Midparental Height Calculator
Predicted adult height from parents' heights.
Enter your values
Enter the father's height in in.
Enter the mother'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
- 5 ft 9.5 in
- In inches
- 69.5 in
- In centimetres
- 176.5 cm
- Likely range (±4 in)
- 5 ft 5.5 in to 6 ft 1.5 in
- Midparental average
- 67 in
Quick answer
Midparental height adds 5 inches to the mother's height for boys (or subtracts 5 from the father's for girls), averages the parents, and allows ±4 inches.
boys: (mother + 5in + father) ÷ 2
At a glance
| What it does | Predicted adult height from parents' heights. |
|---|---|
| Category | Health |
| Inputs needed | Father's height, Mother's height, Child's sex |
| Main output | Predicted adult height |
| Formula | boys: (mother + 5in + father) ÷ 2 |
| Cost | Free — no sign-up, no download |
How to use the Midparental Height Calculator
- 1Enter the father's height in inches.
- 2Enter the mother's height in inches.
- 3Select the child's sex.
Inputs explained
- Father's height(in)
- Enter the father's height in in.
- Mother's height(in)
- Enter the mother's height in in.
- Child's sex
- Choose one of: Boy, Girl.
Worked example
Using the values the calculator loads with:
Inputs
- Father's height70 in
- Mother's height64 in
- Child's sexBoy
Results
- Predicted adult height5 ft 9.5 in
- In inches69.5 in
- In centimetres176.5 cm
- Likely range (±4 in)5 ft 5.5 in to 6 ft 1.5 in
- Midparental average67 in
Frequently asked questions
How accurate is midparental height?
Roughly ±4 inches for 95% of children — nutrition, health and growth timing all shift the final result.
Can a child outgrow the prediction?
Yes. The formula is a genetic average; children regularly land outside the range, especially with early or late puberty.
What do I need to enter into the Midparental Height Calculator?
Just 3 values: father's height, mother's height, child's sex. 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 Midparental Height Calculator work out the answer?
Midparental height adds 5 inches to the mother's height for boys (or subtracts 5 from the father's for girls), averages the parents, and allows ±4 inches. It applies the formula boys: (mother + 5in + father) ÷ 2 and shows the working so you can check each step by hand.
Is the Midparental Height Calculator 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.