Use the form below to do your conversion.
Solution
Step1
Log211991=Log(1991) ÷ Log(21)
Log(1991)= 3.2990712600274
Log(21)=1.3222192947339
Log211991=3.2990712600274 ÷ 1.3222192947339
Ans=2.4951014352663
Step2
Alternatively, the logarithm can be calculated like this.