Use the form below to do your conversion.
Solution
Step1
Log213985=Log(3985) ÷ Log(21)
Log(3985)= 3.6004283257321
Log(21)=1.3222192947339
Log213985=3.6004283257321 ÷ 1.3222192947339
Ans=2.7230190484073
Step2
Alternatively, the logarithm can be calculated like this.