LN

Quirk found

Category: 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)	Quirk found

=LN(0) on LibreOffice Calc returned #VALUE!, but the documented/expected result is #NUM!. Microsoft's LN docs specify the Number argument must be 'the positive real number for which you want the natural logarithm' -- https://support.microsoft.com/en-us/office/ln-function-81fe1ed7-dac9-4acd-ba1d-07a142c6118f -- 0 and negative numbers are outside that domain and both are well-established to raise #NUM!, matching every other Excel logarithm function; MISMATCH vs expected: expected '#NUM!', got '#VALUE!'
=LN(-5) on LibreOffice Calc returned #VALUE!, but the documented/expected result is #NUM!. MISMATCH vs expected: expected '#NUM!', got '#VALUE!'

Formula	Description	Result	Expected	Verdict
=LN(1)	Natural log of 1 is 0	0	0	Matched
=LN(2.718281828459045)	Natural log of e is 1	1	1	Matched
=LN(0)	Zero is outside LN's domain -> #NUM!	#VALUE!	#NUM! Microsoft's LN docs specify the Number argument must be 'the positive real number for which you want the natural logarithm' -- https://support.microsoft.com/en-us/office/ln-function-81fe1ed7-dac9-4acd-ba1d-07a142c6118f -- 0 and negative numbers are outside that domain and both are well-established to raise #NUM!, matching every other Excel logarithm function	Mismatch
=LN(-5)	Negative numbers are outside LN's domain -> #NUM!	#VALUE!	#NUM!	Mismatch