Use the form below to do your conversion.
Solution
Step1
Log78405=Log(8405) ÷ Log(7)
Log(8405)= 3.9245377177755
Log(7)=0.84509804001426
Log78405=3.9245377177755 ÷ 0.84509804001426
Ans=4.6438845340468
Step2
Alternatively, the logarithm can be calculated like this.