Use the form below to do your conversion.
Solution
Step1
Log51991=Log(1991) ÷ Log(5)
Log(1991)= 3.2990712600274
Log(5)=0.69897000433602
Log51991=3.2990712600274 ÷ 0.69897000433602
Ans=4.7199039151349
Step2
Alternatively, the logarithm can be calculated like this.