Use the form below to do your conversion.
Solution
Step1
Log215105=Log(5105) ÷ Log(21)
Log(5105)= 3.7079957464229
Log(21)=1.3222192947339
Log215105=3.7079957464229 ÷ 1.3222192947339
Ans=2.8043727399766
Step2
Alternatively, the logarithm can be calculated like this.