ISNUMBER DAX Function (Information)

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


ISNUMBER ( <Value> )
Parameter Attributes Description

The value you want to test.

Return values

Scalar A single boolean value.

TRUE if the value is numeric; otherwise FALSE.


When applied to a column reference as expression, this functions tests the data type of the column, returning TRUE whether the column is of any numeric data type (Currency, DateTime, Decimal, Integer) and FALSE for any other data type.
The value in the expression is irrelevant: infinity, negative infinity, and NaN all count as numbers.

IMPORTANT: This function does not test whether a string can be converted to a number.

» 3 related functions


--  ISLOGICAL, ISTEXT, ISNONTEXT and ISNUMBER check their argument 
--  for the required data type.
--  Different results with strings, numbers, Booleans, and BLANK
VAR _Logical = TRUE
VAR Number  = -1.2
VAR Txt     = "SQLBI"
VAR ValueTable =
        ( "ISLOGICAL(Value)", ISLOGICAL ( _Logical ), ISLOGICAL ( Number ), ISLOGICAL ( Txt ), ISLOGICAL ( BLANK () ) ),
        ( "ISNUMBER (Value)", ISNUMBER ( _Logical ), ISNUMBER ( Number ), ISNUMBER ( Txt ), ISNUMBER ( BLANK () ) ),
        ( "ISTEXT(Value)", ISTEXT ( _Logical ), ISTEXT ( Number ), ISTEXT ( Txt ), ISTEXT ( BLANK () ) ),
        ( "ISNONTEXT(Value)", ISNONTEXT ( _Logical ), ISNONTEXT ( Number ), ISNONTEXT ( Txt ), ISNONTEXT ( BLANK () ) )
        "Function Call      VALUE = ",[Value1],
        "TRUE",       [Value2],
        "-1.2",       [Value3],
        """SQLBI""",  [Value4],
        "BLANK()",    [Value5]
Function Call      VALUE = TRUE -1.2 “SQLBI” BLANK()
ISLOGICAL(Value) true false false false
ISNUMBER (Value) false true false false
ISTEXT(Value) false false true false
ISNONTEXT(Value) true true false true
--  ISLOGICAL, ISTEXT, ISNONTEXT and ISNUMBER check their argument 
--  for the required data type.
--  Different results with strings, numbers, booleans, BLANK
VAR ValueToCheck = "SQLBI"
    ( "ISLOGICAL (" & ValueToCheck & ")" , ISLOGICAL ( ValueToCheck )),
    ( "ISTEXT    (" & ValueToCheck & ")" , ISTEXT    ( ValueToCheck )),
    ( "ISNONTEXT (" & ValueToCheck & ")" , ISNONTEXT ( ValueToCheck )),
    ( "ISNUMBER  (" & ValueToCheck & ")" , ISNUMBER  ( ValueToCheck ))

Value1 Value2

Related functions

Other related functions are:

Last update: Jun 13, 2024   » Contribute   » Show contributors

Contributors: Alberto Ferrari, Marco Russo, Kenneth Barber,

Microsoft 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.


A volatile function may return a different result every time you call it, even if you provide the same arguments. Click to read more.


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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