Newborn Weight Percentile Calculator

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
84.1 %
Child Growth Percentile Calculator
Z-score (SD score)
1.00
Reference median for age
11.47
Percent of median
113.5 %
Chart used
Weight-for-age, 0 to 1856 days [weight-for-age]
Reference
WHO Child Growth Standards (2006)
Measurement used
13.018
Interpretation
Within the typical range, at percentile 84.1.
Worked out from CDC 2000 Growth Charts - percentile data files with LMS parameters and 5 other sources.
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: WHO Weight-for-age, 0 to 1856 days (girls).
  2. Reference parameters at 730 days: L = -0.294, M = 11.4741, S = 0.12389.
  3. z = ((X/M)^L - 1)/(L*S) = ((13.018/11.4741)^-0.294 - 1)/(-0.294 x 0.12389) = 1.000296
  4. Percentile = Phi(z) x 100 = 84.14%.
Reference percentile curve at this agetable
percentilevalueunit
39.159kg
59.414kg
109.825kg
2510.565kg
5011.474kg
7512.487kg
9013.5kg
9514.157kg
9714.607kg
Every chart these inputs supporttable
chartmeasurevaluezScorepercentile
Weight-for-age, 0 to 1856 daysweight-for-age13.0181.000384.14

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