To begin with, let’s define ISLOGICAL, a highly useful excel formula. ISLOGICAL is an Excel function that checks if a cell contains a logical value (TRUE or FALSE).


The main purpose of the ISLOGICAL function is to verify if the result of a cell or formula is logical. It aids in understanding the type of data you are working with, ensuring the accuracy of further analysis or calculation.


The syntax for the ISLOGICAL function is pretty straightforward:



The ISLOGICAL formula has only one parameter, ‘value’. This ‘value’ can be a cell reference, a formula, or an expression you wish to check.


ISLOGICAL will return TRUE if ‘value’ is either TRUE or FALSE. For any other value, it will return FALSE.

Usage notes

When using ISLOGICAL, remember that it only considers TRUE or FALSE as logical values. Other numbers or text, even if interpreted as logical in other contexts, will not be considered logical by this function.


ISLOGICAL is readily available in all versions of Excel, making it a universal formula for Excel users.

Example #1

Let’s take a few examples to understand the application of ISLOGICAL better. In our first example, suppose cell A1 contains TRUE. The ISLOGICAL function to check A1 would be:


This will return TRUE because A1 contains a logical value.

Example #2

In the second example, assume cell B2 contains the number 10. If we use the ISLOGICAL function:


It will return FALSE because B2 does not contain a logical value.

Example #3

In the third example, consider cell C3 contains the text “TRUE”. The ISLOGICAL function:


Would return FALSE because ISLOGICAL only recognizes logical values, not text, even if it represents a logical value.

Example #4

In the fourth example, let’s use the IF function in combination with ISLOGICAL to provide custom messages. If D4 contains a logical value, we want Excel to display “Logical value,” and if not, “Non-logical value.” The formula would be:

=IF(ISLOGICAL(D4), "Logical value", "Non-logical value")

 Tips and tricks

Maximize the use of ISLOGICAL by combining it with other functions like IF and SUMPRODUCT to create more complex formulas.


Understand that ISLOGICAL only considers TRUE and FALSE as logical values. Other values, even if they can be interpreted as logical in other contexts, will not be seen as logical by this function.

Common errors and solutions

A common error when using ISLOGICAL is misunderstanding the type of values it considers logical. ISLOGICAL only considers TRUE or FALSE as logical values.

Best Practices

For best practices, always remember to combine ISLOGICAL with other Excel functions to create more advanced formulas.

List of Related functions

Some related functions include ISNUMBER, ISNONTEXT, ISTEXT, ISERR, ISERROR, ISNA, and ISBLANK.

Frequently Used with the formulas

ISLOGICAL is frequently used with formulas like IF and SUMPRODUCT to create more comprehensive and complex formulas.

Frequently Asked Questions

Q. Can ISLOGICAL check multiple cells at once?

Yes, you can use ISLOGICAL with SUMPRODUCT to check multiple cells at once.

Q. Does ISLOGICAL recognize the text “TRUE” or “FALSE” as logical values?

No, ISLOGICAL only recognizes TRUE and FALSE as logical values, not the text “TRUE” or “FALSE”.

Q. How can I count the number of logical values in a range using ISLOGICAL?

You can combine ISLOGICAL with SUMPRODUCT to count the number of logical values in a range.

By understanding and applying the ISLOGICAL function, you will be better equipped to analyze your data more effectively in Excel.