Use the form below to do your conversion.
Solution
Step1
Log218405=Log(8405) ÷ Log(21)
Log(8405)= 3.9245377177755
Log(21)=1.3222192947339
Log218405=3.9245377177755 ÷ 1.3222192947339
Ans=2.968144341416
Step2
Alternatively, the logarithm can be calculated like this.