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FLOOR.MATH

Supported, behaves as documented

Category: Math and trigonometry · Last tested 2026-09-01

Real compatibility results for the FLOOR.MATH function: executed in Excel for the web, Google Sheets and LibreOffice Calc, with desktop Excel behavior from Microsoft’s official documentation (we do not run desktop Excel — Excel for the web is a different application and is executed separately). Syntax and links to that documentation are below.

Support matrix

EngineDocumentedLive-testedVerdict
Excel (desktop)Yes No — documented only n/a
Excel for the web— Yes (recalc, 2026-09-01) Supported, behaves as documented
Google SheetsYes Yes (Drive import, 2026-08-29) Supported, behaves as documented
LibreOffice CalcYes Yes (25.8.7.3, 2026-07-29) 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 versionVerdictTested
24.2.0.3 Supported, behaves as documented 2026-08-29
24.8.7.2 Supported, behaves as documented 2026-08-29
25.2.0.3 Supported, behaves as documented 2026-08-29
25.8.7.3 Supported, behaves as documented 2026-07-29

Executed test cases

Excel for the web (executed 2026-09-01 via OneDrive recalculation)

These values come from Excel for the web, not from desktop Excel. They are two different implementations of the calculation engine, and this run measured only the web one: the corpus was uploaded to OneDrive as .xlsx, recalculated by Excel for the web on open, and downloaded again for readback. Excel for the web is a rolling service with no pinnable version, so the run is identified by its date. Where a value here disagrees with the Expected column — which is Microsoft’s documentation of the desktop product — we cannot tell you whether the web engine diverges from the desktop one or the documentation is wrong about both, because we do not run desktop Excel.

FormulaDescriptionResultExpectedVerdict
=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
Provenance

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
Provenance

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

Google Sheets (executed 2026-08-29 via Drive import)

Google Sheets is a rolling service with no pinnable version, so this run is identified by its date. The corpus was imported to Drive as .xlsx, recalculated by Sheets, and exported back for readback.

FormulaDescriptionResultExpectedVerdict
=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
Provenance

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
Provenance

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

LibreOffice Calc 25.8.7.3 (tested 2026-07-29)

FormulaDescriptionResultExpectedVerdict
=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
Provenance

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
Provenance

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

Where FLOOR.MATH behaves differently