Normal Distribution Calculator
The Normal Distribution Calculator makes it easy to compute cumulative
probability, given a normal random variable; and vice versa. For help in using
the calculator, read the FrequentlyAsked Questions
or review the Sample Problems.
To learn more about the normal distribution, go to Stat Trek's
tutorial on the normal distribution.

Enter a value in three of the four text boxes.

Leave the fourth text box blank.

Click the Calculate button to compute a value for the blank
text box.




Note: The normal distribution table, found in the appendix of
most statistics texts, is based on the
standard normal distribution, which has a
mean of 0 and a standard deviation of 1. To produce outputs
from a standard normal distribution with this calculator,
set the mean equal to 0 and the standard deviation equal to 1.
FrequentlyAsked Questions
Instructions: To find the answer to a frequentlyasked
question, simply click on the question. If you don't see the answer you need,
try the Statistics Glossary or
check out Stat Trek's tutorial on the normal
distribution.