How to use the Excel ISLOGICAL function

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)

Arguments

value - The value to test as logical.

Version

Excel 2003

Usage notes

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

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Excel ISLOGICAL Function

Examples

Count logicals

Notes

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