ISLOGICAL Google Sheet Formula

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ISLOGICAL Formula Syntax

=ISLOGICAL(TRUE)

Example Use Case

Checking if a value is a logical value (TRUE or FALSE)

Understanding the ISLOGICAL Formula

The ISLOGICAL function in Excel checks whether a value is a logical value (TRUE or FALSE), returning TRUE if it is and FALSE if it's not. It's a data type validation tool for formula logic—like ensuring inputs to logical operations are actually boolean values.

ISLOGICAL(TRUE) returns TRUE because TRUE is a logical value. It takes a single value argument and performs a boolean type check—useful for validating inputs to complex formulas or determining how to process data based on its type.

Why Use ISLOGICAL?

ISLOGICAL enables boolean detection—think data validation or conditional processing. Its ability to identify TRUE/FALSE values specifically helps create robust formulas that can adapt their behavior based on input types, avoiding errors when expecting logical values.

Example with Sample Data

Value	Formula	Result
TRUE	=ISLOGICAL(TRUE)	TRUE
FALSE	=ISLOGICAL(FALSE)	TRUE
"TRUE" (text)	=ISLOGICAL("TRUE")	FALSE
1 (number)	=ISLOGICAL(1)	FALSE

ISLOGICAL identifies boolean values: TRUE for TRUE or FALSE values, FALSE for all other data types including numbers, text, or errors. It's a logical value detector.