Use the form below to do your conversion.
Solution
Step1
Log1991=Log(91) ÷ Log(19)
Log(91)= 1.9590413923211
Log(19)=1.2787536009528
Log1991=1.9590413923211 ÷ 1.2787536009528
Ans=1.5319928646624
Step2
Alternatively, the logarithm can be calculated like this.