VBA IsError Function in Excel

VBA IsError function in Excel is categorized as an Information function in VBA. It is a built-in function in MS Office Excel. It checks specified Expression has an error or not. We have different error values such as #N/A, #DIV/0!, #NUM!, #NULL!,#NAME?, #REF! and #VALUE!. This function returns True if an expression contains an error, Otherwise it returns False.

The IsError function can be used in either Excel Worksheet function or as VBA function. The VBA IsError function can be used in either procedure or function in a VBA editor window in Excel. We can use this VBA IsError function any number of times in any number of procedures or functions. In the following section we learn what is the syntax and parameters of the IsError function, where we can use this VBA IsError function and real-time examples.

Table of Contents:

Objective
Syntax of VBA IsError Function
Parameters or Arguments
Where we can apply or use VBA IsArray Function?
Example 1: Check an expression(0/100) is an error or not
Example 2: Check an expression(100/0) is an error or not
Example 3: Check an expression(CVErr(8)) is an error or not
Instructions to Run VBA Macro Code
Other Useful Resources

Syntax of VBA IsError Function

The syntax of the VBA IsError function is

IsError(Expression)

Note: This IsError function returns a Boolean value,

Parameters or Arguments:

There is one mandatory parameter or argument for the IsError Function.
Where
Expression: The Expression is a mandatory argument. The Expression that you want to test.

Where we can apply or use the VBA IsError Function?

We can use this VBA IsError function in MS Office 365, MS Excel 2016, MS Excel 2013, 2011, Excel 2010, Excel 2007, Excel 2003, Excel 2016 for Mac, Excel 2011 for Mac, Excel Online, Excel for iPhone, Excel for iPad, Excel for Android tablets and Excel for Android Mobiles.

Example 1: Check an expression(0/100) is an error or not

Here is a simple example of the VBA IsError function. This below example checks the specified expression(0/100) is an error or not. The output of below macro is TRUE.

'Check an expression(0/100) is an error or not
Sub VBA_IsError_Function_Ex1()
    
    'Variable declaration
    Dim iExpression
    Dim sOutput As Boolean
       
    iExpression = 0 / 100
    
    sOutput = IsError(iExpression)
   
    'Display output message
    MsgBox "The expression(0/100) is an error or not : " & sOutput, vbInformation, "VBA IsError Function"
    
End Sub

Output: Here is the screen shot of the first example output.

Example 2: Check an expression(100/0) is an error or not

Here is a simple example of the VBA IsError function. This below example checks the specified expression(100/0) is an error or not. The output of below macro is TRUE.

Note: In the below example Sheets(“Sheet1”).Range(“A1”) has – ‘100/0’

'Check an expression(100/0) is an error or not
Sub VBA_IsError_Function_Ex2()
    
   'Variable declaration
    Dim sOutput As Boolean
          
    sOutput = IsError(Sheets("Sheet1").Range("A1"))
   
    'Display output message
    MsgBox "The expression(100/0) is an error or not : " & sOutput, vbInformation, "VBA IsError Function"
    
End Sub

Output: Here is the screen shot of the second example output.

Example 3: Check an expression(CVErr(8)) is an error or not

Here is a simple example of the VBA IsError function. This below example checks the specified expression(CVErr(8)) is an error or not. The output of below macro is TRUE.

'Check an expression(CVErr(8)) is an error or not
Sub VBA_IsError_Function_Ex3()
    
    'Variable declaration
    Dim iExpression
    Dim sOutput As Boolean
    
    iExpression = CVErr(8)
          
    sOutput = IsError(iExpression)
   
    'Display output message
    MsgBox "The expression(CVErr(8)) is an error or not : " & sOutput, vbInformation, "VBA IsError Function"
    
End Sub

Output: Here is the screen shot of the third example output.