Mid-Parental Height Calculator

Use the mid parental height formula as a parents height predictor to estimate a child's genetic target adult height range.

Enter father's and mother's heights to calculate biological genetic potential. The result includes a target height midpoint and a realistic growth range so the output feels complete at a glance.

Child Sex

Father Height (cm)

Mother Height (cm)

Mid-Parental Height Formula: Fast Genetic Baseline

If your goal is a quick genetic forecast, this is the right page. People searching for a parents height predictor usually want one thing: a simple, evidence-informed target based on mom and dad heights. That is exactly what the mid-parental formula provides.

This tool is a spoke in a larger cluster. For full method comparison, you can cross-check the result in the Ultimate Height Predictor hub.

Tool Explanation

The Mid-Parental Height Calculator estimates target adult height using parental statures and child sex. It does not require age, weight, or X-ray data, making it one of the easiest first-step estimation methods for families.

How It Works (Simple + Scientific)

Final height is strongly influenced by polygenic inheritance. Mid-parental formulas approximate this inherited target and then provide a practical interpretation range because individual growth outcomes still vary.

Clinically, it is often used as a baseline reference, then compared with growth charts and maturity-based methods.

Formula Used

Boys: (Father Height + Mother Height + 13 cm) / 2

Girls: (Father Height + Mother Height - 13 cm) / 2

Interpretation Range: Mid-Parental Target ± 8.5 cm

Practical Examples

Example 1 (Boy)

Father 180 cm, mother 165 cm: (180 + 165 + 13) / 2 = 179 cm target.

Example 2 (Girl)

Father 176 cm, mother 160 cm: (176 + 160 - 13) / 2 = 161.5 cm target.

Interpretation Table

Output Zone	Meaning
Target Center	Genetic midpoint estimate from parental heights.
Lower Bound	Typical variation below midpoint (about -8.5 cm).
Upper Bound	Typical variation above midpoint (about +8.5 cm).

Benefits and Use Cases

Fast baseline without age or radiology inputs
Useful starting point for growth discussions
Helps interpret whether current growth trend is near genetic zone
Easy to combine with bone-age and age-projection methods

Trusted Medical References (E-E-A-T)

Reference links are curated for reader trust and evidence context.

CDC Growth Charts Clinical percentile references for growth monitoring. WHO Child Growth Standards Global standards for healthy growth benchmarks. AAP American Academy of Pediatrics Pediatric clinical guidance and policy resources. NIH MedlinePlus Child Growth Parent-friendly educational content on child growth.

Authority hub: Compare this formula with other methods in Ultimate Height Predictor.

Disclaimer: Educational estimate only. It should not replace pediatric growth evaluation.

Mid-Parental Height Calculator FAQs

Answers to common questions about calculating target height using parental genetics.

How accurate is the Mid-Parental Height Calculator?

The mid-parental height method provides a reliable estimate based on biological genetics. Most children reach an adult height within ±3.3 inches (±8.5 cm) of their calculated target height range.

How do you calculate mid-parental height for boys and girls?

For boys, add 5 inches (13 cm) to the mother's height, add the father's height, and divide by 2. For girls, subtract 5 inches (13 cm) from the father's height, add the mother's height, and divide by 2.

Why does the mid-parental height prediction show a range?

The calculation gives a target range rather than a single exact number because biological factors like puberty timing, nutrition, sleep, and polygenic inheritance naturally cause final adult height to fluctuate.

Can I use mid-parental height if I don't know both parents' heights?

No, the mid-parental formula requires biological data for both parents. If you only know the child's age and current stature, use an Age-Based Height Predictor instead.

How does mid-parental height compare to Khamis-Roche or Bone Age methods?

Mid-parental height relies solely on parental genetic potential. Khamis-Roche adds the child's current weight and stature for higher mid-childhood precision, while Bone Age X-rays evaluate skeletal maturity and provide clinical-grade precision.

When should I consult a pediatrician about my child's target height?

Consult a pediatrician if your child's growth curve significantly diverges from their mid-parental target range, if growth slows unexpectedly for 6 months, or if signs of early or delayed puberty appear.