Growth Velocity Calculator
Growth Velocity Calculator
Growth velocity measures how quickly a child is growing over a specific period — typically expressed in cm per year. It is one of the earliest indicators of growth problems, often detecting issues before they show up in static percentile measurements. A child may still be at the 50th percentile for height but showing a declining growth velocity, which could indicate an underlying condition such as a growth hormone deficiency, hypothyroidism, or chronic illness.
Normal growth velocity varies by age. Infants grow rapidly — about 25 cm in the first year. Growth slows to about 10–12 cm per year in the second year, then stabilizes at 5–7 cm per year until puberty. During puberty, growth accelerates again: boys may grow 8–14 cm per year and girls 7–12 cm per year. A sustained decrease in growth velocity below the normal range for age warrants evaluation by a pediatric endocrinologist.
Normal Growth Velocity by Age
- 0–1 year: ~25 cm/year
- 1–2 years: ~10–12 cm/year
- 2 years to puberty: ~5–7 cm/year
- Puberty (girls): ~7–12 cm/year (peak ~10 cm/year)
- Puberty (boys): ~8–14 cm/year (peak ~12 cm/year)
According to the AAP, a growth velocity below 5 cm/year in a prepubertal child is a red flag that requires further investigation. The workup may include evaluation for chronic disease, nutritional deficiency, endocrine disorders, and genetic conditions.
Growth Velocity Calculator
Growth Velocity Calculator
Frequently Asked Questions
What is growth velocity?
Growth velocity is the rate of growth over time, usually expressed in cm per year. It detects growth problems earlier than single percentile measurements because it shows whether growth is accelerating, stable, or falling off.
What is normal growth velocity for children?
Infants grow about 25 cm in the first year, then 10-12 cm in the second year. From age 2 until puberty, growth is about 5-7 cm per year. During the pubertal growth spurt, girls may grow 7-12 cm/year and boys 8-14 cm/year.
When is slow growth a concern?
A growth velocity below 5 cm per year in a prepubertal child is a red flag that warrants pediatric evaluation. Other warning signs include crossing down two or more percentile lines or a declining velocity on repeated measurements.
How long should measurements be apart?
For a meaningful velocity, measurements should be at least 6 months apart – ideally 12 months. Measurements taken too close together amplify measurement error, which can be several millimeters even with careful technique.
Authoritative Resources
Written by Dr. Michael Anderson, MD (Pediatrics) | Medically approved by Dr. Ahmed Raza, MD (Pediatrics) | Updated for 2026
Disclaimer: This calculator is for general informational purposes only and is not a substitute for professional medical advice. Always consult your pediatrician.
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