below gives a quick comparison of inputs and practical accuracy level for each method, so families can choose the best approach based on available data.
| Method | Inputs Required | Accuracy |
|---|---|---|
| Mid-Parental | Father height, Mother height | Medium |
| Khamis-Roche | Age, Height, Weight, Parents height | High |
| Bone Age | Bone age, Current height | Very High |
Accuracy level assumes quality measurements and correct input context. Clinical interpretation with growth charts remains important.
1) Mid-Parental Method (Genetic Target)
This method estimates target adult height from parental heights and the child sex. It is widely used as a baseline in pediatric growth assessments.
- Boys: (father + mother + 13 cm) ÷ 2
- Girls: (father + mother - 13 cm) ÷ 2
Typical natural variation around this target is often considered approximately ±8.5 cm.
2) Khamis-Roche Method (No X-ray Required)
Khamis-Roche uses a broader data set than Mid-Parental alone: child age, current height, current weight, and parental heights. It is a popular non-radiographic model for children and teens and often gives tighter estimates than parent-only formulas.
In this tool, age-specific coefficients are used to model the method and deliver a practical estimate range. For clinical decisions, pediatric growth chart context should always be considered.
3) Bone Age Method (Skeletal Maturity)
Bone age methods estimate adult height from current height and maturity progression. If bone age is delayed or advanced compared to chronological age, this method can capture growth tempo effects better than age-only models.
This page uses a practical maturity-ratio model with selectable tempo (Delayed, Medium, Advanced) so families can compare scenarios quickly.
How to Interpret Results Correctly
- Use all three methods and compare overlap rather than trusting a single number.
- If methods disagree widely, clinical growth tracking is more important than one-time prediction.
- Rapid percentile changes, very short stature, or delayed puberty signs should be discussed with a doctor.
Important: This calculator is for informational use and does not replace growth evaluation by a qualified healthcare professional.