Growth Chart Calculator

A percentile describes how a measurement compares with the CDC reference population of the same sex and age. For example, the 60th height percentile means the child’s height is higher than about 60% of children in that reference group. Percentiles are not “grades,” and a single point does not define health.

Height and weight percentiles use the CDC LMS method on the 2000 CDC stature-for-age and weight-for-age tables (ages 2–20). z-scores are converted to percentiles with the standard normal distribution. Age is matched to a published Agemos row (no L/M/S interpolation).

2 years through 20 years (24–240 months on CDC tables). Infant (0–2) and WHO charts are intentionally not included.

A boy of about 100.5 months with height 130 cm maps to the CDC male stature row at Agemos 100.5. Using that row’s L, M, and S values yields a z-score near 0 and a height percentile near the 50th—illustrating a measurement close to the reference median.

• Reference tool only; not diagnostic.
• Uses published CDC half-month bins; does not interpolate coefficients.
• Does not plot multi-visit growth velocity trajectories.
• Not for ages under 2 years or preterm-specific growth standards.

• CDC — Percentile Data Files with LMS Values
• CDC Growth Charts overview
• Flegal KM, Cole TJ. Construction of LMS parameters for the CDC 2000 growth charts. NHSR No. 63. 2013.