ReferenceExcel FormulasSupported FormulasISBLANKOn this pageISBLANK The ISBLANK function checks if a value is empty. Syntax =ISBLANK(value) Parameters value: The value to test Examples =ISBLANK("") // Returns TRUE=ISBLANK(" ") // Returns FALSE (contains a space)=ISBLANK(A1) // Returns TRUE if A1 is empty