FLOOR.MATH
Supported, behaves as documentedCategory: Math and trigonometry · Last tested 2026-08-06
Real, executed compatibility results for the FLOOR.MATH 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 | No | 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 FLOOR.MATH’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 |
|---|---|---|---|---|
| =FLOOR.MATH(24.3,5) | Rounds 24.3 down to the nearest multiple of 5. Source: https://support.microsoft.com/en-us/office/floor-math-function-c302b599-fbdb-4177-ba19-2c2b1249a2f5 (worked example table) | 20 | 20 | Matched |
| =FLOOR.MATH(6.7) | Significance and mode both omitted -> defaults to nearest integer (significance 1). Source: Microsoft FLOOR.MATH docs. | 6 | 6 | Matched |
| =FLOOR.MATH(-8.1,2) | Negative number, mode omitted -> FLOOR.MATH's default for negative numbers rounds AWAY from zero (opposite default direction from CEILING.MATH's toward-zero default). | -10 | -10 Microsoft worked example: FLOOR.MATH(-8.1,2) = -10 ('rounds -8.1 down (away from 0) to the nearest integer that is a multiple of 2'). Note this default is the mirror image of CEILING.MATH's default (toward zero) for the same-shaped call. |
Matched |
| =FLOOR.MATH(-5.5,2,-1) | Negative number with a nonzero mode argument -> reverses the default to round toward zero instead of away from zero. | -4 | -4 Microsoft worked example: FLOOR.MATH(-5.5,2,-1) = -4 ('rounds -5.5 toward 0 ... using a non-zero Mode, which reverses rounding direction'). |
Matched |
Docs & syntax
- Excel: official documentation
- Google Sheets: official documentation