Use the form below to do your conversion.
Solution
Step1
Log910991=Log(10991) ÷ Log(9)
Log(10991)= 4.041037207867
Log(9)=0.95424250943932
Log910991=4.041037207867 ÷ 0.95424250943932
Ans=4.2348115577469
Step2
Alternatively, the logarithm can be calculated like this.