Use the form below to do your conversion.
Solution
Step1
Log219931=Log(9931) ÷ Log(21)
Log(9931)= 3.9969929818907
Log(21)=1.3222192947339
Log219931=3.9969929818907 ÷ 1.3222192947339
Ans=3.0229425616536
Step2
Alternatively, the logarithm can be calculated like this.