Child Height Calculator
Predict your child's adult height using the mid-parental height formula based on both parents' heights.
Part of our Health Calculators collection.
Child Height Calculator
Free online calculator
5'10" = 70 inches
5'5" = 65 inches
Results update automatically as you type
How to Use This Calculator
- 1
Enter father's and mother's heights.
- 2
Select child's sex.
- 3
See predicted adult height and likely range.
Mid-Parental Height Formula (Tanner)
Boys: Predicted Height = (Father + Mother + 5 inches) / 2 Girls: Predicted Height = (Father + Mother − 5 inches) / 2 Accuracy: ±2 inches (1 standard deviation) About 95% of children fall within ±4 inches of prediction.
Example Calculation
Example: Father 5'10", Mother 5'5", boy
Inputs
fatherHeightIn: 70motherHeightIn: 65sex: male
Result
Predicted: 5'11" | Range: 5'9"–6'1"
(70 + 65 + 5) / 2 = 70 inches = 5'10".
Frequently Asked Questions
How accurate is this prediction?
The mid-parental height formula is accurate within ±2 inches (1 SD) for most children. Nutrition, health, and sleep significantly affect whether a child reaches their genetic potential.
Can I do anything to maximise my child's height?
Ensure adequate nutrition (protein, calcium, vitamin D), sufficient sleep (growth hormone peaks during deep sleep), and regular physical activity. Avoid smoking exposure. These help a child reach their genetic potential.