Excel Function : CHISQ.DIST
Returns the cumulative beta probability density function
Microsoft Excel Reference Page
Syntax and Description of the CHISQ.DIST Excel Function
The syntax for the CHISQ.DIST function in Microsoft Excel is: CHISQ.DIST( x, k, cumulative ) where x is the value for which you want to calculate the probability, k is the number of degrees of freedom, and cumulative is a logical value that specifies whether you want the cumulative distribution function or the probability mass function.
About CHISQ.DIST Excel Function
The CHISQ.DIST function returns the one-tailed probability of the chi-squared distribution.