Use the form below to do your conversion.
Solution
Step1
Log20991=Log(991) ÷ Log(20)
Log(991)= 2.9960736544853
Log(20)=1.301029995664
Log20991=2.9960736544853 ÷ 1.301029995664
Ans=2.3028474858154
Step2
Alternatively, the logarithm can be calculated like this.