Average Height for 12-Year-Old Boys
Average height here means the median: the point where half of boys in the reference population at this age are taller and half are shorter. The table shows the distribution, not a clinical definition of healthy height.
Median (50th percentile)
149.1 cm (58.7 in / 4'10.7") — boys aged 12
Spread (±1 SD): 7.5 cm (141.6 – 156.6 cm)
| Percentile | Height (cm) | Height (ft / in) |
|---|---|---|
| 3rd | 135.4 | 4'5.3" |
| 10th | 139.7 | 4'7" |
| 25th | 144.1 | 4'8.7" |
| 50th | 149.1 | 4'10.7" |
| 75th | 154.1 | 5'0.7" |
| 90th | 158.8 | 5'2.5" |
| 97th | 163.4 | 5'4.3" |
How to read this table
A percentile ranks a measurement against a reference population of the same age and sex. A 12-year-old at the 75th percentile is taller than 75 out of 100 boys the same age, and shorter than the other 25. Percentiles are not grades: sitting on the 10th percentile is not a problem on its own, and sitting on the 90th is not an achievement.
Reference spread is not a health boundary
The displayed band runs from about 141.6 cm to 156.6 cm for boys in this reference. It is a statistical summary of the chart, not a threshold that separates healthy from unhealthy growth. Being inside or outside that band cannot establish a diagnosis.
Keep dates and measurements together
A single measurement shows one reference position. Dated measurements allow changes over an interval to be described, but neither a stable percentile nor a changing one establishes health on its own. A clinician can consider the record together with measurement quality and individual context.
Getting an accurate measurement
Home measurements are often off by a centimetre or more, and at this age a single centimetre can shift the percentile by several points. Measure against a flat wall with no skirting board, with heels, buttocks and shoulders touching the wall and the head looking straight ahead. Measure in the morning where possible — people are slightly taller after lying down all night.
Height percentile calculator questions and evidence-based answers
Can this reference chart predict my teenager's final adult height?
No. A stature-for-age chart shows where a teen currently ranks compared to a reference population. Because teens mature at different rates (bone age vs chronological age), an adolescent on the 25th percentile who matures later may end up taller than an early maturer on the 50th percentile. Final adult height requires tracking measured growth velocity, pubertal staging, and mid-parental target height.
How often should height be measured during puberty?
Measuring height every 3 to 6 months using consistent technique (same wall, barefoot, morning time) provides the most reliable record to calculate annualized growth velocity without being misled by daily diurnal height fluctuations.
Limits of this data
These are population reference values, not predictions. They say nothing about how tall any individual will end up, and they do not replace a clinician's assessment. The CDC 2000 charts describe a US reference population and may fit other populations less well.
When to speak to a clinician
If you are concerned about growth, puberty, symptoms, or an existing health condition, discuss the concern with a qualified clinician. You do not need to meet a calculator threshold or complete this assessment before asking for help. A reference chart cannot diagnose a condition or decide whether treatment is needed.
Data source: CDC 2000 stature-for-age — https://www.cdc.gov/growthcharts/data/zscore/statage.csv (436 reference rows, ages 2–20 years).
Method · Height Percentile Chart for 12-Year-Old Boys · Average Height for 12-Year-Old Boys
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