Use the form below to do your conversion.
Solution
Step1
Log21389=Log(389) ÷ Log(21)
Log(389)= 2.5899496013257
Log(21)=1.3222192947339
Log21389=2.5899496013257 ÷ 1.3222192947339
Ans=1.9587897496587
Step2
Alternatively, the logarithm can be calculated like this.