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In this article
ISLOGICAL checks whether a value is a real TRUE/FALSE. Imports often bring the text “TRUE”, which looks identical but is not.
Syntax
=ISLOGICAL(value)| Argument | What it means |
|---|---|
value |
Anything. |
Examples
Example 1
=ISLOGICAL(B2)FALSE for the text “TRUE” from a CSV.
ISLOGICAL in practice
Where you will use it
- Validate TRUE/FALSE inputs
- Check checkbox cells
- Data-quality checks
Worked example
| Value | Formula | Result |
|---|---|---|
| TRUE | =ISLOGICAL(A2) | TRUE |
| TRUE | =ISLOGICAL(A3) | FALSE |
| 1 | =ISLOGICAL(A4) | FALSE |
Results calculated in Excel.
Mistakes people make
| Mistake | What to do instead |
|---|---|
| Text 'TRUE' | Text is not logical |
| 1 and 0 | Numbers are not logical either |
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📎 Practice files for this article
- 📗Practice workbook: Information (IS…) functions15 tasks on realistic sales data — type your formula, the Check column turns green when it is right. Answers sheet included.⬇ XLSX · 34 KB
Free to use for learning. Files with macros (.bas) are plain text — import them with Alt+F11 → File → Import File, and always test on a copy.
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