The Height Percentile Calculator is a free tool that helps you calculate height percentile using the formula Mid-parental height: boys = (father + mother + 13)/2; girls = (father + mother - 13)/2. Enter your values above and press Calculate to get predicted adult height instantly, with a full step-by-step breakdown.
What is the Height Percentile Calculator?
The height percentile calculator is a free online tool that helps you calculate height percentile quickly and accurately. It applies the standard formula Mid-parental height: boys = (father + mother + 13)/2; girls = (father + mother - 13)/2 to the values you enter and, when you press Calculate, displays the result together with a clear, step-by-step explanation of how the answer was reached.
How to use the Height Percentile Calculator
- Enter both parents' heights.
- Choose the child's gender.
- See the predicted adult height.
Formula used
The height percentile calculator is based on this formula:
Mid-parental height: boys = (father + mother + 13)/2; girls = (father + mother - 13)/2Each term in the formula corresponds to one of the inputs explained below. The calculator performs the arithmetic for you and shows every step so you can check the working by hand if you wish.
Worked example
Suppose you enter Father 175, mother 162, boy. The calculator works as follows:
| Inputs | Father 175, mother 162, boy |
|---|---|
| Working | (175+162+13)/2 |
| Result | about 175 cm (+/- 8.5 cm) |
Step-by-step calculation
- Apply the formula:
Mid-parental height: boys = (father + mother + 13)/2; girls = (father + mother - 13)/2 - Substitute your values: (175+162+13)/2
- Read the result: about 175 cm (+/- 8.5 cm)
Inputs explained
- Father's height (cm) โ the father's height used in the calculation.
- Mother's height (cm) โ the mother's height used in the calculation.
- Child's gender โ the child's gender used in the calculation.
Understanding your result
- Predicted adult height โ the calculated predicted adult height in cm.
Benefits and practical uses
The height percentile calculator saves time and removes the risk of manual errors when you need to calculate height percentile. It is useful for students, professionals and anyone who wants a fast, dependable answer. Results update the moment you press Calculate, work on any device, and can be copied or shared in a single click โ and because the maths runs in your browser, your figures stay completely private.
Tips for an accurate result
- Keep all related inputs in the same units.
- Use the worked example above to confirm you are entering values in the right places.
- Review the assumptions below so the result fits your situation.
- Press Reset to clear everything and try a different scenario.
Common mistakes to avoid
- Entering values in the wrong unit (mismatched units give wrong answers).
- Leaving a required field empty โ the calculator will ask you to fill it in.
- Treating the result as a diagnosis instead of a general guide.
Assumptions and limitations
- Mid-parental height method.
Frequently asked questions
How accurate is this?
Mid-parental height predicts within about +/- 8.5 cm; nutrition and health also matter.
How do I use the Height Percentile Calculator?
Enter your values in the fields, then press the Calculate button to see the result. Use Reset to clear the form and start again. Nothing is calculated until you click Calculate.
What formula does the Height Percentile Calculator use?
It uses the standard formula: Mid-parental height: boys = (father + mother + 13)/2; girls = (father + mother - 13)/2. The full step-by-step working is shown with every result so you can verify it.
What information do I need to use the height percentile calculator?
You need: father's height, mother's height, child's gender. Sensible example values are pre-filled so you can see how it works.
Is the Height Percentile Calculator free to use?
Yes. Every DigiToolkit calculator is completely free, with no sign-up, no login and no usage limits.
Does the Height Percentile Calculator work on mobile phones?
Yes. The calculator is mobile-first and works on phones, tablets and computers in any modern browser.
Do I need to install an app?
No. The height percentile calculator runs directly in your web browser โ there is nothing to download or install.
Is my data private when I use this calculator?
Yes. All calculations run inside your browser. The numbers you enter are never uploaded to a server or shared with anyone.
How accurate is the Height Percentile Calculator?
It uses the generally accepted formula for height percentile and computes to several decimal places. Results are accurate for the assumptions listed on this page.
Can I copy or share my result?
Yes. After calculating, use the Copy button to copy the result, or Share to copy the page link.
Why is nothing showing until I press Calculate?
By design, the calculator only computes when you press Calculate, so you can finish entering all your values first. Press Reset any time to clear everything.
What units does the Height Percentile Calculator use?
It works with cm. Keep your inputs in consistent units for an accurate result.