Use the form below to do your conversion.
Solution
Step1
Log151991=Log(1991) ÷ Log(15)
Log(1991)= 3.2990712600274
Log(15)=1.1760912590557
Log151991=3.2990712600274 ÷ 1.1760912590557
Ans=2.8051150237069
Step2
Alternatively, the logarithm can be calculated like this.