How Much More Will I Grow?

Remaining growth depends more on biological maturity than on a birthday, so no age table can measure exactly how many inches you have left. These complete tables do something narrower and transparent: for every age from 8 through 20, they reproduce the same sex-specific completion factor used by this site's calculator, apply it to the CDC 50th-percentile height at that age, and show the modeled growth left and adult estimate in both metric and imperial units.

Modeled growth left for boys ages 8–20

Modeled growth left for girls ages 8–20

Data and calculation: “CDC 50th height” comes from the National Center for Health Statistics Growth Charts Data Files and official stature-for-age CSV. “Model complete” reproduces the site's growthFrac() factors exactly: boys 72%, 75%, 78%, 81%, 84%, 87%, 91%, 95%, 98%, 99%, then 100%; girls 77%, 80%, 84%, 88%, 92%, 95%, 97%, 98.5%, 99.5%, then 100%. These are the calculator's fixed CDC-style approximation, not CDC-published clinical percentages. Growth left equals CDC median height ÷ model fraction − CDC median height; adult estimate is CDC median height ÷ model fraction.

How to use the table with your own height

The CDC-height row is a worked example for someone at the 50th percentile. To use your measurement, turn the completion percentage into a decimal, divide your current height by it, then subtract your current height. A 14-year-old boy at 170cm uses 0.91: 170 ÷ 0.91 gives a model estimate of 186.8cm, and 186.8 − 170 gives 16.8cm remaining. Use the same unit throughout.

To test a target, first calculate the gap. Growing from 5'7" to 6'0" means moving from 170.2cm to 182.9cm, a gain of 12.7cm or 5 inches. The fixed model leaves that much room for a typical 14-year-old boy but not a typical 15-year-old boy. That distinction is a model output, not permission to expect or promise the target.

Do not compare your current height with the table's “growth left” while ignoring the CDC median-height column. The remaining amount changes with the starting height because the calculation uses a fraction. The age row is also not a substitute for puberty stage: two people with the same birthday and height may have very different biological maturity.

Why age alone is a rough predictor

Puberty is the main reason averages miss individuals. Someone who matures early may have already completed more of adult height than the age factor assumes; a late maturer may have more left. The calculator asks about puberty because shifting the completion factor can change the projection more than rounding a height measurement ever will.

Growth is also uneven. A person may gain height quickly during a spurt and very little in another year. Comparing two careful measurements at least several months apart gives growth velocity, which is more informative than repeatedly measuring over a few days. Posture and time of day can move a home height reading without representing bone growth.

Parents' heights supply a separate genetic center. Health history, long-term nutrition, hormone conditions, chronic illness and some medicines can affect whether a person follows an expected curve. Ordinary food, sleep and exercise support health, but no supplement, stretch or routine can guarantee reaching a chosen height.

Limits and when to seek a real assessment

The tables are statistical estimates, not measurements of remaining bone growth. They have not been clinically validated for an individual and cannot replace a pediatrician. The completion factors are deliberately identical to the live calculator so the page and tool do not contradict one another, but they are still a simplified age-and-sex model rather than official CDC percentile outputs.

The 100% entries mean the simple calculator stops projecting additional height at those ages; they do not prove every person's growth plates have closed on that birthday. If growth appears unexpectedly slow or fast, puberty is unusually early or late, or a target-height concern is causing distress, discuss the pattern with a clinician. A pediatrician can review serial measurements and family history; when medically appropriate, bone-age imaging can add information that this table cannot observe.

Frequently asked questions

Use the table that matches your question

General educational information only. This page does not provide medical advice, diagnosis or treatment. If you are concerned about growth, speak to a pediatrician or family doctor.