Predicted Adult Height
5'10"
Range
68.1–72.1 in
Method
Blended
Leave current height blank to use mid-parent method only.
Predicted Adult Height
5'10"
70.1 inches
Low Estimate
5'8"
High Estimate
6'0"
Predictions are estimates based on genetic and growth data. Actual adult height can be influenced by nutrition, health, and other factors. Consult a pediatrician for clinical assessment.
Inputs
Result
Mid-parent = (70 + 64 + 5) / 2 = 69.5". Khamis-Roche = 43 / 0.61 = 70.5". Blended (40% mid + 60% KR) = 69.5 × 0.4 + 70.5 × 0.6 = 70.1". Range = ±2 inches.
Inputs
Result
Mid-parent (girl) = (72 + 66 - 5) / 2 = 133 / 2 = 66.5 inches = 5'6.5". Range = ±2 inches = 64.5-68.5 inches.
The most common method is the mid-parent formula: add both parents' heights, add 5 inches for boys or subtract 5 for girls, then divide by 2. This gives a prediction accurate to within 2-3 inches. The Khamis-Roche method uses the child's current height and age for better accuracy.
| Method | Inputs | Accuracy | Best For |
|---|---|---|---|
| Mid-Parent | Parent heights + sex | ±2-3 inches | Quick estimate, any age |
| Khamis-Roche | Current height + age + parents | ±1.5 inches | Children 4+ |
| Bone Age | X-ray of left hand | ±1 inch | Clinical assessment |
| Double at 2 | Height at age 2 | ±2-3 inches | Quick rule of thumb |
The mid-parent method is accurate within 2-3 inches (5-7.5 cm) for about 68% of children. Genetics determine 60-80% of final height, but nutrition, sleep, exercise, and health during childhood can shift the actual result. The prediction improves when combined with the child's current growth data.
Khamis-Roche predicts adult height using the child's current height and weight, parent heights, and age. It divides current height by the age-specific percentage of adult height reached. A 5-year-old boy at 43 inches who has reached 61% of adult height predicts 43/0.61 = 70.5 inches.
| Age (Boys) | % Adult Height | If Current = 40" | Predicted Adult |
|---|---|---|---|
| 4 years | 57.4% | 40/0.574 | 69.7" |
| 6 years | 64.4% | 40/0.644 | 62.1" |
| 8 years | 71.1% | 40/0.711 | 56.3" |
| 10 years | 77.4% | 40/0.774 | 51.7" |
| 12 years | 84.0% | 40/0.840 | 47.6" |
Height predictions become more accurate after age 4, with the best accuracy at ages 8-12 before the pubertal growth spurt. By age 2, a child has reached about 50% of adult height (the "double at 2" rule). After puberty begins, predictions are less reliable due to variable timing of the growth spurt.
Nutrition accounts for 20-40% of height variation, especially adequate protein, calcium, vitamin D, and zinc during growth years. Chronic illness, hormonal disorders, sleep deprivation, and severe stress can reduce growth. Children in developed countries average 2-3 inches taller than two generations ago due to better nutrition.
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Last Updated: Mar 25, 2026
This calculator is provided for informational and educational purposes only. Results are estimates and should not be considered professional financial, medical, legal, or other advice. Always consult a qualified professional before making important decisions. UseCalcPro is not responsible for any actions taken based on calculator results.