Height Calculator

Predict a child's adult height from both parents' heights (mid-parental method)

Predicting a child's likely adult height from both parents' heights, using the mid-parental method, gives a statistical estimate range rather than a precise prediction — genetics contribute substantially to adult height, but a wide range of other factors mean any single-number prediction should be understood as a rough central estimate, not a guarantee.

Why mid-parental height is an estimate, not a determination

The mid-parental method averages both parents' heights (with a standard adjustment for the child's sex, since there's a typical height difference between adult males and females) to produce an estimated target height, generally presented with a plus-or-minus range rather than a single exact figure — this range reflects genuine, expected variation, since height is influenced by many genes plus environmental and nutritional factors during childhood and adolescence, not solely by a simple average of parental height. A child's actual adult height can reasonably fall anywhere within that estimated range, and falling outside the typical range doesn't necessarily indicate anything is wrong — it reflects genuine biological variability around a statistical central tendency, not a precise, deterministic outcome.

A worked example

Two children from parents with identical mid-parental height estimates can grow to meaningfully different actual adult heights, both still within the range of normal biological variation — the mid-parental calculation gives a reasonable central estimate and expected range, not a precise individual prediction, since non-genetic and other genetic factors beyond simple parental averaging also play a real role.

How this connects to your other health calculations

This is a growth-prediction estimate specifically, distinct from current health status measures like BMI or Body Surface Area — for any concern about a child's actual growth trajectory relative to expected patterns, a pediatrician's growth-chart tracking over time is the appropriate clinical tool, not a one-time mid-parental estimate.

Common mistakes

Treating the mid-parental height estimate as a precise, guaranteed prediction rather than a statistical range with genuine expected variation is a common misunderstanding — a child's actual adult height falling meaningfully above or below the estimated central figure, while still within the broader normal range, isn't inherently unusual or concerning on its own.