COUNTBLANK DAX Function (Aggregation)

Counts the number of blanks in a column.


COUNTBLANK ( <ColumnName> )
Parameter Attributes Description

The column containing the blanks to be counted.

Return values

Scalar A single integer value.

If no rows are found that meet the blank condition, the function returns blank.


The function never returns 0. If there are no rows or no blanks, it returns always blank.

Any empty string is considered as a blank for COUNTBLANK purposes, even though ISBLANK would return FALSE for an empty string.

Even though COUNTBLANK is semantically equivalent to the following expressions, it may be slower than corresponding syntax based on CALCULATE.

-- Example of COUNTBLANK over a column
COUNTBLANK ( 'Table'[Column] )

-- Semantically equivalent expression that can be faster (only for columns that are not strings):
    COUNTROWS ( 'Table' ),
    KEEPFILTERS ( ISBLANK ( 'Table'[Column] ) )

-- Semantically equivalent expression that can be faster (only for columns that are strings):
    COUNTROWS ( 'Table' ), 
    KEEPFILTERS ( 'Table'[Value] = "" ) 

Related functions

Other related functions are:

Last update: Nov 21, 2020   » Contribute   » Show contributors

Contributors: Alberto Ferrari, Marco Russo

MSDN documentation:

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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.

DirectQuery compatibility

Limitations are placed on DAX expressions allowed in measures and calculated columns.
The state below shows the DirectQuery compatibility of the DAX function.


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