ReferenceExcel FormulasSupported FormulasLNOn this pageLN The LN function returns the natural logarithm of a number. Syntax =LN(number) Parameters number: The positive number for which you want the natural logarithm Examples =LN(2.718282) // Returns 1 (approximately)=LN(1) // Returns 0=LN(EXP(5)) // Returns 5