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z-Score Calculator: Standard Normal Distribution

Math Statistics Percentile

z-Score Calculator
Left Right Equal Area
Left Right Different Areas
Middle Equal Area
Middle Different Areas
Left z-Score:
Right z-Score
Left Tail Area:
Right Tail Area:
Total Area:


This calculator determines the area under the standard normal curve given z-Score values. The area represents probability and percentile values. The calculator allows area look up with out the use of tables or charts. In addition it provide a graph of the curve with shaded and filled area.

The z-score is the number of standard deviations from the mean.

The standard normal distribution is a normal distribution with a standard deviation on 1 and a mean of 0.


  1. Select area type.
  2. Adjust z-Score by using the steppers or manually entering the values.
  3. Note, the solutions will automatically be updated when either of the input date fields are modified or changed.

Area Types:

Flash/Flex version:

This calculator has been updated to use JavaScript. This allows the app to be used on smart mobile phones and tablets. The older Flash/Flex version is available via the link below.

z-Score Calculator (Old Version)

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