ISBLANK
Supported, behaves as documentedCategory: Information · Last tested 2026-07-04
Support matrix
| Engine | Documented | Live-tested | Verdict |
|---|---|---|---|
| Excel | Yes | Not yet | n/a |
| Google Sheets | Yes | Not yet | n/a |
| LibreOffice Calc | Yes | Yes (24.2.7.2, 2026-07-04) | Supported, behaves as documented |
Executed test cases
LibreOffice Calc 24.2.7.2 (tested 2026-07-04)
| Formula | Description | Result | Expected | Verdict |
|---|---|---|---|---|
| =ISBLANK(A1) | A1 is never written to at all (no setup_cells entry) -- a genuinely empty cell | True | True | Matched |
| =ISBLANK(A1) | A1 contains the formula ="" which displays as nothing but is NOT considered blank -- a classic documented divergence between 'looks empty' and 'is blank'. Verified via https://support.microsoft.com/en-us/help/823838/the-result-is-false-when-you-use-the-isblank-function-in-an-excel-spre ("the result is FALSE even though the cell appears to be empty ... when the cell contains a zero-length string") | False | False A1 displays as blank but holds a zero-length-string formula result, not a true blank -- ISBLANK must return FALSE |
Matched |
| =ISBLANK(A1) | A1 explicitly contains the value 0 -- clearly not blank | False | False | Matched |
Docs & syntax
- Excel: official documentation
- Google Sheets: official documentation
- LibreOffice Calc: official documentation