Z-Score to Percentile Calculator

Enter a z-critical value and get the area under the normal curve (a percentage). Selecting two-sided provides the area above Z and below -Z. Selecting one side provides the area only above or below the Z-value. See also the interactive Graph of the Standard Normal Curve. To convert a percentage into a Z-Score use the Percentile to Z-Score Calculator.

 Shaded area is % of the area under the curve.Shaded area is % of the area under the curve.
Z-ScorePercent of Area100-Percent

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

Watch a Short Demo