Use the form below to do your conversion.
Solution
Step1
Log21815=Log(815) ÷ Log(21)
Log(815)= 2.91115760874
Log(21)=1.3222192947339
Log21815=2.91115760874 ÷ 1.3222192947339
Ans=2.2017207132995
Step2
Alternatively, the logarithm can be calculated like this.