Use the form below to do your conversion.
Solution
Step1
Log201991=Log(1991) ÷ Log(20)
Log(1991)= 3.2990712600274
Log(20)=1.301029995664
Log201991=3.2990712600274 ÷ 1.301029995664
Ans=2.5357380467956
Step2
Alternatively, the logarithm can be calculated like this.