LOG
Quirk foundCategory: Math and trigonometry · Last tested 2026-08-06
Real, executed compatibility results for the LOG function across Microsoft Excel, Google Sheets, and LibreOffice Calc — verified by actually running it. Syntax and links to each vendor’s official documentation are below.
Support matrix
| Engine | Documented | Live-tested | Verdict |
|---|---|---|---|
| Excel | Yes | Not yet | n/a |
| Google Sheets | Yes | Not yet | n/a |
| LibreOffice Calc | Yes | Yes (25.8.7.3, 2026-08-06) | Quirk found |
LibreOffice version history
We executed the same test cases under each LibreOffice release to show exactly when LOG’s support changed — not documentation claims, real results.
| LibreOffice version | Verdict | Tested |
|---|---|---|
| 24.2.0.3 | Quirk found | 2026-07-19 |
| 24.8.7.2 | Quirk found | 2026-07-19 |
| 25.2.0.3 | Quirk found | 2026-07-24 |
| 25.8.7.3 | Quirk found | 2026-08-06 |
Why isn't LOG working in LibreOffice?
LOG exists in LibreOffice 25.8.7.3, but it is not a drop-in match for
Excel — our executed tests found real behavioral differences (detailed in the test results on this
page). If a formula that works in Excel or Google Sheets misbehaves in LibreOffice, compare your usage
against the failing cases above before assuming your data is wrong.
Discovered quirks
- =LOG(0) on LibreOffice Calc returned #VALUE!, but the documented/expected result is #NUM!. MISMATCH vs expected: expected '#NUM!', got '#VALUE!'
- =LOG(-10) on LibreOffice Calc returned #VALUE!, but the documented/expected result is #NUM!. MISMATCH vs expected: expected '#NUM!', got '#VALUE!'
Executed test cases
LibreOffice Calc 25.8.7.3 (tested 2026-08-06)
| Formula | Description | Result | Expected | Verdict |
|---|---|---|---|---|
| =LOG(100) | With base omitted, LOG defaults to base 10 | 2 | 2 Microsoft's LOG docs state 'If base is omitted, it is assumed to be 10' -- https://support.microsoft.com/en-us/office/log-function-4e82f196-1ca9-4747-8fb0-6c4a3abb3280 |
Matched |
| =LOG(8,2) | Explicit base argument: log base 2 of 8 | 3 | 3 This is Microsoft's own documented example: '=LOG(8,2), The result, 3, is the power to which the base must be raised to equal 8' -- https://support.microsoft.com/en-us/office/log-function-4e82f196-1ca9-4747-8fb0-6c4a3abb3280 |
Matched |
| =LOG(0) | Zero is outside LOG's domain -> #NUM! | #VALUE! | #NUM! | Mismatch |
| =LOG(-10) | Negative numbers are outside LOG's domain -> #NUM! | #VALUE! | #NUM! | Mismatch |
Docs & syntax
- Excel: official documentation
- Google Sheets: official documentation
- LibreOffice Calc: official documentation