How Tall Will My 14-Year-Old Be?
At 14, chronological age is no longer enough to estimate adult height. One child may be approaching final height, another may be at peak growth, and a late developer may still have most of the spurt ahead. Parents can make the estimate more useful by replacing a birthday-based guess with four pieces of evidence: the child's plotted growth curve, growth velocity over a full year, pubertal stage and family pattern. Together they support a range. They still cannot support a guaranteed final number.
Start with the right age-14 baseline
Girls typically begin, peak and finish their growth spurt about two years before boys. The difference is large enough that a single “age 14” rule would be misleading.
| At age 14 | Common position in puberty | Broad remaining-growth guide |
|---|---|---|
| Girls | Often past peak and slowing | About 2 – 5 cm for many |
| Boys | Often in or near peak growth | About 8 – 15 cm for many |
These figures are orientation, not an individual forecast. A girl whose first period began early may be close to finished, while a later-developing girl may have more growth left. A boy who entered puberty at 11 differs sharply from one with few signs at 14. Growth ends when growth plates fuse after puberty progresses, not when a child reaches a particular birthday.
Report a range, not a target. A wider interval may be the more accurate answer for a late-developing 14-year-old because more of the growth path remains uncertain.
Plot the curve and calculate yearly growth
Collect dated measurements from clinic records, school screenings and reliable home records. Plot them on the same growth-chart reference used for the child's age and sex. A single percentile is only a position today. The curve shows whether the child has tracked a consistent channel, risen during an early spurt or crossed downward over time.
Calculate growth velocity from measurements at least six months apart, ideally twelve. Use the same technique: shoes off, hard floor, fixed wall or stadiometer, head level and similar time of day. Height can vary by about a centimetre from morning to evening, so inconsistent timing can imitate or hide several months of growth.
Peak pubertal growth commonly reaches about 6 to 10 cm in a year. A teenager near completion may grow far less. The number only makes sense beside pubertal stage: 2 cm in a year can be expected after puberty is complete but deserves attention if puberty has barely begun. Avoid projecting one unusually fast or slow three-month interval across a whole year.
Add puberty timing and family history
For girls, menarche is the most practical landmark. It usually follows peak growth velocity, with about 5 to 7.5 cm of growth commonly remaining across the next one to two years. Record when periods began rather than simply marking puberty “started.” For boys, there is no equally visible single event. Voice change and facial hair generally occur after peak velocity, while the earliest pubertal changes precede the height spurt.
Ask both parents when they developed. Constitutional delay often runs in families; a father who remained short through school and grew after 16 is relevant evidence for a son following a similar curve. Also compare the child's trajectory with the mid-parental target range, which uses both parents' measured heights. A stable low percentile that fits two shorter parents is different from a falling curve far below a taller family's range.
Do not let family history overrule the record. “Everyone in our family grows late” is reassuring only when the child is still growing steadily and puberty is progressing. It is context, not a diagnosis.
Know which patterns justify paediatric review
Book a routine appointment if the child is crossing downward through percentile bands, has sustained unusually slow growth for their pubertal stage, or sits well below the family target range without a clear history of late development. No signs of puberty by 13 in girls or 14 in boys also merits assessment. Very early puberty — before 8 in girls or 9 in boys — deserves attention because it can use up growing time early.
Seek review when poor growth appears with persistent fatigue, poor appetite, weight loss, chronic diarrhoea or bloating, frequent headaches, or another ongoing symptom. These patterns do not prove a growth disorder. They help a paediatrician decide whether to check common, treatable causes such as thyroid disease, coeliac disease or chronic illness.
A doctor may remeasure the child, reconstruct the curve, assess pubertal stage and order a left-hand and wrist bone-age X-ray when the result would change management. Bone age can show whether skeletal maturity is ahead of or behind chronological age and whether substantial growth time remains.
Prepare an estimate and a useful appointment
The predictor on this page combines parental heights with the child's current trajectory and pubertal stage. Treat its output as a statistical estimate for planning questions, not a measurement or diagnosis. The interval matters more than the centre, especially when puberty timing is uncertain.
For an appointment, bring dates and values for height and weight, the source of each measurement, both parents' heights, medication and chronic-health history, puberty milestones and any family history of late development. Write a one-sentence summary such as: “Growth slowed from about 6 cm to 2 cm per year, and the curve crossed from the 50th to the 20th percentile over two years.” That gives the clinician a pattern to examine.
Discuss the estimate privately with your teenager before sharing it widely. Adult height is uncertain and personal. The purpose of tracking is to protect health and answer questions, not to turn a normal range into a performance target.
Frequently asked questions
How much more will my 14-year-old grow?
Many 14-year-old girls are slowing and may have roughly 2 to 5 cm left, while many 14-year-old boys are around their main spurt and may have roughly 8 to 15 cm left. These are broad ranges; pubertal stage and recent growth velocity matter more than age alone.
What is a normal growth rate at 14?
It depends on pubertal stage. Peak pubertal growth is commonly around 6 to 10 cm a year, while a teenager nearing the end may grow much less. Compare accurate measurements at least six to twelve months apart rather than judging one short interval.
How accurate is an adult-height prediction at 14?
It can provide a useful range when it combines parental heights, current height, growth history and pubertal stage. It cannot give an exact number. Predictions are usually less certain for a 14-year-old who has not started their main spurt.
When should a 14-year-old see a doctor about growth?
Arrange an assessment for sustained slow growth, downward crossing of percentile lines, no pubertal signs by 13 in girls or 14 in boys, very early puberty, or poor growth with symptoms such as fatigue, weight loss or digestive problems. None proves a disorder, but each deserves review.
What records should I take to a growth appointment?
Bring dated height and weight measurements from clinics, school records or home; both parents' heights; the child's medication and health history; puberty timing; and any family history of late growth. A timeline is more useful than today's height alone.
This page provides general information and statistical estimates for parents and carers — not medical advice, diagnosis or treatment. It cannot assess an individual child's growth or replace a clinical growth chart. If you are concerned about your child's growth or pubertal timing, speak to a paediatrician or family doctor.