Normal Distribution Calculator/Table

The first calculator allows to enter the mean, standard deviation, and cutoff points; the area under the normal distribution is computed. The second calculator does just the reverse. These calculators can be used instead of a table of the normal distribution.

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Choose parameters and the area will be computed.
Your browser does not appear to run Java which is required for this calculator.



Choose parameters and the cut-off points will be calculated.
For example, to get the Z for a 95% confidence interval, make the shaded area 0.95. Then choose "between" and you will see that .95 of the area is between -1.96 and 1.96.

Java Required for this applet For an alternative try this page which is compatible iPad and iPhone since it is based on HTML5.


The normal distribution is one of the most important distributions. It is the basis of many statistical tests and analyses. It is also used by some in risk analysis although it has been claimed by Nicholas Taleb that such use is a "Great Intellectual Fraud."
(PDF of a chanpter from Taleb's book "Fooled by Randomness"

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