Child Height Predictor
Estimate a child’s adult height from the parents’ heights using the mid-parental method.
US (ft, in)Metric (cm)
BoyGirl
Predicted adult height
5ft 10in
Likely range: 5ft 6in – 6ft 1in
Estimated with the mid-parental (target height) method. About 95% of children reach an adult height within ±4 in (±10 cm) of the prediction. Actual height also depends on nutrition, sleep and overall health.
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Mid-Parental Height Formula
The predicted adult height (target height) is based on both parents’ heights and the child’s sex:
- Boys: (father + mother + 13 cm) ÷ 2, or (father + mother) ÷ 2 + 2.5 in
- Girls: (father + mother − 13 cm) ÷ 2, or (father + mother) ÷ 2 − 2.5 in
Prediction Range
| Estimate | Value |
|---|---|
| Predicted adult height | Mid-parental result |
| Likely range (~95%) | Prediction ± 4 in (±10 cm) |
This is a genetic-potential estimate only. Nutrition, sleep, activity and health all affect final height. For growth concerns, consult a pediatrician.
Frequently Asked Questions
- How does the mid-parental height method work?
- You average the parents’ heights, then add 2.5 inches (about 6.5 cm) for a boy or subtract the same for a girl. In centimetres, add or subtract 13 cm after summing both parents and dividing by two.
- How accurate is the prediction?
- About 95% of children reach an adult height within ±4 inches (±10 cm) of the mid-parental estimate, which is why a likely range is shown alongside the single value.
- What else affects a child’s adult height?
- Genetics set most of the potential, but nutrition, sleep, physical activity, overall health and timing of puberty all influence final height.
- Can I track whether my child is on track?
- Yes. A pediatrician plots height on a growth chart over time. Steady tracking along a percentile curve is more informative than any single prediction.
- Does this work for any age?
- The mid-parental method predicts final adult height from the parents alone, so it does not depend on the child’s current age. It is a genetic-potential estimate, not a measurement of current growth.
📅 Last updated: June 2026 · Formulas follow standard banking / tax conventions · Results are for reference only.