Use the form below to do your conversion.
Solution
Step1
Log217991=Log(7991) ÷ Log(21)
Log(7991)= 3.9026011306665
Log(21)=1.3222192947339
Log217991=3.9026011306665 ÷ 1.3222192947339
Ans=2.9515536085501
Step2
Alternatively, the logarithm can be calculated like this.