Salud

How Tall Will My Child Be? Adult Height Predictor

Predict your child's adult height from the parents' heights with the Tanner mid-parental formula. Free calculator + height chart by parents and a ±8.5 cm range.

🗓️ Updated June 2026 Reviewed by Martín Rodríguez

Calculator Free · Private

Reviewed by: Martín Rodríguez (editorial policy ) · Last reviewed: Jun 20, 2026

Father's height (cm)*

Mother's height (cm)*

Child's sex*

🧮 Keep calculating

Adolescent Final Height Prediction CalculatorPredict your teen's adult height using the Mid-Parental Height formula (Tanner method). Enter current age, sex, and both parents' heights. Result includes a confidence range — free, instant, no signup.Child BMI Percentile Calculator (CDC, Ages 2-19)Find your child's BMI percentile by age and sex using CDC growth charts. Free pediatric BMI calculator with the CDC weight-status table and 2023 AAP obesity guidelines.How Much Should a Child Weigh? Healthy Weight by Age & SexHow much should your child weigh? Enter age and sex to get the healthy weight range (15th–85th percentile) from official WHO growth standards, plus a full weight-by-age chart for boys and girls.Ideal Weight Calculator — Lorentz & Devine FormulasFind your ideal body weight by height with the Lorentz (1929) and Devine (1974) clinical formulas. Enter height and sex — get both numbers, a height-by-height table, and your healthy BMI range.

Have a website? Embed this calculator for free Free — copy the code and paste it on your website Embed on your site

<iframe src="https://hacecuentas.com/embed/child-height-prediction" width="100%" height="560" style="border:1px solid #e2e8f0;border-radius:12px;max-width:720px" loading="lazy" title="How Tall Will My Child Be? Adult Height Predictor"></iframe>
<p style="font-size:13px;text-align:center;margin:8px 0">Powered by <a href="https://hacecuentas.com" target="_blank" rel="noopener">Hacé Cuentas</a> — <a href="https://hacecuentas.com/child-height-prediction" target="_blank" rel="noopener">How Tall Will My Child Be? Adult Height Predictor</a></p>

Preview →

Paste it on your site. Keep the credit link — thanks for sharing. More widgets →

Want to know how tall your child will be as an adult? The Tanner mid-parental height method estimates a child's adult stature from both parents' heights. It averages the parents' heights and adjusts by ±6.5 cm for sex (so a +13 cm swing between a boy and a girl), giving a genetic target height with a ±8.5 cm range. It's a genetic estimate — nutrition, health, sleep and puberty timing move the final number within that range.

When to use this calculator

You want to estimate how tall your child will be as an adult.
Your pediatrician mentioned 'target height' (mid-parental height) and you want to calculate it.
You want to compare the prediction to your child's current growth-chart percentile.
You're checking if your child is growing toward his or her genetic potential.
General family curiosity about your child's future height.

Predicted Adult Height by Parent Combination (Tanner Mid-Parental Method)

Father	Mother	Boy target	Boy range	Girl target	Girl range
165 cm	155 cm	166.5 cm	158–175 cm	153.5 cm	145–162 cm
170 cm	160 cm	171.5 cm	163–180 cm	158.5 cm	150–167 cm
175 cm	163 cm	175.5 cm	167–184 cm	162.5 cm	154–171 cm
178 cm	165 cm	178.0 cm	169.5–186.5 cm	165.0 cm	156.5–173.5 cm
180 cm	168 cm	180.5 cm	172–189 cm	167.5 cm	159–176 cm
185 cm	170 cm	184.0 cm	175.5–192.5 cm	171.0 cm	162.5–179.5 cm
190 cm	175 cm	189.0 cm	180.5–197.5 cm	176.0 cm	167.5–184.5 cm

Fuente: Tanner JM, Arch Dis Child 1970 (fórmula mid-parental). Target = (altura padre + altura madre ± 13) ÷ 2. Rango = target ± 8.5 cm (≈ 95% de los casos). Para convertir a pies/pulgadas: cm ÷ 2.54.

How it works

How to Predict Your Child's Adult Height (Tanner Formula)

The mid-parental height (Tanner) method is the formula pediatricians use most. You average the parents' heights and shift by 6.5 cm for the child's sex:

For a boy

Target height = (father's height + mother's height + 13) ÷ 2

For a girl

Target height = (father's height + mother's height − 13) ÷ 2

The ±8.5 cm band (≈ ±2 standard deviations) covers about 95% of cases.

Predicted Child Height by Parents' Height

Estimated adult target height for common parent combinations (cm). Boy = column shown; for a girl, subtract 13 cm then ÷ 2 — or just subtract 6.5 cm from the boy value below.

