ISNUMBER DAX Function (Information)

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

Syntax

ISNUMBER ( <Value> )
Parameter Attributes Description
Value

The value you want to test.

Return values

Scalar A single boolean value.

TRUE if the value is numeric; otherwise FALSE.

Remarks

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

» 3 related functions

Examples

--  ISLOGICAL, ISTEXT, ISNONTEXT and ISNUMBER check their argument 
--  for the required data type.
--
--  Different results with strings, numbers, booleans, BLANK
EVALUATE
VAR ValueToCheck = "SQLBI"
RETURN
{
    ( "ISLOGICAL (" & ValueToCheck & ")" , ISLOGICAL ( ValueToCheck )),
    ( "ISTEXT    (" & ValueToCheck & ")" , ISTEXT    ( ValueToCheck )),
    ( "ISNONTEXT (" & ValueToCheck & ")" , ISNONTEXT ( ValueToCheck )),
    ( "ISNUMBER  (" & ValueToCheck & ")" , ISNUMBER  ( ValueToCheck ))
}

Value1 Value2
ISLOGICAL (SQLBI) false
ISTEXT (SQLBI) true
ISNONTEXT (SQLBI) false
ISNUMBER (SQLBI) false
--  When you pass a column as the argument, these functions
--  check the metadata of the column, not the specific 
--  content of the column in the current row
EVALUATE
VAR A = DATATABLE ( 
    "S", STRING, 
    "I", INTEGER,
    { 
        { "A", 1 },     -- "A" is a string
        { "B", 2 },     -- "B" is a string
        { "1", 1 }      -- "1" is considered a string, even though it contains a number
    }
)
VAR ValueToCheck = "SQLBI"
RETURN
{
     ( "ISTEXT(S)",   COUNTROWS ( FILTER ( A, ISTEXT   ( [S] ) ) ) ),
     ( "ISNUMBER(S)", COUNTROWS ( FILTER ( A, ISNUMBER ( [S] ) ) ) ),
     ( "ISTEXT(I)",   COUNTROWS ( FILTER ( A, ISTEXT   ( [I] ) ) ) ),
     ( "ISNUMBER(I)", COUNTROWS ( FILTER ( A, ISNUMBER ( [I] ) ) ) )
}
Value1 Value2
ISTEXT(S) 3
ISNUMBER(S) (Blank)
ISTEXT(I) (Blank)
ISNUMBER(I) 3

Related functions

Other related functions are:

Last update: Jun 13, 2021   » Contribute   » Show contributors

Contributors: Alberto Ferrari, Marco Russo

Microsoft documentation: https://docs.microsoft.com/en-us/dax/isnumber-function-dax

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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.

Iterator

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.

Deprecated

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

Deprecated

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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