## Summary

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.

## Purpose

Test if a value is logical

## Return value

A logical value (TRUE or FALSE)

## Syntax

``=ISLOGICAL(value)``
• value - The value to test as logical.

## How to use

The 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.

The ISLOGICAL function takes one argument, value, which can be a cell reference, a formula, or a hardcoded value. When value is TRUE or FALSE, the ISLOGICAL function will return TRUE. If value is any other value, ISLOGICAL will return FALSE.

### Examples

The ISLOGICAL function returns TRUE if value is TRUE or FALSE:

``````=ISLOGICAL(TRUE) // returns TRUE
=ISLOGICAL(FALSE) // returns TRUE
``````

If value is a formula, ISLOGICAL checks the result of the formula:

``````=ISLOGICAL(100>50) // returns TRUE
=ISLOGICAL(2+2) // returns FALSE
=ISLOGICAL(A1=B1) // returns TRUE
``````

Note that 1 and 0 (zero) are not evaluated as TRUE and FALSE.

``````=ISLOGICAL(1) // returns FALSE
=ISLOGICAL(0) // returns FALSE
``````

### Count logicals

To count cells in a range that contain logicals, you can use the SUMPRODUCT function like this:

``````=SUMPRODUCT(--ISLOGICAL(range))
``````

The double negative coerces the TRUE and FALSE results from ISLOGICAL into 1s and 0s and SUMPRODUCT sums the result.

### Notes

• Only the logical values TRUE and FALSE return TRUE Author ### Dave Bruns

Hi - I'm Dave Bruns, and I run Exceljet with my wife, Lisa. Our goal is to help you work faster in Excel. We create short videos, and clear examples of formulas, functions, pivot tables, conditional formatting, and charts.