One family midpoint
The central number combines both parent heights and the clinical female or male adjustment. It is not a promised final height.
Parent heights
Enter two measurements
Family adult height estimate
165.0 cm5 ft 5 in
Family target range154.8 cm–175.2 cm
The AAP describes a target range of ±4 in (±10.2 cm) around the mid-parental estimate. This is a broad family-height range, not the Khamis–Roche prediction interval.
Adult height estimate
How tall will I be?
Start with both biological parents' heights, or switch to the detailed method to add the child's age, current height, and weight. Results update in your browser and are not a diagnosis.
What the result means
How tall will my child be?
Start with a family-height estimate, not a final answer. The mid-parental height method estimates the center of a child's expected adult-height range from the heights of both biological parents. It is a quick screening reference, not a measurement of remaining growth and not medical advice.
±4 inches around the midpoint
AAP guidance gives a target range of 4 inches, or 10.2 cm, above and below the mid-parental estimate.
Growth is more than inheritance
Genes have a large influence, while health, nutrition, hormones, environment, and puberty timing can change the outcome.
Calculation method
How the two height estimates work
Quick estimate uses the AAP mid-parental formula and its broad family target range. Detailed estimate applies the age- and sex-specific Khamis–Roche coefficients to current height, weight, and the average of both parent heights.
Both published methods use female and male categories based on sex assigned at birth. They do not define gender identity and may not represent every variation in sex development.
Then show the target range 10.2 cm below and above the result.
Then show the target range 10.2 cm below and above the result.
The calculator uses the corrected half-year coefficient table for ages 4–17.5. It does not interpolate unpublished ages or treat the result as a diagnosis.
Limits and sources
Use the result as a rough reference
If a child's growth pattern is a concern, a pediatric clinician can review repeated measurements, growth charts, puberty timing, health history, and other clinical evidence. A single online estimate cannot do that assessment.
- Formula and range
The American Academy of Pediatrics mid-parental height guide supplies the female and male formulas and the ±4 in (±10.2 cm) target range used here.
- Growth assessment
The CDC guidance on growth charts says growth charts contribute to an overall clinical impression and are not intended as a sole diagnostic instrument.
- Why estimates vary
The NIH MedlinePlus Genetics overview of height explains that height reflects many genetic variants plus environmental and health factors, including nutrition.
- Detailed method
The original Khamis–Roche study in Pediatrics describes a model developed from white American children without growth-altering disease. Detailed mode keeps that population limit visible rather than presenting the result as universal.