Height Prediction

If You're 6'4" at 12, How Tall Will You Be?

Estimated adult height based on CDC growth trajectory data. Results shown for both sexes — scroll down for the full breakdown.

Boys (Male)

7'3"

Range: 7'1" – 7'5"

6'4" at 12 is well above average for boys at 12 (roughly 90th–95th percentile).

Girls (Female)

6'9"

Range: 6'7" – 6'11"

6'4" at 12 is well above average for girls at 12 (roughly 90th–95th percentile).

These estimates use CDC 50th-percentile growth trajectory data. Individual results vary based on genetics, puberty timing, and nutrition. ±2 inches for ~80% of individuals.

Growth remaining

How much more will you grow at 12?

Boys

Boys at age 12 still have substantial growing ahead — typically 9–13 more inches before reaching adult height.

Girls

Girls at age 12 are approaching their adult height — typically 3–6 inches of growth remaining.

About this estimate

How we calculated this.

This prediction is based on CDC National Health and Nutrition Examination Survey (NHANES) growth chart data — specifically the 50th-percentile height trajectory for boys and girls from ages 10 to 20. By comparing the median adult height (age 20) to the median height at age 12, we estimate how many inches of growth remain for a typical person of that height and age.

For someone who is 6'4" at age 12: we calculate your expected remaining growth (boys: ~9–13 inches; girls: ~3–7 inches), add it to your current height, and display the result. A ±2 inch confidence range covers approximately 80% of real-world outcomes.

Important limitation: this estimate does not account for your parents' heights, which influence about 60–80% of adult height variation. A child of two tall parents who is 6'4" at 12 is likely to end up taller than predicted here; a child of shorter parents may end up shorter. For a more accurate prediction, use our full Khamis-Roche calculator — it incorporates parent heights and reduces the error to ±1.7–2.2 inches.

Puberty timing also matters significantly. Early developers at age 12 have already grown through part of their spurt; late developers still have that growth ahead. Our Growth Plate Status quiz can help estimate where you are in your development timeline.

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Want a more accurate prediction?

±2" precision

Khamis-Roche Calculator

Add your parents' heights to the prediction. The same method pediatric endocrinologists use — much more accurate than age alone.

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Growth Plate Status Quiz

Find out if you're still growing. This quiz estimates your growth plate closure stage based on age, puberty signs, and recent growth velocity.

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Frequently asked

Questions about height at 12.

Is 6'4" tall for a 12-year-old?

The CDC 50th percentile for 12-year-olds is about 4'11" for boys and 5'0" for girls. Many girls at 12 have already started their growth spurt, while most boys haven't yet. If you're significantly above 5'0" at 12, you're likely already in your spurt or have tall genetics.

Do boys or girls grow more between ages 12 and 18?

Boys typically grow significantly more after age 12 than girls do. Boys gain an average of 10–12 more inches between 12 and 18; girls typically add only 3–5 more inches, as their growth spurt usually peaks at 11–13. This is why boys who were the same height as girls at 12 often end up 5–6 inches taller as adults.

How accurate is a height prediction at age 12?

Moderately accurate. The main uncertainty is puberty timing — an early-puberty 12-year-old may have already grown 3–4 inches of their spurt, while a late-puberty 12-year-old has that growth still ahead. The Khamis-Roche method handles this by including current height and weight as inputs, which indirectly capture where someone is in their growth trajectory.

Browse all height predictions by age → Will I Be Tall? Index