Height predictor

Calculate the mid-parental adult-height estimate and its broad reference range from both biological parents.

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Biological father height (cm)

Biological mother height (cm)

More inputs and assumptions

Mid-parental equation

Answer

…

Calculate the mid-parental adult-height estimate and its broad reference range from both biological parents.

More results

Precision and calculation record

Decimal places in numeric results and text downloads

Rounding changes displayed numbers, not the calculation. Text, fractions, matrices and CSV schedules keep their own formatting. Automatic keeps up to 12 significant digits, with money shown to cents where applicable.

Saved scenario

Save the current answer, then change an input to compare. This clears when you leave.

Formula and assumptions

Uses the AAP centimeter formula: add or subtract 13 cm before dividing by two, then show a range of plus or minus 10.2 cm. This is a family-height estimate, not a forecast of an individual child or a growth assessment. It does not use bone age, puberty, illness or the child's measurements.

Automatic precision shows numbers to 12 significant digits. Thousands separators such as 1,000 are accepted; use a dot for decimals.

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Updated 2026-09-29

Using Height predictor

Calculate the mid-parental adult-height estimate and its broad reference range from both biological parents.

Next: Child height percentile calculator

Next: Length converter

A worked example

For biological father height (cm) = 180, biological mother height (cm) = 165, mid-parental equation = Boy, mid-parental height estimate (cm) = 179.

Before you use the result

Example results for biological father height (cm)

These examples use Biological mother height (cm): 165; Mid-parental equation: Boy. They are reference calculations, not recommended settings.

Biological father height (cm)	Mid-parental height estimate (cm)
90	134
180	179

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ToolOctopus. “Height predictor.” Updated 2026-09-29. https://tooloctopus.com/height-predictor.

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