Father	Mother	Boy (target)	Girl (target)
165 cm	155 cm	166.5 cm	153.5 cm
170 cm	160 cm	171.5 cm	158.5 cm
175 cm	163 cm	175.5 cm	162.5 cm
178 cm	165 cm	178.0 cm	165.0 cm
180 cm	168 cm	180.5 cm	167.5 cm
185 cm	170 cm	184.0 cm	171.0 cm
190 cm	175 cm	189.0 cm	176.0 cm

Each value carries the ±8.5 cm range. To convert to feet/inches, divide cm by 2.54 (e.g. 175.5 cm ≈ 5'9").

How Accurate Is It?

Target height is a genetic estimate. Height is 60–80% heritable, so most kids land inside the range. Final adult height also depends on:

Nutrition (chronic malnutrition lowers final height)

Overall health (chronic illness, hormonal disorders)

Puberty timing (early puberty closes growth plates sooner → shorter final height)

Sleep and physical activity (growth hormone is released during deep sleep)

Epigenetic and secular-trend factors

Average Adult Heights

Sex	US average	World average
Males	175 cm (5'9")	~171 cm
Females	163 cm (5'4")	~159 cm

When to Worry About Height

See a pediatric endocrinologist if your child is below the 3rd percentile on standard growth charts, is growing less than 4 cm per year after age 4, or falls well below the predicted target range as they grow.

Related Calculators

Adolescent Final Height Prediction — uses current height + bone-age stage.

Child BMI Percentile — pediatric BMI by age and sex.

Ideal Weight for Children — healthy weight by age and sex.

Example: Father 175 cm, Mother 163 cm, Boy

Father: 175 cm. Mother: 163 cm.

Formula for boys: (175 + 163 + 13) ÷ 2 = 175.5 cm.

Range: 175.5 ± 8.5 = 167 to 184 cm.

Your son's predicted adult height is 175.5 cm (range: 167 to 184 cm).

Disclaimer: Los resultados son orientativos y no reemplazan la consulta médica profesional. Antes de tomar decisiones con impacto, consultá con un médico, nutricionista o profesional de la salud matriculado.

Frequently asked questions

How can I predict how tall my child will be?

Use the Tanner mid-parental formula. For a boy: (father + mother + 13) ÷ 2. For a girl: (father + mother − 13) ÷ 2, with heights in cm. The result is the genetic target height, with a ±8.5 cm range. Example: father 178 cm + mother 165 cm, girl = (178 + 165 − 13) ÷ 2 = 165 cm.

How accurate is the Tanner height prediction formula?

It has a margin of ±8.5 cm (covering ~95% of cases). It's a genetic estimate; actual final height also depends on nutrition, health, puberty timing and environment.

Do children usually end up the same height as their parents?

Height is 60–80% heritable, so most children fall within the target-height range. Exceptions happen because of environmental, hormonal and epigenetic factors.

Why does the formula add or subtract 13 cm?

On average, adult men are about 13 cm taller than women. The Tanner formula bakes that gap in: it shifts the mid-parental average +6.5 cm for boys and −6.5 cm for girls, a 13 cm total spread between the two.

Can nutrition affect a child's final height?

Yes. Good nutrition helps a child reach maximum genetic potential. Chronic malnutrition during childhood can significantly reduce final adult height.

Does early puberty affect final height?

Yes. Early puberty can make a child tall early, but it closes the growth plates sooner, often resulting in a shorter final height than predicted.

When do children stop growing?

Girls typically stop between ages 14–16 (about 2 years after the first period). Boys usually stop between 16–18, though some grow slowly until around 21.

How do I convert the predicted height to feet and inches?

Divide centimeters by 2.54 to get inches, then split into feet and inches. Example: 175.5 cm ÷ 2.54 ≈ 69.1 in ≈ 5 ft 9 in.

Can I use this calculator if my child is adopted?

If you don't know the biological parents' heights, this formula doesn't apply. Growth-chart tracking and pediatric guidance are the best alternatives.

Does sport or exercise make children grow taller?

Exercise doesn't directly increase final height. But physical activity plus adequate sleep (when growth hormone is released) helps children reach their genetic potential.

What if my child is growing slower than expected?

Track growth velocity. If your child grows less than 4 cm per year after age 4, or falls below the 3rd percentile, consult a pediatric endocrinologist.

Sources & references

Methodology & trust

Editorial

Calculadora de salud revisada por el equipo editorial de Hacé Cuentas, contrastada con Tanner JM — Standards for growth velocity (Arch Dis Child, 1970), según nuestra política editorial y metodología.

Updates

Última revisión: June 20, 2026. Los parámetros se verifican periódicamente con las fuentes citadas.

Privacy

Calculations run 100% in your browser. We do not store or transmit your data.

Limitations

Indicative results. For critical decisions, consult a professional.

📌 How to cite this calculator

Rodríguez, M. (2026). How Tall Will My Child Be? Adult Height Predictor. Hacé Cuentas. https://hacecuentas.com/child-height-prediction

Contenido bajo licencia CC-BY 4.0 — reutilizable citando la fuente con enlace a Hacé Cuentas.

✉️ Reportar un error en esta calculadora