Biological Maturation Calculator
Predict adult height and place an athlete on the growth timeline (pre, circa, or post peak height velocity) from their own height, weight, and age plus both parents' heights, using the Khamis-Roche method.
Athlete & Family Inputs
This uses the Khamis-Roche method: the athlete's own height, weight, and age combined with both parents' heights predict adult height, and how close the athlete already is to that predicted height places them on a growth timeline (pre, circa, or post peak height velocity).
- Date of birth is required.
- Assessment date is required.
- Athlete's height must be greater than zero.
- Athlete's weight must be greater than zero.
- Mom's height must be greater than zero.
- Dad's height must be greater than zero.
This is an educational estimate from a population research model (Khamis-Roche), not a medical diagnosis, a guaranteed prediction of actual adult height, or an injury forecast, and it does not replace a physician or licensed clinician. Do not make medical, clearance, or return-to-play decisions from it — treat it as a coaching discussion starter for training load and program sequencing.
All calculations run in your browser. Nothing you enter here is sent to or stored by richburnett.net — the coach entering it is responsible for having the right to enter an athlete's data.
Download the build
Want the whole tool, not just a report? This bundle contains the complete source for this calculator: the Khamis-Roche math, its tests, and the component used on this page. Feed it to an LLM to ask questions, extend the tool, or port it to another language. The calculator itself, every input and result above, and the free PDF report stay free forever — this is only for the take-home source.
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