How accurate is the mid-parental method?

It is accurate to within ± 8 cm (about 3 in) for most children. Genetics is the dominant factor but nutrition, illness and timing of puberty can shift the final result.

What is the mid-parental formula?

Boy: ((father + mother) / 2) + 6.5 cm. Girl: ((father + mother) / 2) − 6.5 cm. The 6.5 cm reflects the average sex difference in adult height.

Why does current child height matter?

For school-age children, you can also project adult height by extrapolating their current growth percentile. Combining genetic and growth-based estimates gives a more reliable range.

Can I influence height?

Genetics accounts for about 80%. The remaining 20% is mostly nutrition (especially in the first 5 years), sleep and overall health. Beyond these, no commercially available product reliably increases final adult height.

📏 Højdeprediktor

Estimer et barns voksenhøjde ved hjælp af midforælderformlen plus valgfri nuværende alder ekstrapolation.

Enheder

Child's sex

Fars højde (cm)

Mother's height (cm)

Barnets alder (år, valgfrit)

Child current height (optional)

⚠️ Estimat only. Den endelige voksenhøjde varierer baseret på ernæring, sygdom, tidspunkt for puberteten og vækstrelaterede medicinske tilstande. Tal med en pædiater for individualiseret vurdering.

Om højdeprediktoren

Adult height is roughly 80% genetic. The classic mid-parental method averages the parents' heights and adjusts by 6.5 cm for the child's sex.

Boy: midforælders gennemsnit + 6,5 cm
Girl: mid-parent − 6.5 cm

For school-age children, the calculator also adds a simple growth-extrapolation estimate using approximate WHO/CDC ratios — useful as a sanity check on the genetic figure.

Hvad påvirker nøjagtighed

Tidspunkt for puberteten (tidlig eller sen debut med 1–2 år kan ændre voksenhøjden med 3–5 cm)
Ernæring i de første 5 år og i ungdomsårene
Chronic illness or growth disorders
Stedfar/-mor eller ukendte biologiske forældre — brug biologiske forældrehøjder for nøjagtighed

Ofte stillede spørgsmål

± 8 cm range — why so wide? Even with both parents' heights known, the genetic spread plus environmental factors give roughly a 16 cm prediction interval at 95% confidence.

Can a child be taller than both parents? Yes — common when one parent comes from a tall family with shorter immediate parents. Genetic recombination is unpredictable.

⚠️

Vigtig bemærkning: Forudsigelser er estimater. Konsulter altid en børnelæge for klinisk vækstvurdering — især hvis et barns vækst afviger markant fra familienormer.

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