Use the form below to do your conversion.
Solution
Step1
Log71991=Log(1991) ÷ Log(7)
Log(1991)= 3.2990712600274
Log(7)=0.84509804001426
Log71991=3.2990712600274 ÷ 0.84509804001426
Ans=3.9037734130489
Step2
Alternatively, the logarithm can be calculated like this.