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left to grow
Estimate only. Final height depends on genetics, nutrition, sleep and exercise. The most accurate result needs a doctor's bone-age (X-ray) test. Range is roughly ±8.5 cm.
Wondering how tall your child will grow up to be? This free height predictor estimates a child's eventual adult height using two widely used methods. It is fast, private (everything runs in your browser), and works on any phone or computer.
This calculator offers two ways to predict adult height. You can use either one, or both together for a more reliable estimate.
The mid-parental height (target height) formula is the method pediatricians use most often. It averages the parents' heights and adjusts for the child's sex:
The result is the predicted adult height, with a typical range of ±8.5 cm (±3.3 inches).
Enter your child's current age and height. The calculator compares their height to the World Health Organization (WHO) 50th-percentile growth charts and projects the same percentile forward to age 18. This is useful for older children whose current growth pattern is a stronger signal than their parents' heights.
| Age (years) | Boys (cm) | Girls (cm) |
|---|---|---|
| 2 | 87.1 | 85.7 |
| 3 | 96.1 | 95.1 |
| 4 | 103.3 | 102.7 |
| 5 | 110.0 | 109.4 |
| 6 | 116.0 | 115.1 |
| 7 | 121.7 | 120.8 |
| 8 | 127.3 | 126.6 |
| 9 | 132.6 | 132.5 |
| 10 | 137.8 | 138.6 |
| 11 | 143.1 | 145.0 |
| 12 | 149.1 | 151.2 |
| 13 | 156.0 | 156.4 |
| 14 | 163.2 | 159.8 |
| 15 | 169.0 | 161.7 |
| 16 | 172.9 | 162.5 |
| 17 | 175.2 | 162.9 |
| 18 | 175.7 | 163.1 |
The mid-parental formula is accurate within about ±8.5 cm (3.3 inches) for roughly two-thirds of children. It is an estimate, not a guarantee. A doctor's bone-age X-ray is the most accurate method available.
Girls usually stop growing around age 14–16, and boys around age 16–18, after the growth plates close at the end of puberty.
Good nutrition, adequate sleep and exercise help a child reach their full genetic potential, but they cannot push height beyond it. Severe malnutrition or illness can, however, reduce final height.
Height comes from both parents roughly equally, plus environmental factors. That is why the mid-parental formula averages the two parents' heights.
Disclaimer: This tool provides estimates for general information only and is not medical advice. For a personalized assessment of your child's growth, consult a pediatrician.