CDC Weight-for-Age Percentile (2-20 yr)
CDC 2000 weight-for-age percentile (LMS method): from sex, age, and weight → percentile, z-score, and the reference-range band for ages 2–20 years.
Open the calculator → Runs in your browser. Data leaves only if you deliberately send a problem report from the interactive tool.
Example
- Sex
- Female
- Age
- 8
- Weight
- 38.5
Result: Weight 38.5 kg at age 8 y: 97th percentile (z 1.9) — 95th percentile or above (high weight-for-age).
The tool opens with these values already filled in. Replace them with your own.
What the result means
- Transform
- the measured weight is converted to an age- and sex-specific z-score by the CDC LMS transform z = ((weight/M)^L − 1) / (L·S); the percentile is the standard-normal CDF of z.
- Bands
- the charted lines run 3rd to 97th percentile; below the 5th or at/above the 95th is conventionally flagged.
What you enter
- Sex
- Age (years, 2–20)
- Weight (kg)
How this is calculated
- Range
- weight-for-age applies to ages 2 to 20 years; beyond about 10 years the CDC pairs weight with BMI-for-age.
Kuczmarski RJ, Ogden CL, Guo SS, et al. 2000 CDC growth charts for the United States: methods and development. Vital Health Stat 11. 2002;(246):1-190. Read the source ↗
A reference and educational tool. Not medical, legal, or financial advice, and not a substitute for clinician judgment.