Use the form below to do your conversion.
Solution
Step1
Log211981=Log(1981) ÷ Log(21)
Log(1981)= 3.2968844755385
Log(21)=1.3222192947339
Log211981=3.2968844755385 ÷ 1.3222192947339
Ans=2.4934475609827
Step2
Alternatively, the logarithm can be calculated like this.