For example, to obtain the 5th percentile of weight-for-age for a 9-month-old male, we would look up the L, M and S values from the WTAGEINF table, which are L=-0.1600954, M=9.476500305, and S=0.11218624. For the 5th percentile, we would use Z=-1.645. Using the equation above, we calculate that the 5th percentile is 7.90 kg. To obtain the z-score (Z) and corresponding percentile for a given measurement (X), use the following equation:

An easier way to calculate z-scores in Excel is with the STANDARDIZE function. It looks like this: ... The x is the value you want to turn into a z-score. The mean and standard_dev are pretty self explanatory. In our spreadsheet above, then, we could have had this in cell B2: ... A2 is the ...

The formula for computing a z-score is =(DataValue-Mean)/StDev.

November 6, 2025 - This tutorial discusses what percentiles are, what they are used for, and how to calculate them in Excel, with examples.

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3 days ago - Find out how to calculate percentile rank using percentiles, how you can calculate percentile range between two test scores and how to apply the formula.

March 30, 2020 - It turns out that a z-score of 1.78 corresponds to a percentile of roughly 96.2. In plain English, this means a data value that has a z-score of 1.78 is larger than roughly 96.2% of all other data values in the dataset. We can use the following built-in Excel function to convert a percentile to a z-score:

July 23, 2025 - Then, we use the pnorm() function, which calculates the cumulative probability up to that Z-score under the standard normal distribution. By multiplying the result by 100, we convert this probability into a percentile.

For Example, you have data in your column A, then in column B, you can calculate z-score against each value with formula as follows: =(A1-AVERAGE($A$1:$A$10))/STDEV.P($A$1:$A$10) Note that STDEV.P returns standard deviation of population.

May 14, 2025 - The 2x1001 table with z-scores and their corresponding percentiles are in a 'Supplemental' sheet.

Although this function is still available for backward compatibility, you should consider using the new functions from now on, because this function may not be available in future versions of Excel. For more information about the new functions, see PERCENTILE.EXC function and PERCENTILE.INC function. ... If k is non-numeric, PERCENTILE returns the #VALUE! error value. If k is < 0 or if k > 1, PERCENTILE returns the #NUM! error value. If k is not a multiple of 1/(n - 1), PERCENTILE interpolates to determine the value at the k-th percentile.

November 15, 2017 - NORMSDIST or NORM.S.DIST (depending on your ver. of Excel) will give the percentile. ... Use the NORM.S.DIST function to convert Z Scores to Percentiles, as in the table below.

March 29, 2022 - by Zach Bobbitt Posted on Last updated on March 29, 2022 · You can use the PERCENTRANK function in Excel to calculate the rank of a value in a dataset as a percentage of the total dataset.

June 26, 2025 - Z-score definition. How to calculate it (includes step by step video). Hundreds of statistics help articles, videos.

June 3, 2025 - Let’s go back to the z-score for our apple (0.667) from before. We’ll use it to calculate its weight percentile. A percentile is the proportion of a population that falls below a value. Consequently, we need to find the area under the standard normal distribution curve corresponding to the range of z-scores less than 0.667.

Download this calculator in an excel file or take a Crash course in Z-scores

For instance, the 84th percentile corresponds to a Z Score of 1, meaning that 84% of the data points in a dataset fall below the value with a Z Score of approximately 1. The Percentiles to Z Score Chart typically includes two columns: Percentile and Z Score. By using this chart, you can quickly determine the Z Score associated with a given percentile and vice versa.

September 22, 2024 - In Excel, convert Z-scores to percentiles using =NORM.S.DIST(z_score, TRUE).

Boys table- Weight-for-age: Birth to 5 years (z-scores) Download: PDF ǀ Excel · Girls table- Weight-for-age: Birth to 13 weeks (percentiles) Download: PDF ǀ Excel · Girls table- Weight-for-age: Birth to 5 years (percentiles) Download: PDF ǀ Excel · Boys table- Weight-for-age: Birth to 13 weeks (percentiles) Download: PDF ǀ Excel ·