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Adult height projection is a rough forecast built from a child's present growth pattern, family height, and assumptions about maturation. The same measured height can read very differently once growth-curve position and parental stature are considered.
This calculator turns that question into a structured estimate. It starts from the child's current standing height, age in months, and sex-specific growth position, then compares that percentile-based projection with a mid-parental estimate derived from mother and father height.
That makes it useful for planning conversations rather than prediction theater. A 10-year-old girl at 138 cm may track near the middle of the reference curve, while a child of the same age at 128 cm can pull the forecast downward even when family heights suggest a taller adult endpoint.
The result is intentionally layered. You get a headline adult-height estimate, a displayed range, and separate fields that show how much of the forecast comes from current growth position versus parental context.
This calculator is an informational growth-planning aid, not a diagnosis, treatment plan, or substitute for professional assessment. A projected adult height does not mean a child will certainly reach that exact number, and this package does not use bone age, examination findings, or laboratory data.
A good first pass is conservative. Enter both parent heights in the correct unit, record the child's latest measured standing height in centimeters, keep Projection method mode on Age-weighted blended model, leave Projection blend override at 0, and keep Puberty timing offset at 0. That baseline lets Blended projected adult height reflect both the child's current growth position and parental context before you start stress-testing assumptions.
The tool is strongest when you have a recent, careful height measurement and want to compare current growth position with family-height expectations. It is much less helpful when the child's height is guessed casually, parental heights are uncertain, or the real question is diagnostic.
Once the baseline looks plausible, change one advanced assumption at a time. The most useful comparison is usually between the baseline result and one alternate row in Projection Scenarios.
The package starts by locating the child's current height on a sex- and age-specific reference curve. From Child sex, Current child age, Current child height, and Growth reference set, it derives a current z-score and converts that into Current height percentile.
Those reference sets are package approximations, not direct CDC or WHO LMS lookups. The tool interpolates anchored medians and standard deviations, applies WHO-style, CDC-style, or hybrid adjustments, builds Percentile-tracking adult estimate from the current z-score, and combines that with Mid-parental estimate.
In Age-weighted blended model, the age anchor increases the percentile-tracking share as the child gets older. Percentile tracking only sets the weight to 100%, Mid-parental anchored blend sets it to 35%, and Projection blend override replaces the automatic weight.
You should read the range and guidance separately. Age and Puberty timing offset affect the numeric Projected range. Projection confidence affects guidance wording and follow-up timing only. Current weight is contextual, and the tool-specific calculation path is browser-side.
The final forecast combines a percentile-tracking adult estimate with a mid-parental estimate, then applies a package-defined range around the blend.
| Symbol | Package field | Meaning here |
|---|---|---|
z_current |
Current height percentile (derived) | Current height position on the selected reference set. |
H_track |
Percentile-tracking adult estimate | Adult endpoint from the current z-score alone. |
H_mid |
Mid-parental estimate | Parental-height endpoint from the sex-adjusted mid-parental equation. |
w |
Effective percentile weight | Share of the final blend coming from the percentile-tracking side. |
H_blend |
Blended projected adult height | Final forecast shown in the headline result. |
u |
Projected range | Half-width of the displayed uncertainty interval. |
For boys the mid-parental equation adds 13 cm before dividing by 2. For girls it subtracts 13 cm. In the default mode, w comes from the age anchor (current age + puberty timing offset), divided by 180 and clamped between 35% and 90%.
The default package values show the interaction clearly. With a 120-month-old girl at 138 cm, the tool reports Current height percentile = 50th, Percentile-tracking adult estimate = 164.5 cm, and Mid-parental estimate = 162.5 cm. The age anchor stays at 120 months, so Effective percentile weight = 66.7%, the blend lands at 163.8 cm, and the half-range of 4.5 cm yields Projected range = 159.3-168.3 cm.
The guidance table is separate from the forecast math. It reads the finished metrics, then assigns attention levels and timelines from fixed package thresholds.
| Condition | Guidance effect | Important limit |
|---|---|---|
| Current height percentile < 10 or > 90 | Guidance moves into Watch, or into Priority when Intervention urgency is above routine. | This changes the guidance table, not the height equation. |
| Current height percentile < 3 or > 97 with Intervention urgency = Urgent | The top row can escalate to Immediate. | The forecast number still uses the same blend math. |
| |Puberty timing offset| >= 12 months | Guidance rises to at least Watch, or to Priority when urgency is higher. | This is a sensitivity warning, not proof. |
| Guidance follow-up interval, Intervention urgency, and Projection confidence | These shape timeline text such as Within 1 month or Within 3 months. | Projection confidence changes messaging and follow-up tone, not the numeric range. |
Use the sequence below if you want one clean baseline and one meaningful sensitivity check.
Keep one baseline and one alternate scenario so the tool shows uncertainty honestly instead of hiding it inside one exact-looking number.
Blended projected adult height is the best single read because it is the package's final mix of current growth position and parental context. Projected range is just as important. A centered estimate of 163.8 cm with a range of 159.3-168.3 cm means “roughly mid-160s,” not “exactly 163.8 cm.”
| Output cue | What it usually means here | What to verify next |
|---|---|---|
| Current height percentile < 10 or > 90 | Guidance leaves routine framing. | Open Projection Path Guidance and note the priority and timeline before you repeat the forecast elsewhere. |
| Current height percentile < 3 or > 97 | The current growth position is deep in the package's extreme banding. | Compare baseline and alternate scenarios instead of quoting one endpoint as settled. |
| |Puberty timing offset| >= 12 months | The scenario is deliberately sensitive to maturation timing. | Run the same case again at 0 months and compare the change in Projected range. |
The biggest false-confidence trap is assuming that a calm guidance tone or an average Current weight makes the forecast precise. It does not. Verify the last reliable height measurement, compare Percentile-tracking adult estimate with Mid-parental estimate, and keep the conversation provisional when those two fields diverge sharply.
Projected adult height is a planning estimate, not a diagnosis of short stature, tall stature, pubertal disorder, endocrine disease, or nutritional status. Serial measurements and, when appropriate, bone-age or other clinical workup can change the interpretation.
Because this package uses Current weight as context only. The forecast math depends on age, height, sex, parental heights, reference-set choice, projection mode, blend weighting, and puberty-timing offset.
That means the package could not build the parental-height anchor. Recheck Mother height, Father height, and Parent height unit. When it is unavailable, the result falls back toward the percentile-tracking side.
No. Here, Projection confidence changes the guidance tone and follow-up timing. It does not change Blended projected adult height or Projected range.
For a first run, start with Hybrid continuity model. Formal pediatric practice often uses WHO charts earlier and CDC charts later, but this tool applies simplified WHO-style, CDC-style, and hybrid adjustments. If changing the reference set materially moves Current height percentile, treat that as a comparability warning.
No. This package does not use radiographs, skeletal-maturity scoring, or bone-age equations. It stays in the lane of family-height context plus current growth position.