Use the form below to do your conversion.
Solution
Step1
Log21809=Log(809) ÷ Log(21)
Log(809)= 2.9079485216123
Log(21)=1.3222192947339
Log21809=2.9079485216123 ÷ 1.3222192947339
Ans=2.1992936672411
Step2
Alternatively, the logarithm can be calculated like this.