Estimate a child's adult height from the parents' height (Tanner method) and, if known, from the child's current height and age — two methods for comparison.
| Method | Formula |
|---|---|
| Tanner (boy) | (Mother's height + Father's height + 13) ÷ 2 |
| Tanner (girl) | (Mother's height + Father's height − 13) ÷ 2 |
| From current height | Current height ÷ (typical % of adult height at this age) |
About 70–80% of height is determined by genetics, the rest by nutrition, sleep, physical activity, and overall health. These methods give only an indicative estimate — if a child's height deviates from the expected range, consult a pediatrician.
The Tanner method has a margin of error of about ±8.5 cm for boys and ±9 cm for girls. The current-height/age method is usually more accurate for older children (±5–8 cm), but it is still only an estimate.
13 cm is the average height difference between adult men and women. The Tanner formula adjusts the average of the parents' height by this difference depending on the child's sex.
No. This is an indicative statistical estimate, not a medical diagnosis. If you are concerned about a child's growth (too fast/slow, deviating from the growth curve), consult a pediatrician.
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