Use the form below to do your conversion.
Solution
Step1
Log216991=Log(6991) ÷ Log(21)
Log(6991)= 3.844539302129
Log(21)=1.3222192947339
Log216991=3.844539302129 ÷ 1.3222192947339
Ans=2.9076412040279
Step2
Alternatively, the logarithm can be calculated like this.