Use the form below to do your conversion.
Solution
Step1
Log21109=Log(109) ÷ Log(21)
Log(109)= 2.0374264979406
Log(21)=1.3222192947339
Log21109=2.0374264979406 ÷ 1.3222192947339
Ans=1.5409142084488
Step2
Alternatively, the logarithm can be calculated like this.