Use the form below to do your conversion.
Solution
Step1
Log218515=Log(8515) ÷ Log(21)
Log(8515)= 3.9301846522986
Log(21)=1.3222192947339
Log218515=3.9301846522986 ÷ 1.3222192947339
Ans=2.9724151416876
Step2
Alternatively, the logarithm can be calculated like this.