Common questions about ISLOGICAL usually focus on argument types, result interpretation, and batch use; this FAQ includes 3 common questions and a 3-term glossary.
FAQ
Does ISLOGICAL returning FALSE mean the formula failed?
- Check whether the argument itself is a logical value such as TRUE or FALSE.
- If the argument is a number, text, blank, or another non-logical result, FALSE is a normal return value.
- If needed, combine it with other functions to inspect the value further.
What should I do if the ISLOGICAL result is not what I expected?
- Check whether the referenced cell really contains a logical value.
- Confirm that the formula spelling is correct and starts with
=. - If ISLOGICAL is nested inside another formula, test the inner formula step by step.
How can I use ISLOGICAL in multiple cells at once?
- Enter the ISLOGICAL formula in the first target cell.
- Move the pointer to the fill handle at the lower-right corner of the cell.
- Drag down or copy and paste the formula into other cells.
Glossary
| Term | Definition |
|---|---|
| ISLOGICAL | A function that checks whether a value is a logical value and returns TRUE or FALSE. |
| Logical value | A Boolean result such as TRUE or FALSE. |
| Formula bar | The input area above the worksheet where you can enter or edit formulas. |