Child Height Predictor
Predicted adult height from parent heights.
Enter your values
Enter the mother's height in in.
Enter the father's height in in.
Choose one of: Boy, Girl.
Results update instantly as you type — no submit needed. Your values are remembered on this device, and the shareable link reopens the calculator with exactly these numbers.
- Predicted adult height
- 69.5 in (176.5 cm)
- Likely range
- 65.5–73.5 in
- In feet
- 5′ 10″
- Mid-parental height
- 67 in
Quick answer
Mid-parental height predicts adult height within about 4 inches for most children.
Boys = (mother + father + 5in) ÷ 2
At a glance
| What it does | Predicted adult height from parent heights. |
|---|---|
| Category | Education |
| Inputs needed | Mother's height, Father's height, Child |
| Main output | Predicted adult height |
| Formula | Boys = (mother + father + 5in) ÷ 2 |
| Cost | Free — no sign-up, no download |
How to use the Child Height Predictor
- 1Enter both parents' heights.
- 2Select the child's sex.
- 3Read the prediction and its range.
Inputs explained
- Mother's height(in)
- Enter the mother's height in in.
- Father's height(in)
- Enter the father's height in in.
- Child
- Choose one of: Boy, Girl.
Worked example
Using the values the calculator loads with:
Inputs
- Mother's height64 in
- Father's height70 in
- ChildBoy
Results
- Predicted adult height69.5 in (176.5 cm)
- Likely range65.5–73.5 in
- In feet5′ 10″
- Mid-parental height67 in
Frequently asked questions
How accurate is this?
About ±4 inches — nutrition and puberty timing shift results.
Does it work for adopted children?
No — it depends on biological parents' heights.
What do I need to enter into the Child Height Predictor?
Just 3 values: mother's height, father's height, child. Every field starts with a realistic example, so you can change one number at a time and watch the result update instantly.
How does the Child Height Predictor work out the answer?
Mid-parental height predicts adult height within about 4 inches for most children. It applies the formula Boys = (mother + father + 5in) ÷ 2 and shows the working so you can check each step by hand.
Is the Child Height Predictor free, and do I need an account?
It is completely free with no sign-up, no download and no usage limit. Everything is calculated in your browser, so the numbers you type never leave your device.
Results are estimates for general information. For medical, legal, structural or financial decisions, confirm with a qualified professional.