Teen Height Guide: How Tall Will You Be?

This section is written for teenagers who want a straight answer about their own growth. Almost everything else you will find on this topic is trying to sell you a supplement, an app subscription, or a stretching programme. None of those work. What follows is what is actually known — how much growing you probably have left, what genuinely affects it, and what is being marketed to you on the basis of nothing.

What a height predictor can and cannot tell you

A prediction is built from three things: how tall your parents are, how tall you are now relative to your age, and how far through puberty you are. Those inputs are genuinely informative, and together they land within a few centimetres for most people.

What they cannot do is give you an exact figure. You inherited a random half of each parent's genes, not their average, which is why siblings with the same parents routinely finish eight or ten centimetres apart. Anyone quoting your adult height to the decimal is dressing up an estimate.

Are you still growing?

This is the question underneath most of the others, and you can get a decent read on it yourself.

Signs you probably have growing left:

• You are still in puberty, or it started recently.
• Your shoe size has changed in the last year or two.
• You have grown more than 2 cm in the past twelve months.
• You are a boy under 16 or a girl under 14.

Signs you are probably close to finished:

• Puberty finished well over a year ago.
• Shoe size has been stable for a year or more — feet finish before legs do.
• Under about 1 cm of growth in the past year, measured properly.
• You are a girl two or more years past your first period, or a boy past 18.

Measure properly before you conclude anything: shoes off, heels and back against a wall, same time of day each time. You are up to a centimetre taller in the morning than at night, because the discs in your spine compress under the day's load. That single fact is responsible for a great deal of confusion — and for a great deal of misleading marketing.

There is more detail on this in can I still grow taller?, including the age tables and what a bone age X-ray shows.

Why your year group looks so uneven

The growth spurt does not arrive on a fixed date. Across normal, healthy people it starts anywhere in a three to four year window, so at 13 or 14 your year group contains people who finished their spurt and people who have not begun. The gap looks enormous and is almost entirely about timing.

Boys run about two years behind girls throughout. In a mixed class of 12-year-olds the girls are often visibly taller, and by 16 that has completely reversed. If you are a 14-year-old boy who has not started yet, the most useful information available to you is that not started is different from finished — starting late is associated with growing for longer, not with ending up shorter.

What actually affects your final height

Roughly 80% of the variation in adult height traces to genetics. That share is not something you can negotiate with. The remaining slice is worth taking seriously, but not for the reason it is usually sold.

• Sleep. Growth hormone is released in its largest pulses during deep sleep. Running on five or six hours through your growth years works directly against the mechanism doing the growing.
• Eating enough. A body adding 8 or 9 cm in a year needs both the raw material and the energy. Chronic undereating during your spurt is one of the few things that measurably reduces final height.
• Staying active and reasonably healthy. Supports normal bone development. It does not stretch you.

Details, including what specifically does not work and why, are in how to grow taller naturally.

The products aimed at you

Height insecurity in teenagers is a reliable market, and an entire category of apps and supplements exists to serve it. The pattern is consistent: a long questionnaire, a dramatic-looking analysis, a "potential height" you could supposedly unlock, and a subscription between you and the number.

Two things are worth knowing. First, no supplement, stretch, posture device or routine lengthens bone once your growth plates have closed — and while they are open, you are already growing without paying anyone. Second, the "potential height" these products display is generally the same mid-parental arithmetic you can do yourself in ten seconds with a calculator.

The predictor here is free and shows your result without an account. There is no paid tier holding the number hostage.

Frequently asked questions

This section is written for teenage readers. It provides general information and statistical estimates only — not medical advice, diagnosis or treatment. If you are worried about your growth, the person to ask is a doctor, ideally with a parent or carer involved.