The Excel ASINH function calculates the inverse hyperbolic sine of a supplied number.
The format of the function is :
Where the number argument is the real number that you want to calculate the inverse sinh of. This can be input to the function either :
  directly 
  as a value returned from another function or formula, or 
  as a reference to a cell containing a value 
Column B of the spreadsheet below, shows examples of the Excel Asinh Function, used to calculate the inverse hyperbolic sine of three different values.
The formulas are shown in the spreadsheet on the left and the results are shown in the spreadsheet on the right.
Formulas:

Results:

Further information and examples of the Excel Asinh function can be found on the Microsoft Office website.