Use the form below to do your conversion.
Solution
Step1
Log215705=Log(5705) ÷ Log(21)
Log(5705)= 3.7562556487542
Log(21)=1.3222192947339
Log215705=3.7562556487542 ÷ 1.3222192947339
Ans=2.840871906585
Step2
Alternatively, the logarithm can be calculated like this.