HEIGHTMOG
Height Prediction

If You're 4'11" at 18, 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)
4'11"
Range: 4'9" – 5'1"

4'11" at 18 is below average for boys at 18 (roughly 10th–20th percentile).

Girls (Female)
4'11"
Range: 4'9" – 5'1"

4'11" at 18 is below average for girls at 18 (roughly 10th–20th 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 18?

Boys

Boys at age 18 have essentially reached their adult height.

Girls

Girls at age 18 have essentially reached their adult height.

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 18, we estimate how many inches of growth remain for a typical person of that height and age.

For someone who is 4'11" at age 18: we calculate your expected remaining growth (boys: ~0–2 inches; girls: ~0–2 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 4'11" at 18 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 18 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.

Get a better answer

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 18.

Can I still grow taller at 18?

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It's possible but uncommon, especially for girls. The CDC 50th percentile shows boys at 18 averaging 0.2 more inches of growth; girls at 18 averaging 0.1 more inches. Some 18-year-old males — particularly late puberty developers — may still add 0.5–1 inch. Growth plates typically close between 18–19 for males, earlier for females.

Is 4'11" my final height if I'm 18?

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For most 18-year-olds, yes — especially females. Growth plate closure is the definitive answer: once your epiphyseal plates fuse, height increase stops. An X-ray can confirm this. Without an X-ray, if you haven't grown more than 0.5 inches in the past year and are past mid-to-late puberty, you've likely reached your adult height.

What factors can affect my height after 18?

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Once growth plates close, actual height gains are not possible. However, posture improvements, spinal disc hydration, and core strength can affect measured standing height by 0.5–1 inch. Some people gain a small amount through late spinal growth into their early 20s. Sleep, nutrition, and low-stress environments support whatever residual growth potential remains.

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