Child Height Predictor
Predicts a child's adult height from the parents' heights using the mid-parental method, then shows a likely range of plus or minus 8.5 cm.
What this calculator does
The Child Height Predictor estimates your result instantly from the values you enter, using standard health & fitness formulas. Predicts a child's adult height from the parents' heights using the mid-parental method, then shows a likely range of plus or minus 8.5 cm. Calculations run in your browser, so nothing you type is sent to a server, and the output is an estimate rather than a certified or official figure.
Result
About Child Height Predictor
The Child Height Predictor uses the mid-parental method. It adds the mother's and father's heights, adds 13 cm for a boy or subtracts 13 cm for a girl, then divides by two.
Around that predicted height it shows a likely range of plus or minus 8.5 cm.
Formula & Mathematical Calculation
Predicted Height (cm) = f(Child Sex, Father Height (cm), Mother Height (cm))
Calculated according to standard health formulas implemented in the calculator core.
Calculation Example
For a boy with a father of 178 cm and a mother of 165 cm, the prediction is (178 + 165 + 13) ÷ 2 = 356 ÷ 2 = 178 cm.
The tool reports a Predicted Height of 178 cm and a Likely Range of 169.5 to 186.5 cm.
Key Benefits
- Predicts adult height from just the two parents' heights
- Applies the standard mid-parental adjustment of 13 cm
- Shows a realistic likely range, not just a single number
- Uses a separate adjustment for boys and girls
How to Use this Calculator
-
Select the child's sex
Choose Boy or Girl in the Child Sex dropdown. -
Enter parent heights
Type the father's and mother's heights in centimetres. -
Calculate
Select Calculate to see the predicted adult height and likely range.
Assumptions & Limitations
What the calculation assumes
- Every value you enter is treated as an exact, known amount.
- Any rate or interval you enter is assumed to hold for the whole period unless the form asks for it separately.
- Results use standard published formulas and account only for the values entered above.
- Rounding is applied for display; the underlying calculation uses your full precision.
- Results are returned in the same units you enter, unless the tool states the output unit.
What it does not cover
- Child Height Predictor produces a calculated result for reference and learning, not a certified or official measurement.
- Real-world outcomes differ when tolerances, rounding rules or local standards apply.
- Definitions and standards vary by region and change over time; verify the convention that applies to your case.
- Figures are only as accurate as the inputs you supply — check them before acting on the result.
- For work where the result carries real consequences, confirm it against an authoritative source.
Frequently Asked Questions
Free to use, no account needed. Calculations run in your browser, so nothing you type is sent to a server. Results are estimates — how we build and check our calculators.