CDC Mid-Upper Arm Circumference for 2 months to 18 years for U.S. Children

Uses the 1999-2012 CDC Child Growth Standards for mid-upper arm circumference-for-age, to report percentiles and Z-scores on children from 2 months to 18 years of age.

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])




From 2 to 222 months
Male Female
Age (months)
OR Date of birth
and Date of measure
Arm circumference (cm)
Optional: GA at birth

Tips and Tricks

  • Valid ages from 2 to 222 months
  • Mid-upper arm circumference: cm assumed. To enter inches, enter #"; e.g., 1" for 1 inch
  • Gestational age, enter in the form of ## #/7; e.g., 30 3/7 for 30 weeks and 3 days gestation

Based on