ISBLANK DAX Function (Information)

Checks whether a value is blank, and returns TRUE or FALSE.


ISBLANK ( <Value> )
Parameter Attributes Description

The value you want to test.

Return values

Scalar A single boolean value.

A Boolean value of TRUE if the value is blank; otherwise FALSE.


The comparison with blank is also possible with the “strictly equal to” operator == as shown in the two following correspondent predicates.

ISBLANK ( <expression> )  -- same result as the following line
<expression> == BLANK()   -- same result as the previous line

Related articles

Learn more about ISBLANK in the following articles:

  • How to handle BLANK in DAX measures

    This article describes a counterintuitive behavior of BLANK in DAX measures affecting Power BI, Analysis Services, and Power Pivot. That behavior could cause mistakes in a report using alternate expressions of the same calculation. Indeed, these expressions are not equivalent when BLANK is involved. » Read more

  • Handling BLANK in DAX

    The blank value in DAX is a special value requiring particular attention in comparisons. It is not like the special null value in SQL, and it could appear in any conversion from a table expression. This article explores in details the behavior of the blank value in DAX, highlighting a common error in DAX expressions […] » Read more

  • Check Empty Table Condition with DAX

    In DAX there are different ways to test whether a table is empty. This test can be used in complex DAX expressions and this short article briefly discuss what are the suggested approaches from a performance perspective. » Read more

Related functions

Other related functions are:

Last update: Jul 8, 2020   » Contribute   » Show contributors

Contributors: Alberto Ferrari, Marco Russo

MSDN documentation:

DAX Conventions
Context Transition

This function performs a Context Transition if called in a Row Context. Click to read more.

Row Context

This expression is executed in a Row Context. Click to read more.


Not recommended

The use of this function is not recommended. See Remarks and Related functions for alternatives.

Not recommended

The use of this parameter is not recommended.


This function is deprecated. Jump to the Alternatives section to see the function to use.


This parameter is deprecated and its use is not recommended.


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