Use the form below to do your conversion.
Solution
Step1
Log21139=Log(139) ÷ Log(21)
Log(139)= 2.1430148002541
Log(21)=1.3222192947339
Log21139=2.1430148002541 ÷ 1.3222192947339
Ans=1.6207710844859
Step2
Alternatively, the logarithm can be calculated like this.