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Applies to: 
Calculated column
Calculated table
Measure
Visual calculation
Checks whether a value is a floating-point number, and returns TRUE or FALSE.
Syntax
ISDOUBLE(<value>)
Parameters
| Term | Definition |
|---|---|
value |
The value you want to test. |
Return value
TRUE if the value is a floating-point number; otherwise FALSE.
Remarks
This function is not supported for use in DirectQuery mode when used in calculated columns or row-level security (RLS) rules.
Example
The following DAX query shows the behavior of ISDOUBLE.
EVALUATE
{
IF ( ISDOUBLE ( 4.2 ), "Is double", "Is not double" ), // RETURNS: Is double
IF ( ISDOUBLE ( 3.1E-1 ), "Is double", "Is not double" ), // RETURNS: Is double
IF ( ISDOUBLE ( "42" ), "Is double", "Is not double" ), // RETURNS: Is not double
IF ( ISDOUBLE ( 42 ), "Is double", "Is not double" ), // RETURNS: Is not double
}