Use the form below to do your conversion.
Solution
Step1
Log21397=Log(397) ÷ Log(21)
Log(397)= 2.5987905067631
Log(21)=1.3222192947339
Log21397=2.5987905067631 ÷ 1.3222192947339
Ans=1.9654761635331
Step2
Alternatively, the logarithm can be calculated like this.