Use the form below to do your conversion.
Solution
Step1
Log21409=Log(409) ÷ Log(21)
Log(409)= 2.6117233080073
Log(21)=1.3222192947339
Log21409=2.6117233080073 ÷ 1.3222192947339
Ans=1.9752572953739
Step2
Alternatively, the logarithm can be calculated like this.