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Growth Chart Calculator

Unit
Gender
Age:
months
Height
feet
inch
Height
cm
Weight
pound
Weight
kg
Head
feet
inch
Head
cm
Calculator Description

You can use baby gowth calculator to find your baby's growth percentile. Based on your input, baby gowth calculator will find the percentile of height, weight and head circumference for your baby. Baby gowth calculator will also generate a table to show the 5th, 10th, 25th, 50th, 75th, 85th and 95th value for each measurement. The percentile value is based on CDC growth charts data tables.

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The CDC growth charts data files
CDC growth chart data files is the source to produce the well known 2000 CDC Growth Chart for United States. These files contain the L, M, and S parameters needed to generate exact percentiles and z-scores along with the percentile values. The LMS parameters are the median (M), the generalized coefficient of variation (S), and the power in the Box-Cox transformation (L). To calculate the value (X) of a given physical measurement at a particular z-score or percentile, use the following equation: \[ X = M(1+LSZ)^{\frac{1}{L}}\ if\ \ L \neq 0 \] \[ X = M e^{SZ}\ if \ \ L = 0 \] For a given mreasurement(X), we can use the following formula to calcualte the z-score(Z) and then we can use the standard normal distribution function to find the percentile from the z-score: \[Z = \frac{(\frac{X}{M})^L - 1}{LS} \ if \ L \neq 0 \] \[Z = \frac{ln(\frac{X}{M})}{S} \ \ if L = 0 \]