Child Height Predictor
Predict your child's adult height from both parents' heights with the mid-parental method doctors use.
Predicted adult height
174 cm (5′ 9″)
- Likely range
- 165.5 to 182.5 cm
A son of these parents will most likely grow to about 174 cm (5′ 9″), and usually between 165.5 and 182.5 cm.
How it's worked out
- Mid-parental height
(175 + 160 + 13) ÷ 2174 cm
- The mid-parental method doctors use. Nutrition, health and sleep in childhood also matter. If you're worried about growth, see a paediatrician.
The formula
Boy: (father + mother + 13) ÷ 2 · Girl: (father + mother − 13) ÷ 2, ± 8.5 cm
Worked example
With a 175 cm father and a 160 cm mother, a son's predicted height is (175 + 160 + 13) ÷ 2 = 174 cm (about 5′ 9″), most likely between 165.5 and 182.5 cm. A daughter's is 161 cm.
Questions people ask
How do doctors predict adult height?
With the mid-parental height: for a boy, (father + mother + 13 cm) ÷ 2; for a girl, (father + mother − 13 cm) ÷ 2.
How accurate is it?
Most children end up within about 8.5 cm either side of the prediction. Nutrition, health and sleep during childhood matter too.
When should I worry about my child's growth?
If they fall well behind other children of their age, or stop growing, see a paediatrician, who can check growth charts and bone age.
About this calculator
Formula and rules last checked 25 October 2026Written and tested by the CalculatorDex teamReport a problem