Use the form below to do your conversion.
Solution
Step1
Log1391=Log(91) ÷ Log(13)
Log(91)= 1.9590413923211
Log(13)=1.1139433523068
Log1391=1.9590413923211 ÷ 1.1139433523068
Ans=1.7586544129593
Step2
Alternatively, the logarithm can be calculated like this.