Growth Charts for Children With Down Syndrome

Uses the Zemel 2015 growth charts for children with Down syndrome in the United States to report percentiles and Z-scores.

Includes weight, height, head circumference for age, as well as BMI for age.

This calculator is for children from 2 to 20 years of age. For infants aged 0 to 36 months, there is a separate web calculator.

There are small differences in the calculations from the Zemel et al 2015 publication supplementary materials, likely due to rounding errors.

Citing: If you use PediTools for a publication or clinical guideline, please consider citing: Chou JH et al., J Med Internet Res 2020;22(1):e16204 (available open access [PDF])

Growth: from 2 to 20 years

Male Female
Age (months)
OR Date of birth
and Date of measure
Weight (kg)
Head circumference (cm)
Height (cm)

Optional: GA at birth

Tips and Tricks

  • Valid ages from 2 to 20 years
  • Age: months assumed. To enter years and months, enter #y #m; e.g., 4y 5m
  • Weight: kg assumed. To enter pounds and ounces, enter #-#; e.g., 8-4 for 8 lb and 4 oz
  • Head circumference: cm assumed. To enter inches, enter #"; e.g., 19" for 19 inches
  • Height: cm assumed. To enter feet and inches, enter #' #"; e.g., 4' 5" for 4 feet 5 inches
  • Gestational age, enter in the form of ## #/7; e.g., 30 3/7 for 30 weeks and 3 days gestation

Based on