Use the form below to do your conversion.
Solution
Step1
Log217681=Log(7681) ÷ Log(21)
Log(7681)= 3.8854177651109
Log(21)=1.3222192947339
Log217681=3.8854177651109 ÷ 1.3222192947339
Ans=2.9385577570874
Step2
Alternatively, the logarithm can be calculated like this.