The Excel ISLOGICAL function returns TRUE when a cell contains the logical values TRUE or FALSE, and returns FALSE for cells that contain any other value, including empty cells.

**Syntax**:= ISLOGICAL (value)

The ISLOGICAL function syntax has the following arguments:

**Value**(required argument) – This is the value we wish to test as logical or not. Value can be a blank (empty cell), error, logical, text, number, or reference value, or a name referring to any of these, that we want to test.

**Example**: Let’s look at some Excel ISLOGICAL function examples and explore how to use the ISLOGICAL function as a worksheet function in Microsoft Excel:

**Syntax**: =ISLOGICAL(A2)

**Result**:

Based on the Excel spreadsheet above, the following ISLOGICAL examples would return:

**Syntax**: =ISLOGICAL(A3)**Result**: FALSE

**Syntax**: =ISLOGICAL(A4)**Result**: FALSE

**Syntax**: =ISLOGICAL(A5)**Result**:TRUE

**Syntax**: =ISLOGICAL(A6)**Result**: TRUE

**Syntax**: =ISLOGICAL(A7)**Result**: FALSE

**Syntax**: =ISLOGICAL(A8)**Result**: FALSE

**Syntax**: =ISLOGICAL(A9)**Result**: FALSE

**Syntax**: =ISLOGICAL(A10)**Result**: FALSE

**Syntax**: =ISLOGICAL(A11)**Result**: FALSE

**Note**:

Use the ISLOGICAL function to check if a value is logical. ISLOGICAL will return TRUE when a value is TRUE or FALSE.

For example, =ISERROR(A1) will return TRUE if A1 contains either TRUE or FALSE.

Note that 1 and 0 (zero) are not evaluated as TRUE and FALSE. However, you can use the AND function to evaluate 1 and 0 and TRUE and FALSE.

Normally, **value** is supplied as a cell address.

ISLOGICAL is part of a group of functions called the IS functions, which are often used to test the result of formulas for errors.