ROUNDDOWN
Supported, behaves as documentedCategory: Math and trigonometry · Last tested 2026-08-06
Real, executed compatibility results for the ROUNDDOWN 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) | Supported, behaves as documented |
LibreOffice version history
We executed the same test cases under each LibreOffice release to show exactly when ROUNDDOWN’s support changed — not documentation claims, real results.
| LibreOffice version | Verdict | Tested |
|---|---|---|
| 24.2.0.3 | Supported, behaves as documented | 2026-07-19 |
| 24.8.7.2 | Supported, behaves as documented | 2026-07-19 |
| 25.2.0.3 | Supported, behaves as documented | 2026-07-24 |
| 25.8.7.3 | Supported, behaves as documented | 2026-08-06 |
Executed test cases
LibreOffice Calc 25.8.7.3 (tested 2026-08-06)
| Formula | Description | Result | Expected | Verdict |
|---|---|---|---|---|
| =ROUNDDOWN(3.9,0) | Always rounds toward zero, regardless of the discarded digit | 3 | 3 | Matched |
| =ROUNDDOWN(-3.9,0) | For negative numbers, 'down' means toward zero (less negative), not toward negative infinity | -3 | -3 | Matched |
| =ROUNDDOWN(21.5,-1) | Negative num_digits rounds to the left of the decimal point (nearest multiple of 10 here) | 20 | 20 Rounding 21.5 down (toward zero) to the nearest 10 gives 20 -- this is Microsoft's own documented example for ROUNDDOWN, and the direct counterpart to ROUNDUP(21.5,-1)=30 |
Matched |
| =ROUNDDOWN(3.14159,2) | Rounds down to 2 decimal places, discarding the remaining digits | 3.14 | 3.14 | Matched |
Docs & syntax
- Excel: official documentation
- Google Sheets: official documentation
- LibreOffice Calc: official documentation