Note : Estimated adult height based on the selected method. Mid-parental = target genetic range; Khamis–Roche = prediction from current growth inputs. Not a guarantee.

Use this Child Height Predictor to estimate a child’s likely adult height using either the Khamis–Roche method or a mid-parental height calculation. It is useful for parents and caregivers who want a practical, educational estimate of future height based on parent stature and current child measurements.

Reviewed by: AjaxCalculators Editorial Team
Last updated: April 22, 2026
Method source: Khamis–Roche adult stature prediction and standard mid-parental target-height calculation
Editorial standards: AjaxCalculators Editorial Policy

What This Child Height Predictor Calculates

This calculator estimates:

• Predicted adult height
• Method-based estimate
• Quick summary of the result

It supports two different approaches:

• Method 1: Khamis–Roche
• Method 2: Mid-parental height

How the Child Height Predictor Works

1) Khamis–Roche Method

The Khamis–Roche method is a published approach for predicting adult stature without using skeletal age. It uses a child’s:

• current age
• current height
• current weight
• mid-parent stature
• sex

This makes it more specific than a parent-height-only estimate because it incorporates the child’s current growth status as part of the prediction.

2) Mid-Parental Height Method

The mid-parental height method is a standard pediatric target-height estimate based on the parents’ heights.

For boys:
(Father’s height + Mother’s height + 13 cm) ÷ 2

For girls:
(Father’s height + Mother’s height − 13 cm) ÷ 2

In inches, the same formula is often written using 5 inches instead of 13 cm.

This method is best understood as a genetic target height estimate, not a precise final adult-height prediction.

Assumptions and Important Notes

• This calculator gives an estimate, not a guaranteed adult height.
• Khamis–Roche and mid-parental height are different kinds of estimates and should not be treated as identical methods.
• Parent height helps estimate genetic height potential, but real adult height can still vary because of puberty timing, nutrition, chronic illness, sleep, and overall health.
• A growth prediction should never replace clinical assessment when there are concerns about short stature, rapid growth change, delayed puberty, or endocrine disease.
• Growth tools are most useful when interpreted together with the child’s growth pattern over time.

Worked Example

Suppose the following values are entered:

• Mother’s height: 160 cm
• Father’s height: 175 cm
• Child’s sex: Boy

Example A: Mid-Parental Height

Step 1: Apply the boy formula
(175 + 160 + 13) ÷ 2

Step 2: Calculate
348 ÷ 2 = 174 cm

So the mid-parental target height estimate is 174 cm.

Example B: Khamis–Roche

If the same child also has current age, height, and weight entered, the Khamis–Roche method uses those extra growth variables together with parent stature to produce a more specific adult-height prediction.

That is why the two methods may give similar but not identical results.

How to Use This Child Height Predictor

1. Select the unit system.
2. Choose the prediction method: Khamis–Roche or mid-parental height.
3. Enter the mother’s and father’s heights.
4. Select the child’s sex.
5. If using Khamis–Roche, enter the child’s age, current height, and current weight.
6. Review the predicted adult height and summary.

How to Interpret the Result

The result is a future height estimate, not a promise.

Mid-parental height is best interpreted as a target genetic range based on parent stature.

Khamis–Roche is a more detailed estimate because it also uses the child’s current growth measurements.

If the child’s actual growth pattern over time looks very different from the expected trajectory, that matters more clinically than one single predicted number.

Practical Uses of a Child Height Predictor

• estimate adult height from current child growth data
• compare a Khamis–Roche estimate with a simpler parent-height target
• understand how parent height influences likely adult height
• use as a conversation starter before discussing growth concerns with a pediatric clinician
• track whether current growth appears broadly consistent with family stature

References

1. Khamis HJ, Roche AF. Predicting adult stature without using skeletal age
2. American Academy of Family Physicians: Midparental height formulas and growth evaluation
3. CDC: Growth charts are not intended to be used as a sole diagnostic instrument
4. CDC: Growth charts overview and age-based use

Related Calculators

• Child Height Percentile Calculator
• Teen BMI Calculator
• Calorie Calculator

Note: This calculator is for educational use only. If you are concerned about unusually short stature, rapid crossing of growth percentiles, delayed puberty, or underlying medical causes of poor growth, discuss the child’s measurements with a pediatric clinician.