Use the form below to do your conversion.
Solution
Step1
Log219971=Log(9971) ÷ Log(21)
Log(9971)= 3.9987387162558
Log(21)=1.3222192947339
Log219971=3.9987387162558 ÷ 1.3222192947339
Ans=3.0242628678781
Step2
Alternatively, the logarithm can be calculated like this.