About Height Predictor Calculator
Height Predictor Calculator is a free website of height-prediction and growth-chart calculators. It estimates how tall a child or teenager is likely to be as an adult and shows where a height falls on the CDC growth chart. Every calculation runs in your browser; there is no account and nothing you enter is uploaded.
Who we are
The site is built and maintained by Dolphin Studio LLC, a small US software studio that makes free, no-login browser tools. We are software developers. We are not doctors, a clinic or a medical service, and nothing on this site is medical advice. For any concern about growth, speak to a pediatrician or family doctor.
What is on the site
- Height predictor: Khamis-Roche and mid-parental estimates together.
- Khamis-Roche method height calculator: the method, its formula and its limits.
- Mid-parental height calculator: target height from the parents alone.
- Height percentile calculator: CDC growth chart percentile and Z-score, ages 2 to 20.
- Baby height predictor: what can be estimated before age 4.
- Am I done growing?: typical growth left by age.
- Most accurate height predictor: the methods compared, with drawbacks.
- When do boys stop growing? and When do girls stop growing?: growth by age from the CDC charts.
- How tall will I be quiz: five questions, answered with the same published formulas.
Methods and sources
We use published methods and say where each number comes from. We do not invent formulas or accuracy figures; where we could not confirm a figure, the page says so.
- Khamis HJ, Roche AF. “Predicting adult stature without using skeletal age: the Khamis-Roche method.” Pediatrics. 1994;94(4):504–507; erratum 1995;95(3):457.
- Tanner JM, Goldstein H, Whitehouse RH. “Standards for children’s height at ages 2–9 years allowing for height of parents.” Archives of Disease in Childhood. 1970;45:755–762.
- Kuczmarski RJ, et al. “2000 CDC Growth Charts for the United States: methods and development.” Vital and Health Statistics 11(246), 2002; stature-for-age LMS data file from cdc.gov/growthcharts.
One caveat about our own work: the Khamis-Roche coefficient tables on this site were cross-checked against two worked examples and two independent open implementations, not against every digit of the original printed tables.
Why a prediction is only an estimate
Adult height depends on genetics, nutrition, health, sleep and the timing of puberty. The published methods describe what happened on average in the groups of children studied. An individual can land outside the stated range, and the studies behind these methods did not include every population. Treat every result here as a ballpark.
How the site is paid for
The site is free to use and may show advertising. Advertisers have no say in the calculators or the text.
Corrections and questions: see the Contact page.