Use the form below to do your conversion.
Solution
Step1
Log21643=Log(643) ÷ Log(21)
Log(643)= 2.8082109729242
Log(21)=1.3222192947339
Log21643=2.8082109729242 ÷ 1.3222192947339
Ans=2.1238617407178
Step2
Alternatively, the logarithm can be calculated like this.