totn Excel Functions

MS Excel: How to use the ISNULL Function (VBA)

This Excel tutorial explains how to use the Excel ISNULL function with syntax and examples.

Description

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

The ISNULL function is a built-in function in Excel that is categorized as an Information Function. It can be used as a VBA function (VBA) in Excel. As a VBA function, you can use this function in macro code that is entered through the Microsoft Visual Basic Editor.

Syntax

The syntax for the ISNULL function in Microsoft Excel is:

IsNull( expression )

Parameters or Arguments

expression
A variant that contains a string or numeric value.

Returns

The ISNULL function returns TRUE if the expression is a NULL value.
The ISNULL function returns FALSE if the expression is not a NULL value.

Applies To

  • Excel for Office 365, Excel 2019, Excel 2016, Excel 2013, Excel 2011 for Mac, Excel 2010, Excel 2007, Excel 2003, Excel XP, Excel 2000

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)
Result: TRUE

IsNull("Tech on the Net")
Result: 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.