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Height Predictor Calculator

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### Pediatric Endocrinology & The Tanner Mid-Parental Formula Genetics account for approximately $80\%$ of adult height variation. Pediatricians utilize the **Tanner Mid-Parental Method** to.

Reviewed by Dr. Shahzad · DHMS, RMP
Last updated:
Editorial Guidelines

⚙ Input Values

📊 Results

Predicted Adult Height (Ft & In)
5' 9.5"
Predicted Adult Height (Metric)
176.5
cm
95% Mid-Parental Range (± 2 in)
5' 7.4" – 5' 11.6"
95% Mid-Parental Range (± 5 cm)
171.2 – 181.8
cm
✦ Pediatric Endocrinology Genetic Summary
Pediatric Endocrinology Height Prediction (Boy / Average Parents): Predicted Adult Height = 5' 9.5" (176.5 cm). Mid-Parental 95% Target Range: 5' 7.4" – 5' 11.6" (171.2 – 181.8 cm). Tanner Formula Calculation: Mother (5' 4" / 162.6 cm) & Father (5' 10" / 177.8 cm). Genetic Standards: Approximately 80% of human height variance is governed by polygenic inheritance, with the remaining 20% influenced by pediatric nutrition, sleep quality, and physical activity.
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📐 Formula

Conversion factors (to SI base unit or reference unit):
momIn: 64.0
dadIn: 70.0

💡 Practical Example

✅

A mother who is 5'4" (162.6 cm) and a father who is 5'10" (177.8 cm) calculate their daughter's adult height potential as 5'6.0" (167.6 cm) with a target range of 5'3.9" to 5'8.1".

📖 About Height Predictor Calculator

Pediatric Endocrinology & The Tanner Mid-Parental Formula

Genetics account for approximately 80\% of adult height variation. Pediatricians utilize the Tanner Mid-Parental Method to establish a child's genetic target height:

  • Tanner Formula for Boys:

Target Height (in) = Father's Height (in) + Mother's Height (in) + 5.02

Target Height (cm) = Father's (cm) + Mother's (cm) + 13.02

  • Tanner Formula for Girls:

Target Height (in) = Father's Height (in) - 5.0 + Mother's Height (in)2

Target Height (cm) = Father's (cm) - 13.0 + Mother's (cm)2

  • Target Confidence Interval: Human polygenic inheritance yields a natural Gaussian distribution of ± 2.0 to 2.1 inches (± 5.0 to 5.3 cm) around the mid-parental mean.

How to Use This Calculator

Enter your Unit System — select from Imperial (feet & inches / lbs), Metric (cm / kg), Child's Biological Sex — select from Boy (Male), Girl (Female), Mother's Height (Total Inches or cm) (e.g. 64 for 5'4" or 162.6 cm), Father's Height (Total Inches or cm) (e.g. 70 for 5'10" or 177.8 cm), Height Prediction Method — select from Tanner Mid-Parental Formula (Standard Genetic Potential), Age 2 Doubling Rule (2 × Height at Age 2), and Parental Benchmark Profile — select from Custom Parental Heights, Boy / Average Parents (Mom 5'4" / Dad 5'10" → Son 5'11.5"), Girl / Average Parents (Mom 5'4" / Dad 5'10" → Daughter 5'6.0"). Results update instantly — no submit button needed. Use metric or imperial units as labeled. For the most accurate result, measure height and weight in the morning without shoes.

The Formula

Conversion factors (to SI base unit or reference unit):

momIn: 64.0

dadIn: 70.0

Worked Example

A mother who is 5'4" (162.6 cm) and a father who is 5'10" (177.8 cm) calculate their daughter's adult height potential as 5'6.0" (167.6 cm) with a target range of 5'3.9" to 5'8.1".

Understanding Your Result

Health calculations based on standard clinical formulas give a population-reference estimate — individual variation exists. Compare your result to the reference ranges provided using validated sources (WHO, CDC, NIH, or specialty clinical guidelines). A single measurement is a starting point; meaningful health trends emerge from tracking the same metric over time under consistent conditions. For values outside reference ranges, consult a qualified healthcare provider before making changes to diet, exercise, or medication.

💡 Expert Health Guidance & Clinical Context

  • This calculator uses clinically validated formulas and population reference data published by the WHO and NIH. Results are screening estimates, not medical diagnoses.
  • Consult a licensed healthcare provider before making any changes to diet, medication, or exercise based on these results — individual variation is significant.
  • Genetics, chronic conditions, and concurrent medications can dramatically affect what a "normal" result means for a specific individual.
  • Track your results over time: a single data point is less meaningful than a trend measured consistently across multiple weeks or months.
  • The CDC recommends adults receive routine health screenings at least annually. Use these calculations to prepare informed questions for your physician.
  • Body composition, lifestyle factors, and stress levels all interact with the metrics shown here. No single number captures your full health picture.
  • For pediatric or geriatric populations, reference ranges may differ significantly from the adult standards used in general calculators.
  • Always cross-reference results with laboratory tests, clinical examinations, and professional medical evaluation before acting on any finding.

Results are for informational and educational purposes only. Always verify critical decisions with a qualified professional.

❓ Frequently Asked Questions

Why is 5 inches (13 cm) added for boys and subtracted for girls?

Adult men are on average 5 inches (13 cm) taller than adult women due to the biological influence of testosterone and a longer adolescent growth spurt.

Is the 2 × height at age 2 rule accurate?

The 'double height at age two' method is a useful rough estimate for boys (and doubling height at 18 months for girls), but the mid-parental formula is scientifically superior because it accounts for genetic heritage.

What non-genetic factors affect a child's height?

Adequate sleep (growth hormone is secreted during deep slow-wave sleep), balanced protein and micronutrient nutrition (vitamin D, calcium, zinc), and physical activity influence the remaining 20% of growth potential.

When do boys and girls stop growing in height?

Girls typically stop growing around age 14 to 16 (usually 2 years after menarche), while boys continue growing until age 16 to 18 when growth plate epiphyseal fusion occurs.

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