Growth velocity calculator (cm/year)
A single height says little. Paediatricians look at growth velocity: how many centimetres a child grows per year. Enter two dated measurements to get the speed and how to read it.
Your result appears here. Measurements should be at least 6 months apart to be reliable.
Growth velocity–
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How to read growth velocity
- From age 6 until puberty: the Children’s Mercy (USA) clinical guide treats a speed below 4 cm/year in boys and below 4.5 cm/year in girls as a sign to have a doctor evaluate growth. Some children slow down just before puberty, so the doctor looks at the whole chart.
- During puberty: speed usually rises and then slows; there is no single threshold for every child.
- After puberty: speed falls towards zero. Pediatric Endocrine Society guidance uses below 2 cm/year as a sign that growth is nearly complete. Once growth plates close, no medical treatment can lengthen bones.
- Error: each measurement can be off by a few millimetres, and people are slightly shorter in the evening. Measure the same way at the same time — see how to measure at home.
Reference information, not a diagnosis. Sources: Children’s Mercy – Growth failure · Pediatric Endocrine Society · Nwosu et al., J Endocr Soc 2021.