Use the form below to do your conversion.
Solution
Step1
Log21905=Log(905) ÷ Log(21)
Log(905)= 2.9566485792052
Log(21)=1.3222192947339
Log21905=2.9566485792052 ÷ 1.3222192947339
Ans=2.2361257251205
Step2
Alternatively, the logarithm can be calculated like this.