ReferenceExcel FormulasSupported FormulasLOG10On this pageLOG10 The LOG10 function returns the base-10 logarithm of a number. Syntax =LOG10(number) Parameters number: The positive real number for which you want the base-10 logarithm Examples =LOG10(100) // Returns 2=LOG10(1000) // Returns 3=LOG10(1) // Returns 0