Use the form below to do your conversion.
Solution
Step1
Log21665=Log(665) ÷ Log(21)
Log(665)= 2.8228216453031
Log(21)=1.3222192947339
Log21665=2.8228216453031 ÷ 1.3222192947339
Ans=2.1349118535372
Step2
Alternatively, the logarithm can be calculated like this.