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MS Excel: ISNULL Function (VBA)

Learn how to use the Excel ISNULL function with syntax and examples.


The Microsoft Excel ISNULL function returns TRUE if the expression is a null value. Otherwise, it returns FALSE.


The syntax for the Microsoft Excel ISNULL function is:

IsNull( expression )

Parameters or Arguments

expression is a variant that contains a string or numeric value.

Applies To

The ISNULL function can be used in the following versions of Microsoft Excel:

  • Excel 2013, Excel 2011 for Mac, Excel 20010, Excel 2003, Excel XP, Excel 2000

Type of Excel Function

The ISNULL function can be used in Microsoft Excel as the following type of function:

  • VBA function (VBA)

Example (as VBA Function)

The ISNULL function can only be used in VBA code in Microsoft Excel.

Let's look at some Excel ISNULL function examples and explore how to use the ISNULL function in Excel VBA code:

IsNull(null) would return TRUE
IsNull("Tech on the Net") would return FALSE

For example:

Dim LValue As Boolean

LValue = IsNull("Tech on the Net")

In this example, the variable called LValue would contain FALSE as a value.