Use the form below to do your conversion.
Solution
Step1
Log21647=Log(647) ÷ Log(21)
Log(647)= 2.8109042806687
Log(21)=1.3222192947339
Log21647=2.8109042806687 ÷ 1.3222192947339
Ans=2.1258987006647
Step2
Alternatively, the logarithm can be calculated like this.