# ISLOGICAL Function in Excel

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In this tutorial, you will learn the ISLOGICAL excel formula. ISLOGICAL function in excel is useful to evaluate whether a data has logical value or not (TRUE/FALSE) and produce TRUE or FALSE based on the evaluation.

## Why do We Need to Learn ISLOGICAL Excel Formula?

In the data processing on the spreadsheet, sometimes we want to see whether a data, result of a formula, or content of a cell is a logical value or not. This is sometimes needed so we can know whether the data that we check can be processed for the next stage which is correlated with the logical value. If they are not checked, then they can give an error effect to our next processing stage which is what we do not want.

As an example of this checking need, imagine if we check whether our after production products are adequate or not which will impact on whether we will give each of the products code or not because we will only give it to those who are adequate. If we get the data about the adequateness of the products in the form of TRUE or FALSE logic value and we want to give the product codes directly from that data, then maybe it will be better if we check them first especially if the data is sourced externally. It can be that the content of some of those cells is in the text form and this can result in an error during our processing for the product codes. But, of course, it will be very troublesome and take a lot of time if many entries must be checked and we do the checking manually.

If you have a need like in the case and want to do the checking process faster, then you can use ISLOGICAL function in excel. ISLOGICAL excel formula is useful in evaluating a data whether it is a logic value or not fast before it gives TRUE or FALSE based on the evaluation. It is useful to be understood and learned if you often deal with the need like in the given case.

## What is ISLOGICAL Function in Excel?

ISLOGICAL function in excel is a function with the usage objective to evaluate data whether it is a logic value or not and gives TRUE or FALSE based on the evaluation. ISLOGICAL function in excel is one of the IS functions in the spreadsheet besides others like ISNUMBER and ISERROR. Like other IS, it is usually used with IF formula because IF can do further processing based on its result.

Generally, the input of ISLOGICAL excel formula can be explained as follows:

=ISLOGICAL(value)

Note:
value = something that you want to check whether it has a logic value or not

## How to Use ISLOGICAL Excel Formula?

The following will explain the writing of the ISLOGICAL excel formula. ISLOGICAL excel formula is pretty easy to use because it only needs one input which is something that you want to evaluate.

## Using ISLOGICAL Function in Excel

1. Type equal sign ( = ) in the cell where you want to put the result in 2. Type ISLOGICAL (can be with large and small letters) and open bracket sign after = 3. Input the data / the process that produces the data / cell coordinate where it is located after open bracket sign 4. Type close bracket sign 5. Press Enter
6. The process is done! ## Exercise

After you have learned how to use the ISLOGICAL excel formula, now is the time you do the exercise to deepen your understanding.

### Instructions

Answer each question in the gray-colored cells on each appropriate row
1. Is the left cell contains logic? Use TRUE or FALSE to answer!
2. Is the left cell contains logic? Answer with “V” if yes or “X” if not! Use the IF formula to help you!
3. Is the left cell contains logic? Assume that 1 is TRUE and 0 is FALSE. Answer with “Yes” if yes or “No” if no! Use IF to help you here too and see the additional note part of this tutorial as a clue on how to answer the question!

If you want to evaluate 1 and 0 as logics too, then use AND or OR formulas to your data before evaluating them using ISLOGICAL function in excel.