ROUNDDOWN
Supported, behaves as documentedCategory: Math and trigonometry · 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 |
|---|---|---|---|---|
| =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