Use the form below to do your conversion.
Solution
Step1
Log217805=Log(7805) ÷ Log(21)
Log(7805)= 3.8923729073984
Log(21)=1.3222192947339
Log217805=3.8923729073984 ÷ 1.3222192947339
Ans=2.9438179603798
Step2
Alternatively, the logarithm can be calculated like this.