Percentile to Z-Score Calculator

Enter the area under the normal curve (a proportion between 0 & 1) and get the Z-critical value, one-sided or two-sided. To convert a Z-Score into a percentage use the Z-Score to Percentile Calculator. See also the interactive Graph of the Standard Normal Curve.

 Shaded area has a z-score of
Proportion of AreaZ-Score

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