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Quantitative Usability, Statistics & Six Sigma by Jeff Sauro
Z-Score to Percentile Calculator
by Jeff Sauro | December 3, 2007 :: RSS Subscribe to RSS Feed of Measuring Usability Updates

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Enter a z-critical value and get the area under the normal curve (a proportion). 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



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