Growth Weight Percentile Calculator

CDC recommends the WHO standards from birth to 23 months and the CDC charts from 2 to 20 years.
Not needed for the weight-for-length and weight-for-stature charts. The charts run to 240 months (20 years).
Recumbent length under 2 years, standing height from 2 years. Centimetres, or inches in US units.
Kilograms, or pounds in US units.
Percentile
3.0 %
Child Growth Percentile Calculator
Z-score (SD score)
-1.88
Reference median for age
7.45
Percent of median
79.9 %
Chart used
Weight-for-age, birth to 36 months [weight-for-age-infant]
Reference
CDC 2000 Growth Charts
Measurement used
5.954
Interpretation
Within the typical range, at the 3rd percentile.
Worked out from CDC 2000 Growth Charts - percentile data files with LMS parameters and 5 other sources.
CDC recommends the WHO growth standards, not the CDC charts, for children under 24 months.
A growth percentile is a screening number, not a diagnosis. Serial measurements plotted over time, taken with calibrated equipment, are what a clinician interprets. Discuss any concern with your paediatric provider.

How this is worked out

4 steps
  1. Chart: CDC Weight-for-age, birth to 36 months (girls).
  2. Reference parameters at 6.5 months: L = 0.35216407, M = 7.454854, S = 0.11489384.
  3. z = ((X/M)^L - 1)/(L*S) = ((5.9543/7.454854)^0.35216407 - 1)/(0.35216407 x 0.11489384) = -1.880794
  4. Percentile = Phi(z) x 100 = 3%.
Reference percentile curve at this agetable
percentilevalueunit
35.954kg
56.131kg
106.409kg
256.892kg
507.455kg
758.047kg
908.606kg
958.952kg
979.181kg
Every chart these inputs supporttable
chartmeasurevaluezScorepercentile
Weight-for-age, birth to 36 monthsweight-for-age5.954-1.88083

Results are general information, not financial, tax, legal, medical or engineering advice.