The KURT function returns the kurtosis of a data set.
Syntax
=KURT(num_1,[num_2], … )
Note: Beginning with Excel 2007, you can enter up to 255 number arguments to the function. Excel 2003 would only accept up to 30 number arguments.
Arguments
Argument  Description 

num_1  The first number, cell reference, or range for which you want the kurtosis 
[num_2], …  Optional. Additional numbers, cell references or ranges for which you want the kurtosis, up to a maximum of 255 
Note: Logical values and text representations of numbers, typed directly into the KURT function, are included in the calculation. However, logical values and any text values, including text representations of numbers, stored within an array of cells are ignored.
Examples
A  B  C  D  

1  Array1  Array2  
2  12  15  
3  17  18  
4  14  27  
5  13  16  
6  5  28  
7  
8  Formula  Result  Notes  
9  =KURT(A2:A6,B2:B6)  2.400732  Kurtosis of the data set A2:A6  
10  =KURT(A2:A6,B2:B6)  0.479978  Kurtosis of the data set A2:A6 and B2:B6 
Common Function Error(s)
Problem  What went wrong  

#VALUE  Occurs if any of the supplied number arguments that are supplied directly to the function are not recognized as numeric values


#DIV/0!  Occurs if either:

Kurtosis characterizes the relative peakedness or flatness of a distribution compared with the normal distribution. Positive kurtosis indicates a relatively peaked distribution. Negative kurtosis indicates a relatively flat distribution.
Kurtosis is defined as:
where s is the sample standard deviation.
See Wikipedia for more information on kurtosis.