Use the form below to do your conversion.
Solution
Step1
Log217841=Log(7841) ÷ Log(21)
Log(7841)= 3.8943714538562
Log(21)=1.3222192947339
Log217841=3.8943714538562 ÷ 1.3222192947339
Ans=2.9453294694508
Step2
Alternatively, the logarithm can be calculated like this.