Adult Height Predictor
Predict how tall a child will be as an adult from the parents' heights, using the Tanner mid-parental method. Works in metric or imperial with a typical range.
Calculator by Toolsloft ↗- Predicted adult height
- 179 cm
- Typical range
- 170.5 to 187.5 cm
Estimate a child's adult height from the parents' heights using the mid-parental method. Enter both parents' heights and the child's sex to get a predicted height and a typical range. It is a quick genetic estimate, not a medical assessment.
How this is calculated
Uses the Tanner mid-parental (target height) method. Average the parents' heights, then add 6.5 cm for a boy or subtract 6.5 cm for a girl. Most children reach an adult height within about 8.5 cm of that target, which sets the range shown.
How to use
- Choose the child's sex.
- Enter the father's and mother's heights in cm or inches.
- Read the predicted adult height and the typical range around it.
Examples
- Boy:
father 180, mother 165 cm predicts about 179 cm - Girl:
father 170, mother 160 cm predicts about 158.5 cm
FAQ
- How accurate is this prediction?
- It is a genetic estimate. Most children land within about 8.5 cm of the mid-parental target, but nutrition, health, and timing of puberty all affect the final height.
- Why add or subtract 6.5 cm?
- The mid-parental method adjusts for the average height difference between adult men and women, roughly 13 cm, split as plus or minus 6.5 cm around the parents' average.
- Is this a medical tool?
- No. For growth concerns, a pediatrician can assess bone age and growth charts, which are more accurate than a parent-height estimate.
- How tall will my child be?
- Average the two parents' heights, then add 6.5 cm for a boy or subtract 6.5 cm for a girl. Most children reach an adult height within about 8.5 cm of that figure.
- Can you predict height from a child's current height?
- This tool uses parent heights, not the child's current height. A pediatrician can also estimate adult height from bone age and growth-chart percentiles, which track a child's own trajectory.