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How Tall Will I Be?
A height calculator built on the methods clinicians actually use — your age, sex, current height and parent heights, turned into an estimate with an honest range.
Your estimate appears here — nothing you enter leaves your browser.
How this height predictor works
The calculator blends two methods clinicians have used for decades:
- Mid-parental (Tanner) target — your genetic anchor: add your parents' heights, adjust 13 cm up for boys or down for girls, and halve it. If a parent's height is missing, the model substitutes population averages and trusts this anchor less.
- Growth-curve projection — the share of adult height already reached at your age and sex. At 14, for example, boys have typically reached about 92% of their final height, girls about 97% — so your current height projects forward along that curve.
The two are weighted together, and the range around the result widens honestly when the model knows less — missing parent heights or more years of growth left both make the band wider. Every result is an estimate with a range, not a promise: genetics set the band, and the calculator never claims habits can push you beyond it.
Close to the end of growth (roughly 16–19 for girls, 18–21 for boys) the model deliberately reports the small window that typically remains rather than rounding you down to "done" — and past that window, it tells you plainly that this is your adult height.
Height prediction FAQ
How accurate is a height predictor?
No height predictor can promise a number — genetics set a range, and timing of puberty shifts the path through it. That's why this calculator always shows a range alongside the estimate, and widens it honestly when it knows less about you (for example, when parent heights are missing). Treat the middle number as the most likely outcome, not a guarantee.
Can I still grow after 16 or 18?
Often, yes — a little. Girls typically finish around 14–16 and boys around 16–19, but growth plates close on their own schedule, and late developers keep growing after their classmates stop. Near the end of that window the remaining amount is small — typically on the order of a couple of centimeters, not a growth spurt.
What if I don't know a parent's height?
Skip it. The model fills the gap with population averages and leans more on your own growth curve — and it widens the range to be honest about the extra uncertainty instead of pretending to know.
Do genetics decide everything?
Genetics set most of the range — roughly 80% of height variation is inherited. What sleep, nutrition and activity decide is whether you reach the top of your own range. They can't push you beyond it, but poor habits during the growth years can leave part of it unclaimed.
Is my data stored anywhere?
No. The estimate is computed locally in your browser. Nothing you enter is stored, sent anywhere, or used for tracking.
RIGHT NOW
Height comparison
See where your height ranks among people your age — your percentile in one tap.
FOR PARENTS
Child height predictor
Checking for your child? The parent version walks through the same method.
IN THE APP
The full prediction
GoTaller refines the estimate with your sleep, nutrition and activity — then coaches the habits daily.
The number is free. The plan is in the app.
GoTaller turns your estimate into a daily sleep, nutrition and posture plan — so the growth you have left doesn't go unclaimed.
Estimate only · not medical advice